Installing Headlight Relays on a 1st Gen Cummins
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- เผยแพร่เมื่อ 12 ก.ค. 2024
- Headlight Relays: Headlight relay harness - www.lmctruck.com/1972-93-dodg...
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Make sure to check out these headlights if you feel like your headlights are not very good. They are amazing and only cost $85: amzn.to/2ToYniy
I was wondering will this fix the lights from getting bright and dim bright and dim all the time.
@@dannypaulross9654 Give me some more info on this question. What you are describing sounds like the grid heaters cycling which is completely normal. This will help buffer some from that though as well
@@decentgarage I'm not to sure about that because it does it all the time. It can be 85/90 degrees at night and the truck at normal running pimps an it'll do it. In the winter when you first crank it yes it will do what you are talking about but you can hear the heater coming on and off. Also the heater is a steady thing for a few minutes depending on how cold it is. What I am talking about mine and my dad's 93s and my friends 96 all do it. There is no pattern or nothing. Dosen't matter what the road is like or anything. The lights just constantly go from bright to dim and somewhere in between. It doesn't matter if they are on bright or dim and the dashboard lights do the same.
Best Mod ever. Have done this to my 1st Gen and my 1968 Mustang. Not having the power go through the old switch and wiring and suffering the voltage drop easily makes the lights twice as bright.
I'll be referencing your videos when I finally get around to rewiring my junk. Awesome content for the 1st gen community; almost to 500 subs!
Yeah we're almost there! Glad to hear the videos are helpful.
Getting closer to 500 subscribers! Great video, and keep up the great content
Yep! We're almost there! Thanks for the support!
I wish I had a Cummins, but I'm glad I came across your channel,( I subbed).
I am an '83 D150, slant 6 owner, and this info is VERY helpful when it comes to old Mopar wiring!
I ordered this relay harness kit after watching your video, just got around to installing it today and it fixed my turn signal issue I was having.
Thanks for the great content !!
Awesome! Glad it helped!
Same!
Thank you. You did a great job on hitting all points.
Great vid . I've replaced 2 or 3 melted headlight switches in my 93 thanks for the link
No problem! That should fix your issues
Wow they look amazing they sure light it up.
I'm super impressed with them for the price!
Super helpful man thank you. Solved a flickering light issue i was having after replacing the alternator, adding an external regulator, and replacing the switch. This is what finally solved it
Thanks Tony! Yeah I'm in Utah
Awesome! It's such a simple and cheap modification thay goes a long way.
Very useful and informative, as well as essential for the 1st Gens. I wish they had these kits years ago, as I just wired in two Bosch relays along the harness just after the fusible links. Still works great to this day, and no more melted switches! I'm no electrical engineer, but I believe that just going to the LED headlights takes a significant load off the switch, even without a relay. I'm thinking that's why your lights looked to be the same brightness before and after. Running OEM lights pulls a lot of juice, and I did notice a dramatic improvement to those lights when I installed the relays. In any case, I think relays are a must for efficiency of the lights, as well as safety and longevity of the switch.
Yeah I don't think relays are as big of a deal with LED headlights but I don't think it hurts either.
LMC truck is very reasonable with their prices, I cannot recommend them enough complete fix for that over heated headlight switch. Thanks for this video, and thank you for all your very well done videos. GREAT STUFF
Bam ! Bam!
Been looking for 8onths on how to resolve this fire hazard.
Thank U!
MOEcAA$h Trucker .
Hey man, I was the guy who commented on the led headlight install video. Thank you so much for making this video, it was super helpful and I really appreciate that you showed every step of the process. Looking forward to more videos to come 👍
Does your truck have daytime running lights? It's says on the website that the kit can't be used with daytime running lights.
My truck does not have daytime running lights. The only 1st gens that came with daytime running lights were those sold in canada. So if your speedometer is in MPH you should be good but if it's in KPH you likely have daytime running lights.
@@decentgarage Well shucks man, I'm from Canada. Lol. What am I to do now 🤔
@@lowest.tier.garage shoot, you stumped me!
