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Battery dies after startup what could it be? Altenator checks fine

jayroca

jayroca

Banned
Tryna to diagnose my issue with my battery:

Ok starters its a new battery i got from the auto parts store 2 days ago because my battery died on me coming home so i replaced that i even replaced the altenator and it checks out fine the alt is a 99+ altenator do i need the 99+ plug/harness for that alt? Could it be a bad fuse? Checked my grounds even cleaned them but still battery drain im reading 11.4 on the volts and it goes down through time...any ideas? Could my rewire to my fuel pump cause this? Any suggestions? Thanks!

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Scotty i have a stock stereo any other ideas the battery starts after about 5- 10 mins of the car on and starts draining slowly
 
its a pain in the ass but you need to test both fuse boxes key off, to see whats lighting up, and if it should be. theres only a few hot fuses car off. one for some reason is still drawing power.

a ohm meter will tell you just how much power is being taken. a test light will only let you know if its hot or not.
 
Scotty, I think you are misreading what he is saying. Its not a draw with the car off, it is a draw with the car running. Sounds like the alternator is not charging. Doesn't mean the alternator is bad, but it could be a bad connection going back to the battery. I haven't messed with anything electrical on these cars yet so I don't know if there is an alternator fuse/fusible link that could be causing your issue. I know on my Stealth I once popped the fusible link and my alt couldn't charge the battery until that was replaced.
 
it dont really say running and or off. battery's get old and quit when they feel like it, if the battery was old and shot.

i assume its car off if its at 11.4 volts. if the alts tests fine it should show over 12 to 14 volts at the battery engine running.
 


who takes the title seriously lol

but most cars wont even run on less then 12 volts.

being you had the engine out and issues with the starter and stuff, it is possible somethings not hooked up right. you do have the battery cable from the alt to the top of the fuse box hooked up right?
 
Scottydoggs said:
who takes the title seriously lol

but most cars wont even run on less then 12 volts.

being you had the engine out and issues with the starter and stuff, it is possible somethings not hooked up right. you do have the battery cable from the alt to the top of the fuse box hooked up right?
Click to expand...

Yes

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Update: i said f**k it and wired my altenator to my positive side of my battery and walla the volts are at 14 its a short somewhere on that alt wire

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you have a cam, and a low idle?

the fuse box could be the problem with the cable.

in older cars, they would drop to 12+ volts at idle and go up with the rpm's why we hold the gas @ 1500 rpm's when jump starting a car, so it gets the full voltage.

my regal does this to a point, lights on the volts drop, turn em off the volts go back up, lower at idle then goes up a bit driving. its just the alt spinning faster and making more power.
 
As I said, it sounded like the alt wasn't charging the battery for some reason. Glad you got it solved (if not temporarily):thumbsup:
 


jayroca said:
Yeah stealth idk alt checked out fine at the auto parts store

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Click to expand...

The alt is obviously fine if running a wire directly from it to the battery solved your issue. Your problem lies in the wiring/fuse box like Scotty said.
 
older high amp alt 0 gauge wire highest cranking amps you can find that fits....

ITHURTZ I think did a good job on his electrical improvements when he went turbo
 
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