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- เผยแพร่เมื่อ 18 มิ.ย. 2024
- In this Video we'll explore the common symptoms of a faulty or damaged ground strap so you’re aware of what to look out for!
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Measure Voltage between battery negative and the frame, also between the alternator negative and battery negative. If you get elevated readings, there's a ground fault.
Wow that is great. Thank you for sharing. Cheers!
Doing a "voltage drop" test confirms condition of ground strap. with engine running and lights, fan on high, radio on, and a multi meter switched to DC volts, put negative on battery negative, the other lead touch metal of engine block, alternator housing, ground wire eyelets to seek faulty connections. 0.056 or less is good, higher say 0.09 or 0.1 indicates fault in ground. The reason everything on when doing test is to "Load" the circuit. Not loading the circuit can give false readings, i.e. corrosion can allow connection, but when a load is applied the corroded connection sees amperage beyond it's current capabilities and temporarily breaks connection.
Many years ago I owned a 1963 Diamond-T truck. It started having electrical problems in the dash. I took it to an electrical technician and they told me they would fix it, no problem. The next trip I had trouble getting it started. Took it back to the electrical mechanic shop and they said my 4 battery's were just bad. Needless to say, 4 new batteries and I still had problems starting the engine and still had problems with the dash lights and other cab lights. I called up a guy I knew who was a Cummins engine mechanic and told him my problem. He told me to take the ground off the frame and the battery and throw it away. He said buy a new cable and then he told me to buy another cable to put on the opposite side of the engine to ground it to the engine and then to the frame. He also told me to actually sand or grind the places on the frame and engine. It worked great from then on. It had cost me a couple of thousand dollars to go through the previous so called repairs and lost wages due to the down time the truck was in the shop.
Don't buy those red and black, painted, battery cable connectors from Putozone. I put one on my tractor and it wouldn't even turn the engine over. I checked all the other connections, cleaned the other terminal, and then discovered there was still high resistance at the new connector. It didn't look painted on the interior surface that contacts the battery post, but, apparently, it was spray painted with a clear top coat that was also on the inside surface. I had to physically scrape that out with a knife. My battery terminal brush wasn't up tough enough to remove it.