@@decentgarage Dang man, I guess I'll look into and figure it out. I don't understand how this harness would not work with daytime running lights though 🤔
Hey guy I really like your truck and I like what you do you’re a video on the governor spring was very informative and I definitely want to get that done to my truck on the relays for the headlights I did the same thing with my truck only one thing I did differently I changed my plugs to the headlights itself which are Hella headlights and anyways the little ground wire that came off those headlights was just something almost make you wanna vomit it was a between a 14 and a 16 well now I got out of 14 on one side and double 14 on the other my headlight plugs came off at 63 Chrysler wiring harness and yes it made a big difference but I did put the relays out where I had with Sauter everything together and stuff like that that was years ago
Nice work jim!
you are correct on headlight switch. i have been working on my own and when i got to that area, could not believe this did not catch fire. big hot wires just laying on top of switch. still wonder why it did not burn down. the whole switch center was missing.
coming in clutch again - bought this off LMC and took max 5-10 min to put on
Glad it was helpful! Did you notice any difference in the brightness of the lights?
@@decentgarage my lights didnt even work with LEDs so wasnt good comparison. just work or not work.
I would like to offer a suggestion with this installation. First, I agree with your decision to install this aftermarket wiring harness. It is very simple to install and it removes a troublesome current load off your headlight switch. Before my install, I had the unfortunate experience of the switch starting to melt down on the highway at night. Not a fun experience. My suggested upgrade is with the relays that come with the harness. They are 4-pin relays which are not common, nor easy to find in the US. I had one of them burn out on me and it took a very long time with plenty of research to locate one. After this experience, I decided to employ a better and more reliable fix by cutting the 4-pin relay and socket out of the harness and replacing it with the more common 5- pin Bosch-style relay and socket. You will need to troubleshoot which wires in the harness go to which pins in the 4-pin relay and then translate that into the 5 pin relay, but it is not that difficult to do as diagrams are easy to find. One of the pins in the 5-pin socket will not be used. 5-pin relays and their socket pigtails are readily available at most auto part stores and are very inexpensive by comparison. The 4 pin relay was ~$40.00 or so and the 5 pin with a similar rating is ~$5.00. You can run with the 4-pin relay until it burns out, or avoid the anxiety and frustration of trying to find one late at night and away from home and just take the time to remove the 4-pin and swap in a 5-pin now while it is convenient. This is not a difficult task, just a bit time consuming to make sure you wire in the new socket correctly.
Good thought. You can also just use a 5 pin relay and not connect anything to the 5th wire
@@decentgarage Sorry, I guess my suggestion was a bit cloudy. The wire harness has a 4 pin relay and socket that cannot be used with a 5 pin relay. Replacing the 4 pin socket with a 5 pin socket is what I did. You are right, the 5th pin on the relay and corresponding socket will not be used. I just taped it off.
As everybody is saying, great mod! I made my own harness years ago and can still remember the difference it made. I've often thought I should make and sell a harness. Ah well I'm lazy. Glad they came up with one.
Next best thing to that is the blower motor high speed mod. I saw a write-up somewhere online on how to do it but it seems they over complicated it. I wound up using a add-on circuit from Painless that's actually for an electric engine fan. It's pretty near plug and play and makes a huge difference.
Yeah it's so nice that they have a kit now. Wiring is not my forte
Yeah Jim Lane did a writeup on that years ago. I haven't done it yet. What did you notice when you did your version of it?
It has been so long since I've read the write up. I had it saved for a long time before even looking into it. Seems like initially he had an issue with back feeding the blower and it would stay running? Honestly I don't remember well enough to be able to make a comparison but when I moved my HVAC controls down to the radios position, I figured now's the time. I had the relay kit from Painless left over from another project and just incorporated it into it. It made it nearly plug-and-play. Mounted the relay to the bracing behind the inst cluster, the kit uses a maxi fuse (can't remember the amps) which I feel is WAY overkill and then used hi speed switch position to trigger it and used the existing hi speed wire (to resistor) connected to the 87 pin. Here in southeast Texas, a/c is a BIG deal. At that point, I'd fully been over and "hopped up" the system as good as I knew how. Only thing left was the weak blower speed to cool it down after the trucks sat all day and this did the trick. I'd say the ac in this truck is just as good as our '17 Expedition now.. just louder when on high.
@@txmuddigger I'm going to look in to this for sure. My ac is plenty cold but the blower speed just doesnt put out enough when it's above 85. Especially with black leather seats
Yeah I just made the comment before about the hell I headlights I also Y had a problem with my headlight switch and anyways I was lucky I bought a donor truck so I could change my cab and it was a 1986 and only have 56,000 miles on it while I stole dad headlight switch out of there and put it in my 91 Dodge 91.5 and then you’ll see how much smoother that headlight switches anyways I recommend put a couple drops of transmission fluid in there it doesn’t hurt anything OK you guys have a good day and he dude keep up the good work man this is Jim from Pennsylvania
Awesome idea. I usually out some dielectric grease in the connection.
