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new member with anemic charging system

C

Chris2017

New member
Hello group. 1998 GP GT. 300$. Needs a bunch of work, but was running well. Until I hit a big puddle hard, then drove through semi deep water. It was raining hard. Later that night the car crapped out. Later determined charging at 11.8 vdc. Replaced the alt and battery, no change. Likely possibilities? Instrument panel bulb? Don‘t think so, would have to double check. Fusible link? Assuming I determine that‘s the problem, not precisely sure how, I guess a continuity check, where do I get the material or component? Advance doesn‘t sell it. the pcm controls the alt, right? How would I check the inputs from that? Your input is much appreciated.
 


more on what its doing or not doing would be a great help.

will it crank over for one? is the check engine light on or was it? it have fuel pressure and spark?
 
The car starts, but problem is alternator is eithet defectove (tje one I replaced) or something is stopping it from dping it's job. Output is 11.8 volts aprrox. Needa to be much higher.
 
Belt might be slipping, if it squeals when started up, check that the belt tensioner is doing it's job... If the belt and tensioner is fine' then take the alternator back and have them test it.
 
11.8 doesn't sound like it's charging.

Someone snag him a wiring diagram, one of the wires is from the pcm to apply the field in order to kick the alternator on after start up. Also you can fool the sense wire like ZZP suggests with a diode.
 
A slipping belt would be obvious?

I did have to replace the coolant elbow. Put a few hundred miles on the car don't think I messed up the tensioner or anything. I'll look it all over I guess.

Yes info on checking pcm and all would be much appreciated. Autozone and All Data has resources I'm told, haven't availed myaelf of any of that yet.
 


Swiggles said:
Will the battery charge on a charger?
Click to expand...

It's a brand new Bosch.

Both alternatore read 11.8 vdc when each was installed, including the reman from advance. I could just replace the serpentine belt and see what happens. Or get a tensioner from a camaro (the kind that doesn‘t have the integral lower bypass tube) ... and see what happens. Hopefully I‘ll have the time to look everything over tonight. See what I can see.
 
Check your grounds on the trans too, if they were already corroded then puddle finished them off is bet.

If the belts squeal other then when you go in a puddle then they need to be replaced anyways. I'm a fan of gates brand belts, they last pretty long.
 
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