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Old 04-09-2011, 06:31 AM
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Lights Dim Sometimes Flicker

Working on taking care of all the little issues on this car (1968 Vette), my next project is to find out why the headlights at a low RPM get dim until I increase the RPM (drive faster). I feel it has to do with the OLD voltage system, external voltage regulator and stock alternator. I have a digital voltage gauge mounted inside the car and I can watch the voltage drop as the motor RPM drops. I am assuming this is because of the external stock voltage regulator and alternator. I owned a 1970 Plymouth Road Runner back in my younger teen days (wish I still had that car, got married back then and the old lady said it had to go). I never remembered the lights doing that on that car as well as my first car which was a 1964 Dodge Polara.... they both had external voltage regulators. My plans are though is to install a diferent alternator with the regulator built inside, nice chrome model someone gave me. BUT, I would still like to know why the voltage drops at low idle and the lights dim of course (due to less voltage). Is there an adjustment I can make on the voltage regulator to correct this???

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Ron - Maryland
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Old 04-09-2011, 08:00 AM
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things to check

there are several things to check. The first thing is the condition of the belt and tension. Loose belts don't always squeal. Most auto parts houses will check your alternator for free. since it works at higher Rpm it's probably good. Do you have any extra loads not original with the car. A high power sound system ? , bad battery or corroded terminals,... other wiring conections ?
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Old 04-09-2011, 08:38 AM
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Lights

Quote:
Originally Posted by timothale
there are several things to check. The first thing is the condition of the belt and tension. Loose belts don't always squeal. Most auto parts houses will check your alternator for free. since it works at higher Rpm it's probably good. Do you have any extra loads not original with the car. A high power sound system ? , bad battery or corroded terminals,... other wiring conections ?
Belt is tight in fact about 2 years ago I repleced the belt. I even replaced the alternator but the other one was good as well. Repalced the voltage regulator as well... car always did this when I purchased it from a dude 8 years ago. I have no other HIGH volt draw hooked up... I just never noticed this 40 years ago or so when I owned the Road Runner and old Dodge.

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Ron - Maryland
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Old 04-09-2011, 06:27 PM
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Best thing I evr did was to upgrade to an internal 100 amp alt, fixed my dim lights etc....
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