Lamar Trailer Wiring Diagram

Here are a two common questions about trailer wiring and their answers.

*wiring harnesses information may differ by wiring brand*


Where do the points on the harness plug go?

4 Way Plug

Yellow - left turn/stop

White - ground

Brown - running lights

Green - right turn/stop

4 way plug harness diagram

7 way plug

Brown - running lights

Red - auxilary

Green - right turn/stop

Middle - back up lights

Black/blue - electric brakes

White - ground

Yellow - left turn/stop


7 way wiring harness diagram

How do I test to see if my 7 way plug is working?

Grab any conductive two pronged tool and insert it into the top two terminals on your 7 way plug that are your 12 volt and running light terminals. If your lights turn on, your fuses are good, your battery will charge and your lights work.


Where can I buy a replacement 5amp trickle charger and tester?

Etrailer has one online here https://www.etrailer.com/Battery-Charger/Bright-Way/BRW77FR.html

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