Thanks for quick response!
Had engine rebuilt recently, alternator light on since returned from shop, so I am questioning if wires were connected to correct terminals on back of alternator when I got car back. Have three wires on back of alt, am sure of black lead because of connection type, but possibly the other 2 are reversed? Can I damage alt by reversing these leads? Where else should I be looking?
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you can try cleaning the battery terminals to see if the battery has a good connection I had this same problem..take it to someone who can test the alternator to see if it is charging the battery when the motor is running...if it is not.charging it will kill a battery very fast...most auto part stores can test it for you..they are expensive to replace cost over 200 bucks. take it to a shop that can rebuild it..had mine rebuilt for 60 bucks and it just as good as new..if the alternator isnt the problem...check to see if anything is stuck in the on postion..trunk light..dome light..etc. if this problem started very quickly it is either the battery connection needs cleaning or it is the alternator..
Seems like a faulty voltage regulator, or that the wiring between regulator and alternator output is working intermittently. Before fiddling with the voltage regulator, clean the alternator plug, located on the opposite end of the pulley/belt. After cleaning, plug and unplug a few times, to insure a clean, solid contact.
I have a 88 and mine done the same thing. I recently had the central power supply rebuilt at a shop in Minnesota and the problem is fixed. After driving the car for 2 years with no working gauges, lights or heat. I now have lights, heat and air!!! I now love my caddy!
I am 99% sure it is the alternator. They are called throw away alternators because dealers are not supposed to rebuild them however I worked at a dealership for over 20 years and rebuilt 100's or more. If you know where an alternator/starter shop is, that would probably be the cheapest way to go instead of buying one.