Electrical problems removing and reinstalling the dash

Tiny
HAWKEYE 513
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Just recently had to change the heater core in the vehicle listed above LS. After removing the dash and disconnecting all electrical harnesses, changed the heater core, and reassembled everything as it was. Everything worked except I now have no power locks, and no headlights, turn signal lights work, but no headlights. Removed the dash again and started chasing down wires only to discover a broken green wire that both the headlight and rear hatch power lock wires feed into a plug- in harnesses (purple color coded) that attaches into some sort of console that mounts at the bottom center of the dash by the floor. Two other harnesses (one blue and one brown)also plug into this console. Repaired the green wire and reassembled everything. Same problem as before. There is also what looks like an aftermarket remote start system that's been installed, one wire taps into the green wire that was repaired, the other to a black wire that feeds into the same purple harness plug. Please help! Not sure what to do or where to go from here. Everything worked perfectly before the dash was initially removed.
Thursday, December 31st, 2020 AT 12:43 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Hi,

There is a common ground for the lights and the locks. I attached a few pics below. Check the grounds that I highlighted and let me know what you find.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find or if you have other questions.

Take care,
Joe
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Thursday, December 31st, 2020 AT 6:14 PM
Tiny
HAWKEYE 513
  • MEMBER
  • 2 POSTS
I don't understand the pictures you sent, only partial areas of the whole schematic were all there was. I need to know where to start looking for a bad ground since the headlights and power locks share the same ground. I really don't understand electrical schematics but may be able to figure out where to start. Would it also be possible to ground those circuits individually to make them work even if they are not together?
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Friday, January 1st, 2021 AT 4:00 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Hi,

The grounding locations are highlighted. When you look in the mentioned locations, you should find a group of black wires connected to a ground location.

As far as a new ground? Certainly, you can make a new one.

Let me know if I can help.

Take care,
Joe
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Saturday, January 2nd, 2021 AT 12:12 AM

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