I installed The Heavy Duty Headlight Relays Harness from L.M.C., in my 1991 Dodge w250, just like you did in your tutorial, but... in the two
red wires going to the positive side of the battery, I installed a 10A, fuse for each red
Thanks, great tutorias
Yes, a better air intake and turbo is always an upgrade on a 1st gen
Just wanted to come and say my passenger side headlight was considerably dimmer than driver's side and I just add this relay system and it is just as bright as driver's side now the pluggs do seam junky but it fixed my problem
Yeah I wish someone would make one with better quality wire and plugs but this does the job.
I just picked up the same LED headlights for my crew cab off Amazon recently, but haven't yet installed them yet. Nice to see we have the same taste, LOL! How have you liked yours so far? If they're that good, I'll get them for my Ramcharger and Jeep.
I really like them, especially for the price!
Could you do a video on taking a door panel off? I know they’ve got some weird clips holding them.
For sure! It's super easy. I'll get that on my list of videos. If you need help sooner than that dm me on Instagram and I'll give you some tips.
The mountains 😍 Salt Lake City?
Yep in that area!
Awesome info. I have the same relay and headlights, but have blown the headlight switch once, and I believe just a second time. Any idea why this may be?
My next guess would be a bad ground for sure
I’d like to see the relay harness wired to blue sea accessory fuse block.. the one next to your blue sea Hub .? Like you mentioned .. for the single cab ..
thank you i have a switch that burned out in weeks orded the harness from lmc truck
This should fix the issue! Make sure to replace the switch as well though.
@@decentgarage i have stock headlights would it work with them also you think?
@@nickkunat1962 absolutely and they will also be brighter even though they are stock!
Looking for some information on the wiring harness from switch to headlamps. My parking lights are dim and only work when the rruck is running.
The headlamp switch is known for going out. Put your headlights on relays and replace the switch
Nice video. I noticed your Brake and ABS message center lights are on while drive. My lights on my message center in my 92 Dodge are also on. Do you know how to fix this?
Great question Jonas. So in both my trucks the brake light is on because both do not have the parking brakes connected. In both of them I recently just removed the bulbs from those indicators until I hook up the parking brakes. For the ABS light this is very common. The best solution is the unplug the ABS module which sits behind the glove box. The module looks like an external hard drive for a computer. Just unplug it and the light should turn off. The ABS system on these trucks is laughable anyways.
I have a question. How does this work when the headlights are 110W and the harness is only good for up to 100W? I am wondering if it works well overall for highs and lows.
👍
I'm gonna try to replace my headlight switch with two toggle switches: one 35 amp for the exterior lights, and one 20 amp for the dash lights. It hasn't tried to light on fire, but all the dash lights went out and the dimmer function for em hasn't worked for the entire time I've owned it.
when redoing my wires also, i finally got to the headlight switch. replaced it and plug into switch. the center of mine was melted so bad lugs were just laying on top of switch. I cannot believe a fire did not start. please at least get a fire extinguisher. when removing switch to make repair, you have to push that release button to let headlight switch come out to dig deeper. not a terrible job but it eats much time.
This is a very good point. If you haven't put your headlights on relays yet you should definitely inspect the headlight switch as well
@@decentgarage I will say it had to be the worst most scary mess i have see in a auto. very lucky i did not burn it down. Thank you for helping us diesel bros out, whatever that means. my son calls me that and i do not understand what that is. his is bigger than mine. should he not be the diesel bro
@@thecurtray haha yeah the headlight switch is definitely a weak point. 🤘 Diesel bros
So for building our own which wire would we use as the signal wire? I feel like I missed it in your video
Good question. It's been so long I'd have to pull it out and look. I'll get back to you.
@@decentgarage alright sounds good. And if it's too much trouble don't worry, I'm gonna try to trace all the wires at some point and try to learn more about how the wiring works (or more accurately doesn't work lol)
I'm curious about the leftover passenger side headlight harness. Is there still power going to it? Did you just leave it laying there? Wonder if it would be a good idea to terminate it or remove it? What are your thoughts?
