Installing light bar

LILLICOTCH

MEMBER
2018 CHEVROLET COLORADO
15,000 MILES

Don't know what colors mean on wiring harness.
I have green, yellow, red, black, brown, blue, and white.
On the light bar I only have four which are green for right turn, yellow for left turn, white is the ground and brown is the running lights.

I think yellow goes to yellow.
Green goes to green.
White goes to black.
I don't know where brown goes.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi and thanks for using 2CarPros.

Before you do anything, lets make sure we know what you are attaching to. The first thing I need to know is what part of the vehicle you have found the wires you are referring to. On a schematic, wire colors can change from one point to another and still be part of the same circuit. I have attached all of the lighting/wiring schematics for the exterior of the vehicle. Some of the schematics had to be cut in two so I could fit them. They will follow each other and I overlapped them so you could follow them.

Take a look at these schematics. I picked a 4wd with the 2.5L engine. You didn't list one. If that is incorrect, let me know and I will review others to check for differences.

Let me know if this helps. Also, when you start looking for power wires, use a test light or multi meter to determine if you have the correct wire.

Here are some links you may find helpful:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

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

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Let me know what you find or if you need additional help.

Take care,
Joe

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