Need Help - BMW E30 M20B20 alternator is not charging battery

Need Help - BMW E30 M20B20 alternator is not charging battery
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[@simonvancoevorden295]

A few simple steps
Is the charge light operating as it should , ie coming on with ign only then going off when you start the engine ? It energizes the charging circuit .
If it is check if the alternator is rubber mounted , if it is check the earth lead between the alternator body & the engine bracket or block .
Then check the voltage at the main battery lead at the back of the alternator, could be a high resistance there .
If the car has a harmonic balancer check the rubber bonding on the crank pulley.
Cheers Simon

[@leroylucas961]

you need to earth the alternator to the engine and engine to the body

[@Life75272]

Hi there have you find the solution ??, I’m suspecting the cluster wires .. or the exciters wires .. ?? Kindly I would like to know .

[@rehamlulu7492]

Check the cable from alternator to cluster! Yes cluster , in the back of cluster there is c1 c2 c3 color white yellow and blue . The blue one check the connectors . Check also the cables on the alternator there are 2 wires the small one follow it if there is any cut there one of it goes to cluster . Good luck

[@timisoutdoors]

Did you figure it out?

[@RichardVerret]

Bad battery? What's the voltage across the battery with the car running?

[@ODGColornChrome]

Once it is running, if you disconnect the battery and the car dies, your alternator is bad.