Ludwig Posted January 4, 2006 Report Share Posted January 4, 2006 My 92 STS' battery voltage is tumbling everytime i'm idling or even at rpms<2000. It's happening even when i'm running nothing more but the heating ventilation and keep the engine idling, then in minutes the voltage is displayed at 11,5 Volts, still tumbling. When really no accessory is on, it's charging a little, and especially at rpm>2000 it's all OK, climbing to 13,5 Volts and beyond. The scary effect is that in mid-drive, being below 2000 rpm, the headlights' brightness goes down together with the voltage drop. As soon as i run it at higher rpm they go bright again... Big mystery is, both the generator have been already swapped (ACDelco remanufactured alternator CS144 incl. regulator, and a new battery), without doing much to solve the problem. Discharging of the battery while parked does not seem to occur. 92 SevilleTS Link to comment Share on other sites More sharing options...
adallak Posted January 4, 2006 Report Share Posted January 4, 2006 Did you replace the alternator and the battery because of the same symptoms? What happened? The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Ludwig Posted January 4, 2006 Author Report Share Posted January 4, 2006 Did you replace the alternator and the battery because of the same symptoms? What happened? The old battery (a Delco Freedom 72) was badly to stay charged during parking/storage. After 2 days of no use it was discharged to the point of not being able to start. But the poor charging symptom was there all along and i think it didn't have anything to do with this battery issue. The charging problems just started out of the blue sky when one day i noticed the headlights to have lower than normal brightness, then it was noticeable every time again. Link to comment Share on other sites More sharing options...
bigjayzway Posted January 4, 2006 Report Share Posted January 4, 2006 Maybe try cleaning the battery cables really good, seperate the two positive cables and clean, also clean the terminals on the battery itself. Life is too short to grow up! Link to comment Share on other sites More sharing options...
JohnnyG Posted January 5, 2006 Report Share Posted January 5, 2006 This sounds like the classic symtoms of a bad ground connection(s) to me. There are several throughout the engine compartment, and throughout the car for that matter. Check all of those under the hood first, particularly the ones from the engine to rad support. I think this one is notorious for "dissappearing" for some reason. Keep in mind this post is a recollection of things read in past posts, you may not even have a rad support ground on your specific model, but the theory is the same. They can break, corrode, loose connection, or just be removed during service and forgotten. Never underestimate the amount of a persons greed. Link to comment Share on other sites More sharing options...
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