Check the charging voltage at the back of the alt. GM side post batteries would leak, causing acid to leech down the cables, creating all sorts of problems.Test power into the underhood fuse center too

Answered by 2CarPros Jack (expert)
12,033 answers provided

Thanks for the input, I’ll check the cables first because the last battery was leaking and really made a mess around the tray and all. I did notice that the alternator was much noisier than I had remembered the last time I drove it. Almost like a clutch fan problem, but it’s at the alternator. I’ll get into it this weekend and see what I find.

Thanks again for the input and it looks like the voltage regulator is on the alternator itself.

Response from dingoe
1 question asked

Looks like the problems is the cables keep coming loose. Can I use some locktite blue on the cable bolts?

Thanks

Response from dingoe
1 question asked

I wouldnt , try to arrange the cables or support them so they dont vibrate and loosen

Answered by 2CarPros Jack (expert)
12,033 answers provided

The negative stay tight so maybe a simple zip-tie would do the trick.

Thanks

Response from dingoe
1 question asked

hi. so would that info be useful for a 1991 Astro? cause i USE TO HAVE a problem, once in a while, starting it up, but then i changed the alternator and the battery and the battery light comes on when driving. it turns off when i brake and accelerate, but when i am just "gliding" it reads low. i dont know anything about cars and really dont want to get swindled at some lube n' tune trying to make a buck. and sorry if this info isnt enough.

thanks

Answered by safari-chris
0 questions asked

Might have to replace the cable if acid leeched into it.The curse of the side post battery

Answered by 2CarPros Jack (expert)
12,033 answers provided