battery light?

[96GT281]

well when i bought my car it had a new altenator in it but whenever i brang the rpm's past 4 grand the volt gauge would peg to 18 and the battery light would come on, so today i bought a new voltage regulator and now its sayin the volts are too low and the battery light comes on but i checked the battery and it was 12.6v and the alt output was 12.3v.

 

[Superhereaux]

check all the connections (including all grounds) at the battery and alternator and make sure they're properly tightened


the previous overcharging may have damaged the alternator and possibly the battery. is it an OEM piece?

 

[96GT281]

yea its motorcraft but the connections are good

 

[Superhereaux]

the charging system is a difficult thing to diagnose without the proper equipment

easiest thing to do would be drive the car to an Autozone, remove the alt. and have them test it. since the car is there have them test the battery too

 

[96GT281]

i did that..... it passed all tests, but any time i would bring it over 4k the volt gauge would peg to 18v and the headlights would get so bright