got a issue and i dont know where to start, my alternator dosent charge my battery, had it tested chked out fine, had battery tested works ok, now my ignition dosent turn the starter but i can manually start it, and when it starts the battery light comes on, so know what , i think its needs to start from the ignition to tell the computer to chrg the battery, so i think the inside relay panel is not getten enought power?
starting help
- Thread starter tsparks01
- Start date
tryed looking in the service manual? They may have some step by step guides to diagnosing the alt not charging the battery. Id go and look in my service manual for your but im not at home.
tsparks01;1138536 said:
The battery light only comes on when you are discharging the battery. You are discharging it because the load is greater than what the charging system is supplying. Usually, when the light is on, there is very little output, if any at all.
Do you have a belt on the alternator? Did you ever have a problem with it not cranking over prior to your bench testing the alternator? You mentioned it doesn't always crank over with the key. Is that why you had those parts tested in the first place?
will the light go on and off when your driving it? i had 2 alternators that would charge at 14v and then drop to about 12v and back to 14v constantly while i was driving.
i changed the brushes in the alternator and was good to go.
if you have a volt meter, check the voltage to see exactly what you are getting on the car
i changed the brushes in the alternator and was good to go.
if you have a volt meter, check the voltage to see exactly what you are getting on the car
Check the resistance of the line off the alt to the battery. Those get old and corroded after 20+ years, and offer alot of resistance. They are easy to replace, and pretty simplistic. I would start there. The starter not working right is a common problem with these cars. Its a wiring issue as well. There are tons of fixes listed on SF, and im sure they are here too. http://www.supraforums.com/forum/showthread.php?t=503046 There is a simple fix for it. But the alt is prolly bad wire between the alt and the battery. Let us know what you come up with tho.