1992 Nissan 240SX 92 240SX battery drains within 30 mins

CARLUCCIJA

MEMBER
1992 NISSAN 240SX
4 CYL
2WD
MANUAL
140,000 MILES

This car battery is a brand new nissan battery installed by nissan. The Altenator has been replaced, distributor has been replaced and a bad fuel injector using all nissan parts. Nissan has also done a full electrical diagnostic and cannot figure out why the battery dies so fast. The have replaced the battery 3 times to make sure. I'm quite tired of the problem. I also do mechanics as a hobby and its racking my brain. Can I get some help.

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

Get an analog voltmeterremove the negative battery cable, attach the red lead to the battery post, black lead to cable end, then pull fuses one at a time, make sure there are no accessories or lights in the on position, Key off! Close the door after each fuse and check meter, when you pull the fuse for the bad curcuit, the meter will drop to 1 volt or so. Check all fuses, even under the hood. If meter does not drop, remove the battery connection from the alternator, if it drops now, the diodes are bad in the alternator.
Repair the curcuit that drops the meter!