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Old 03-24-2004, 08:49 PM
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low voltage on 67 chevelle

Have got a 67 chevelle that I'm having some trouble with. Car is running right at 12 volts on gauge at idle. When I run AC it drops even lower. Replaced the alternator twice with a NAPA 63 amp rating. Replaced the regulator also. Replaced battery today with a new Interstate one. Looked to be charging good at first, right at 14.5 at around 600 RPM. At speed charged good, however when I would come to a stop, it would drop back down to around 12, lower with the AC on. Decided to open her up, got up to around 110 MPH, coasted back down to around 55MPH, now it is showing 12 volts or less. Will not go up over that. If I disconnect the voltage regulator, the gauge jumps back up to around 14-15 volts. Any ideas would help. Thanks!

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Old 03-25-2004, 06:32 AM
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Bad regulator?

or...a loose wire somewhere.
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Old 03-25-2004, 11:11 PM
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Now would be a good time to upgrade. Get rid of the external regulator and get a higher output alternator. The only reason to keep the old stuff is if you are trying to keep the factory "correct" look. Otherwise technology is much better with the newer stuff. The swap is not hard at all. You have several options. 63amps is not very much especially if you have a stereo, electric fan/s, A/C, etc... some of the newer alternators have full output at idle (the newer computer controlled and heavily optioned cars need that to keep the computer happy).

Just something to think about.

Otherwise I agree I would change the regulator and see where that gets you, just remember it is not rare to get a bad regulator (even if it is new).

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Old 03-26-2004, 07:40 AM
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Thanks for the replys, here's what I've done: replaced the new NAPA regulator with a new WELLS VR715. From what I understand from the teamchevelle site, this reg is suppose te be a solid state unit. Cleaned up all my grounding points where the reg mounts. Noticed the #3 wire running into the reg connector looked like it had been hot, it also had a fusible link. Replaced that section of wire. Car is charging good at this point. 14-14.5 volts. I am running a be cool 16 inch fan rated at 21.6 amps. No big stereo, car does have AC. Did notice with everything on at idle that volts drop down to around 12, but if I pick the idle up slightly it shoots back up to around 13. Will update to a better alt later, think for now I'll try what I've got for awhile. See ya!
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