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Discussion Starter · #1 ·
1969 SS 395 350hp. I've had the car about 6 months. The voltage seems to flucuate and not hold at 13-14 volts. Lights are dim and voltage around 10 when at idle. I replaced the battery, but still seems to do the same. It looks like the previous owner put on a new alternator and voltage regulator. Could one of them be defective or not enough amps on the alternator? Other hints? I don't have alot of "stuff" pulling amps....no extras.
 

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If the regulator and alt. are new, they are "probably" good, but a check wouldn't hurt, especially the regulator.
I'd first look for poor connections or grounds. Start with your battery cables especially the ground cable. Next all connections at the alternator and regulator.
Check headlight connectors,headlight grounds, engine to firewall ground, battery to body ground, main power feed from battery to horn relay, firewall connectors - look for loose or corroded connections on all these.
It sounds like there is a bad connection causing a voltage drop.

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Check the B+ lead (large red one) on the back of the alternator at idle. Expected output should be around 14.5 volts. See what it is at that point.
 

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Discussion Starter · #4 ·
Appears to have been the regulator. After reading some old posts I decided to put on a Wells VR715 solid state regulator. It solved the problem right away. Gen light went out after starting and I carry more volts as it should.
 
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