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What is your question?
Battery died the other day bought a used one. then it died, alternator tested bad, bought a reman. now with a "new" alternator and a good "reman" battery the battery light comes on after about 2 mins. tested battery again and it was down to 12.5 v but still good under a load. i have ohmed the cables grounds and even the battery temp sensor and their are no opens anywhere. i am stumped and i need my vehicle up and running asap! any help is greatly appreciated
2 Replies
Suspect poor quality parts!.. What is alternator output at battery terminals ... engine idling? ..... Engine at 1500 rpm?
EXTERNALLY controlled by PCM . DON'T guess-- PROVE as you go through each part of the system. IF you KNOW the battery is good , AND you know the alternator is good(OFF-CAR bench test) , then that leaves vehicle harness and control circuit as most likely cause. When you stated you 'ohmed' the cables , What are the best readings you had? (Numerical , not simply open/closed) ? More than 2-3 ohms?
ohmed again this morning at 200 ohms and getting 1.5 along all grounds and + cables.both were battery and alt generator were benched tested and both tested good. am not sure what i am supposed to be pulling as far as the ohms, but noticed that there was a ground on front and for some reason when i hit the + on the field of generator it flashed. i did it again and it flashed again. thanx for the help so far!
Put back together and put generator to task. started at 14.46 volts than dropped 11.83v after about 2 min. am waiting on another one to be delivered. hopefully that is my problem. on bench test it checked out good but they only left it on for a few seconds.
Bench testing is a waste of time! .. What it does on vehicle is what counts... BTW, pro scanner can 'full field' alternator to test PCM if needed but they pretty much solved those problems back in the late 90's .. IF PCM issue...should have C.E.L. on and trouble code.. Good luck... You should have purchased > NAPA Power Supreme Alt.
Have been driving since Sunday night. Thanx for all the help. Stupid reman parts and aotuzone and O'Reillys. Part from O'Reillys and autozone down block did test.