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Battery draw
- Thread starter Parttime
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MrMarty51
Well-Known Member
Update finally got time to work on my truck!! I found a nick in the wire that comes from the positive battery cable I think it’s a 10 gauge wire that’s splits off the large starter cable to the firewall junction block. I cut the wire at the battery terminal and disconnected it from the junction block and pulled it out. Inspection of the wire I found a very small nick in the wire. I slipped a piece of heat shrink on it. I then routed back the wire the same way. ALL GOOD 
Thanks for all the post and help. It really means a lot to have great people to take their time to help. I’ll attach a photo of the nick.
Thanks
Jim in Palacios Texas
Thanks for all the post and help. It really means a lot to have great people to take their time to help. I’ll attach a photo of the nick.
Thanks
Jim in Palacios Texas
Attachments
dbrannon79
I'm getting there!
Nice that you found this and good thing that it didn't burn the truck to the ground! I would look to see what might have caused the tear in the insulation. you might need to secure the wire away from the area or wrap it with some heat / rub proof sheathing.
dbrannon79
I'm getting there!
Thinking further on the wire you found, that supplied power to the alternator and the cab. double check your alternator for a power draw and if it's still working. even if it was randomly arking and or shorting to ground, it could have damaged the internal regulator in the alternator.
jrsavoie
Recruit
Also check the wire size going to the load center. They're most often marginal at best.
Like all the other GM wiring. Most other manufacturers as well.
Like all the other GM wiring. Most other manufacturers as well.
ak diesel driver
6.5 driver
I ran a 4 gauge wire directly from the battery to the junction on my plow truck. Made a big difference. Dash gauge is more accurate now too.
MrMarty51
Well-Known Member
Also, with the multi meter on AC voltage scale, one probe on the alternator battery terminal, other probe to ground, see if there is a voltage reading.
If You get a voltage reading on AC scale then there is faulty diode in the alternator.