ELECTRICAL PROBLEMS- battery not charging (1 Viewer)

Joined
Oct 25, 2013
Messages
127
Location
Texas
1976 FJ40 2f engine, all stock
1. Alternator is good, even replaced with a new one
2. replaced voltage regulator
3. All gauges work.
4. All lights, turn signals, brake, and backup work

Yet I am not getting any more than 12.16 amp from the back of the alternator. The gauge does show discharge with the lights on.

Drove the 40 last saturday all gauges were working, parked in the driveway and return for a dive that night. I had no headlights, or running lights and the alternator was not charging the battery again. Yet earlier in the day they had worked. After checking fuses and I found the tail lights fuse blown. I replaced that fuse and the lights worked again but still the alternator was not recharging the battery.

I am thinking there must be a bad ground SOMEWHERE. I found a white wire with black stripe broken behind the main fuse panel, but nothing there to wire it back into.

Buy removing one fuse at a time, starting with the headlights and watching the alt gauge, to see when it shows charging again, would that isolate the bad circuit then allow me to find the problem in that section?

PLEASE help.
Thank You
 
Last edited:
Joined
Jan 25, 2007
Messages
3,949
Location
Lincoln, CA
let me know what you find... my amp gauge doesn't show positive any more and my battery constantly needs charging.
 
Joined
Oct 25, 2013
Messages
127
Location
Texas
I ended up finding the main wiring harness ground was broken, I rewired and reattached.
I removed the fuse panel and the removed all the connections on the back, sanded them and reattached.
Also under the hood the connection had several splices, I removed 2 and ran a new wire.
I also cleaned all the connections where the fuses plug into the fuse panel.
Which one of these fixed my problem I am not sure. But for now its charging and all gaugesare working
 
Joined
Jan 22, 2007
Messages
2,953
Location
Alva, Fl.
White with black stripe is always ground(75-78)--Always remember what Claudia says--"It's a ground issue"
 

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