Battery Draw?

Tiny
JOANNE WILKENING
  • MEMBER
  • 2007 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
Battery goes dead when sitting, battery voltage 12.6v. Reads 12.6v draw between neg post and neg cable. (New AC-Delco alternator - did not help) I removed all fuses/breakers (one @ a time) from under hood fuse box - also un-hooked power cable to starter - no help - when I unhook power supply cable from under-hood fuse box to rear (under seat) fuse box the draw drops to 8.2v - removed all fuses/breakers in rear box (one @ a time) - still 8.2 draw.
What gives?
VIN#1gndt13sx72177639
thx, Brian
Thursday, August 7th, 2025 AT 11:59 AM

1 Reply

Tiny
MECHTRIX
  • MECHANIC
  • 382 POSTS
I think maybe the cable itself might be touching the body somewhere along the way. Id check it disconnected from both ends to see how high the resistance is. Also just checking to see if there's continuity between the cable and the body of the vehicle can help to find out if its grounding out somewhere. Good luck
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Thursday, August 7th, 2025 AT 9:28 PM

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