Charging Problem Need Help Asap.

ok so picked up a 91 rs with a 305 for free.. the trick was all i had to do was get it runnin. My room mate owns motor tec..( Import shop) so i thought you know no biggie. got it to the shop tested the alt bat and there were ok. then we tested the ing coil and it had no continueite.(sorry bad spellin) so we replaced it and it ran fine for bout an hour. then it died. so we got it back in the shop.. we used a volt meter to check the alt and bat. the alt was readin 10.8 so i returned it for a nother one. went back to the shop put the new one on and it read 12.8 an the batt was 12.5/ so we thought we just had a little power drain some were. we let in run for bout 20 mins and it ran beautiful. my guy took it out for a spin around the block and it started dying out on him. soon as he pulled it in the bay it died. an i mean the batt was completely dead...1volt dead. lol. but we cant seem to figure it out. why won't the alt charge. what would make it do that. please if any one has any ideas please let me know. eathier repost her or my email is [email protected] ([email protected]) or if you have aim..b16eg. please i need to get this fixed. thank you for any and all your help.

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Bump...need some help

have you checked all of your grounds? good clean connections everywhere?

so the alt is only putting out 12.8? belts slipping? mine puts 13+..my battery is constantly at 13+... (with the car off)

Welcome to AF but do not link competing F-body boards please. You will find more than enough knowledgable members to help here.

John

1-What is the alternator putting out when running?

2-I know it sounds silly, but you sure there's a belt on it? Usually 'free car if you get it running' = it's sat for a bit and may have rotted and is not turning or is not there, broken tensioner, etc....

3-Broken battery feed cable?

could be the tensioner...or the wire leading to the battery on the back of the alt...or loose connections..check all of that...ive had more than my fair share of alt trouble

And the winner is?

Oh, and stone, what is with that sig, it's giving me a seizure.

And the winner is?

Oh, and stone, what is with that sig, it's giving me a seizure.


i like to switch it up man

If you rule out the belt, check voltage drops across battery cables and power wires from alternator(do the ground side too) A charging system should put out 13.5-14.5 volts when running. A good battery should have 12.6 volts when sitting. Engine off. If the car has been sitting with the battery connected I would suspect corroded cables/bad connections.