I have a '91 Ford Sierra Saphire 2.0 OHC (pinto). Have been struggling with having no charge for weeks now. I've tried two different alternators, had one of them completely rebuilt by a professional, so alternator is not faulty.
Every time it comes down to the voltage regulator breaking. If I replace regulator, alternator charges for like another 5 miles, then voltage regulator dies again. (I've already repalced it 3-4 times, while trying, I pay 10$ for every possible solution :/ ).
I've double checked every single connection (alternator B+ -> battery, alternator D+ -> dash, engine -> chassis, battery negative -> chassis, etc.), I have solid Earth everywhere I need to have (at least according to my multi-meter).
Haven't had the chance to try another battery. Can a bad battery in any way cause serial voltage regulator faults? If not what else can?