My 2001 dodge ram pickup 1500
318 5.2l battery wont charge I
replaced the battery altenator
and idk what els it could be help
ECM has the voltage regulator built inside it, bad way of doing it but that might your trouble, I have seen a few people rewire the charging system back to the old external regulators, but you would need a factory wiring schematic for both styles to do the rewire, then you may have a check engine light.
Check your charge cable coming off of your alternator going to your battery mine corroded and killed my battery every time it ran
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