FIX YOUR TRAILER LIGHTS (1) - Checking the truck side plug

How to make sure the car/truck plug is working.  
TRAILER HARNESS CHECKER - https://amzn.to/3Pmv90d
TRAILER LIGHTS - https://amzn.to/43rDWUj
Troubleshooting the truck side plug.  How to fix your trailer lights.  How to fix trailer lights.
More on trailer lights - Trailer Lights
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