Working battery AND alternator but still won’t charge

brandad_1 · 08-05-2021, 12:01 PM

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.

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

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.

08-05-2021, 12:01 PM	#1 (permalink)
brandad_1 Base Member Join Date: Jul 2020 Location: Los Angeles Posts: 25 Drives: 2010 Nissan 370z Rep Power: 4	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?

08-05-2021, 12:15 PM	#2 (permalink)
Ghostvette A True Z Fanatic Join Date: Aug 2013 Location: Shawnee KS Posts: 5,698 Drives: 15 Magma Red 6MT Rep Power: 2684376	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. __________________ 2015 Magma Red 6MT Sport Tech/2012 Fairlady MB 6MT Base (RIP 08032018)https://www.nicoclub.com/FSM/370Z/Coupe/

08-05-2021, 01:50 PM	#5 (permalink)
Ghostvette A True Z Fanatic Join Date: Aug 2013 Location: Shawnee KS Posts: 5,698 Drives: 15 Magma Red 6MT Rep Power: 2684376	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. wanker and BettyZ like this. __________________ 2015 Magma Red 6MT Sport Tech/2012 Fairlady MB 6MT Base (RIP 08032018)https://www.nicoclub.com/FSM/370Z/Coupe/

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08-05-2021, 12:38 PM	#3 (permalink)
Evildky Base Member Join Date: Aug 2020 Location: Louisville, KY Posts: 89 Drives: 13 Nismo STU/T3 Rep Power: 10186	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?

08-05-2021, 01:11 PM	#4 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,533 Drives: 2013 Nismo 370z Rep Power: 2684391	Check the inline fuses on the battery positive and make sure they are not blown.

10-26-2021, 04:41 PM	#6 (permalink)
370DriftZ Base Member Join Date: Mar 2020 Location: CA Posts: 9 Drives: 09 Nissan 370Z White Rep Power: 5	Any update on this? I am also having battery/alternator issues.