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Concert connoisseur
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2,231 Posts
Discussion Starter #1
ok, its not vn related but I just got a boat and the trailer lights do not work. I would like to eliminate my truck as the problem, it has a reese hitch and wiring harness I have not used in the 7 years I have had it.
can I test the outputs of my truck with my voltmeter and how. it is a 4 wire system. white, yellow, brown, and green. what do I set the vm at and which wires do I test. thanks a lot!
 

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and the Adventure Cycle
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6,141 Posts
The Reese line of trailer accesories includes a test plug for the 4 prong plug. You simply plug it into the trailer harness on the truck, and if all the lights are lit up, all is OK with that wiring. It also acts as a cap to keep dirt & stuff outta the plug.
Check it out at the bottom of THIS page, on the left side

If ya don't wanna go that route, just set the DVM to (usually) 20 volts.
White is usually ground. Don't remember off hand what the others are, but if ya put your running lights and emergency flashers on, all the other wires should get voltage. The turnsignal/brake wire will only get intermitent voltage, as they are flashing, but as long as you see any voltage comne through, they are working.
 

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Concert connoisseur
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2,231 Posts
Discussion Starter #3
thanks I'll give it a go!
 

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CWO3 Navy (Retired)
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722 Posts
GROUND! Whenever trailer lights don't work check your ground connections. A rusty bolt will stop you dead. I use stainless steel bolts for my ground connections and switched to LED lights, which has been a major improvement.
 
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