I just leave it tucks inside the fender.
@@decentgarage ok thanks. I'm a little late to the game but really enjoying the content. Trying to get caught up.
@@howardhudson7214 better late than never!
Hi bro, I just installed relay harness for my LED bullbs in both low and high beams. Is it a good idea to do that? Will it affect my LED bulbs in any way? Will my LEDs throw more light? Appreciate your advice, please
It is fine to put LED bulbs on a relay. LEDs don't put as much load on the headlight switch in the first place so you may not notice a big difference but it's a good thing to do to save your headlight switch.
@@decentgarage Thanks so much for your prompt reply. It's a great relief to hear that my LED bulb won't be affected!
I'm assuming I need the single relay for the headlights on my 1991 d350? Says dual headlights does it means 2 on each side or just two in general lol? I'm assuming I need the single though.
I don't know if I fully understand you question. The kit I use come with two relays.
I think I get what you're asking, assuming you mean drls? I believe if your truck has drls (my 91 d350 dually I/C doesn't) then you need two, but I'm pretty sure you would only need and want 1 relay otherwise. Not exactly positive and I haven't done enough research on any of this yet but I'm gonna do my own relay set up (not getting a kit) whenever I feel like I understand it well enough to do so lol
Would you know how to wire headlights with built in turn signal and running light
I don't actually. If i wanted to run those I'd spend a lot of money and get true switchbacks which can run on the stock wiring.
So I installed this harness on my truck now the headlights have a glow to them when the truck is off and now I have to either disconnect the battery or the harness to keep this from happening any ideas? They are LED headlights if that makes a difference they shut off fine before I installed the harness.
Its says not for use with vehicles with day time running lights....that mean it wont run the lights on my 93 d350? Do u have any issues ?
I guess LMC doesn't have anymore. Can see it but won't let you buy it anywhere. Maybe backorder? I'll look around
I'm sure there are other suppliers out there.
@@decentgarage found it in their mail out book. It's a different part number then what the website says. Part number 36-3580 for the single headlights version. Thanks
@@icesurf1761 awesome! Good to know
Can you post a link for this kit I can’t find it. Thanks!
The link is in the video description.
@@decentgarage whoops didn’t catch that, thank you 👍
Can you use this with the stock head lights
Yes, this is ideal to use with stock headlights.
Thank you
I've got a 93 D350 I'd like to do this to, but the site only sells relays for d250's and says they're not to be used with trucks with running lights. Has anyone done this on a D350 that you know of?
I got same issue and same question ...have you figured out the issue?
@@goatsgarage2252 nope.
Can I hook up that headlight relay to a regular gas engine
I can't say definitively because I haven't done it but I see no reason why you couldn't.
LMC has them for gassers too,same kit
So I put this relay in my truck, 93 D350, and now the high beams are stuck on, any idea?
Interesting... Stock headlights?
@@decentgarage yes, I think its because I bought the dual plug and not the single plug ones
@@solar3551 awe that might be the reason
Thanks I tired of the damn switch going out and it might burn up my truck
This will solve the problem
I wanted to to this, but thanks to daytime running lights I'm not able to
You must be in Canada?
@@decentgarage yeah I'm in northern Ontario. And to unplug the daytime running lights it causes other issues, can't win
@@shauna1945 yep, no good solution.
If your lights get brighter you most likely had a bad ground that was fixed during this install
Unfortunately this relay is no longer available on their website as of 11/2021. crap
Search this part number on the website 36-3580. For some reason they changed the part number and it doesn't show up on the website.
So you’re telling me my truck is gonna burn down?
Potentially...
While the headlights are on? Or is it just gonna give up the ghost while it’s sitting there??
@@grw707 when the headlights are on it heats up the headlight switch. Years of that and the switch starts to melt. As it melts you get shorting of wires which could occurs with the truck on or off
@@decentgarage well, I had already ordered the bezels and upgraded headlights lights from your info on videos. Hopefully that’ll mitigate the issue until I get that LMC harness. But hey get back to work on that shop!
@@grw707 also if you are running led headlights they are much safer and draw less power
junk mopar electronics the engineers should have lost their jobs years before if the upper management had some balls it would still be all american and it would have saved everyone a lot of issues! i made my own harness and wired in my own relays bosch relays or tyco are ok i dont trust any of these companies making anything ill do it myself thanks . i