I need a firewall plug pinout?

Tiny
DP1
  • MEMBER
  • 1995 CHEVROLET 1500
  • 5.0L
  • V8
  • 2WD
  • MANUAL
  • 170,592 MILES
My 95 obs is confusing me! I cant find the pinouts I need that match my truck. My truck is ls swapped with a psi harness and computer. My truck also still has the original engine harness for the use of oil pressure sensor, coil wires and under hood fuse box im guessing so that my factory guages work. I bought the truck like this and everything worked great until I decided I was going try and clean the engine bay up a little by eliminating left over connectors from original harness that I thought I didnt need. Long story short, now my truck turns over but wont fire. I jumped the fuel pump relay and I could hear it but still no fire. I think I may have accidentally cut out a coil wire or something. My truck is a manual and has a t56 but for some reason it has an auto cluster. Can you please help?
Monday, June 9th, 2025 AT 4:50 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,612 POSTS
Sure, I can help, can I ask which year car did the LS come out of so I can look up the wiring for you? Here is the firewall bulk head connector pin out to help get us started. Check out the images (below). Please upload pictures or videos in your response.
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Tuesday, June 10th, 2025 AT 5:55 PM
Tiny
DP1
  • MEMBER
  • 2 POSTS
2002 camaro. I actually figured out the issue. I had accidentally stuck my ignition relay wire in the wrong slot inside the cab. I found it and its now running again with all factory guages working!
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Sunday, June 15th, 2025 AT 9:15 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,612 POSTS
Sweet! Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Sunday, June 15th, 2025 AT 10:28 AM

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