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> Voltage Regulator Connundrum, why won't the generator light come on?
72 IXXIV
post Mar 12 2015, 05:34 PM
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So I was about to head up to McMark's for the BBQ a couple weeks back, got in my car and the red charging light was on before I started the car (normal) and after I started the car (a problem).

The fan belt was present and tensioned, so I hoped it was the voltage regulator and not the alternator.

I ordered a Hella regulator from Pelican Parts and while it would connect with the board, the relay board cover would not fit on. The plug on the hella is not in the same place on the regulator as the bosch one.

But since it connected (at least!) I gave it a try. Turn on the key, but not started, and no charging light. Turn on the car, still no light. But also no charging. Voltage across my battery is almost 12v with the car off, and 11.5 with the car on. No charging.

So I ordered a new Bosch voltage regulator, and just installed it. Same thing. No light with the key on and engine off (no oil light either this time!), no light with the engine on either. Still no charging across the battery.

Hey, maybe the bulb(s) blew? I put the original, broken regulator back in, both dash lights light up when the key is on but the car is off, and the oil light goes out when its on, but the charging light stays on. And no charging across the terminals.

What gives? Did I just get two bad voltage regulators? Am I missing something?

Thanks for your thoughts, folks!
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ThePaintedMan
post Mar 13 2015, 10:26 AM
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Did you check the fuses?

Also, what is the voltage at the battery with the car running?

Finally, if you still suspect the regulator, you can have then tested (even one of the new ones you bought) at the local FLAPS.
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