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-   -   Working battery AND alternator but still won’t charge (http://www.the370z.com/engine-drivetrain/136508-working-battery-alternator-but-still-won-t-charge.html)

brandad_1 08-05-2021 12:01 PM

Working battery AND alternator but still won’t charge
 
Just as the title says. I bought and tested a new battery and alternator and the car still won’t charge. The battery’s maintain 12v after charged but as soon as I turn on the car the volts drop to 11 and keep dropping till the car eventually dies. Again the alternator DOES work and the I did a parasitic drain test and nothing seems to be draining the battery. What else can it be?

Ghostvette 08-05-2021 12:15 PM

Your best bet will be the FSM, (link in my sig). I suspect there is a fuse/fusible link at or near the block of stuff that is by the positive terminal of the battery, that is shot. Good luck.

Evildky 08-05-2021 12:38 PM

Do you have any aftermarket electronics? stereo? additional lights?

Just to be clear, with a charged battery or a jump, the car will start right? And the gauge shows it charging at 14 ish volts?

Spooler 08-05-2021 01:11 PM

Check the inline fuses on the battery positive and make sure they are not blown.

Ghostvette 08-05-2021 01:50 PM

There are 3 fuses you need to check. One is a 140A fuse at the battery, the other is a 100A fuse near it. The third one is a 10A that comes off terminal 3 of the alternator. Page CHG-14 of the FSM has the info. Do not rely on visual inspection, take a ohm meter and check resistance. All three should be under 1 ohm. My bet is on the 10A fuse for terminal 3 of the alternator. :tiphat:

370DriftZ 10-26-2021 04:41 PM

Any update on this? I am also having battery/alternator issues.

Ghostvette 10-27-2021 08:03 AM

Quote:

Originally Posted by 370DriftZ (Post 4012200)
Any update on this? I am also having battery/alternator issues.

Start with the checks I laid out in post #5. How old is the battery? If it's over 3 years old, replace it.

Go to PepBoys or whatever autoparts store is in your area and ask them to do a battery & alternator check. It's usually free, at least it is in my part of the country. :tiphat:


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