Can't figure my 95 LeSabre out. It's alternator surges for some reason. At idle it starts off at battery voltage (12-ish), then surges up to 15.5 volts or so and pulls the engine down 2-3 hundred rpm then drops and goes back to battery voltage and does it again. Each cycle lasts 30 seconds or so. It's a 140 amp Delco with only one wire going to the regulator (factory setup). My really cheap K/D inductive ammeter shows a 75 amp draw when it pulls the engine down. If I unplug the regulator the voltage stays solid at battery voltage and it idles fine. It's been getting progressively worse. I had to put brushes in the alternator, ran for awhile doing the same thing then a few months later it smoked the guts and it quit. I put an O'Reilly rebuild on it yesterday, same thing. I slammed the hood and resolved to take it somewhere Monday but then I thought of Y/T and how many are knowledgeable of auto electrical and thought I'd post.
- Thread starter Batel
- Start date
guido
Well-known Member
Hello batel,
It sounds like a bad ground issue at the engine side. Make sure you have a good ground to the engine from the battery. Also check the alternator to engine ground. The internal alternator regulator needs a good ground to work correctly. You can hook up a jumper cable from battery negative post to the alternator body to see if it cures the issue. Good luck!
Guido.
It sounds like a bad ground issue at the engine side. Make sure you have a good ground to the engine from the battery. Also check the alternator to engine ground. The internal alternator regulator needs a good ground to work correctly. You can hook up a jumper cable from battery negative post to the alternator body to see if it cures the issue. Good luck!
Guido.
Janicholson
Well-known Member
If some component is trying to run but is shorted, the short might be through a circuit breaker which has a big draw periodically. Jim
Hobo,NC
Well-known Member
- Location
- Sanford, NC
https://www.google.com/webhp?source...=2&ie=UTF-8#q=95+LeSabre+charging+circuit
Have fun BTDT and had to replace the PCM on a few... Buick's and Pontiac's electrical problems of that vintage are why I would not own one.
Hope and pray the turn signal flasher does not give problems they built the car around the flasher...
Have fun BTDT and had to replace the PCM on a few... Buick's and Pontiac's electrical problems of that vintage are why I would not own one.
Hope and pray the turn signal flasher does not give problems they built the car around the flasher...
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