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Author Topic:   Trailer Lighting Problems
rafeek posted 07-25-2007 04:15 PM ET (US)   Profile for rafeek   Send Email to rafeek  
The running lights are not going on my boat trailer although the brake and signal lights are ok. [The author informs us he] bought a circuit tester from West Marine which is a $4 plug in gizmo which I plugged into the end of my Jeep's receptacle. It showed that the running lights circuit feeding the recptacle is not working. Any help will be apreciated.
jimh posted 07-25-2007 08:22 PM ET (US)     Profile for jimh  Send Email to jimh     
Test the "gizmo" on another vehicle which is known to work.
rafeek posted 07-26-2007 12:03 AM ET (US)     Profile for rafeek  Send Email to rafeek     
Turns out the module partially burned out, had it replaced with a new one:))
jimh posted 07-26-2007 09:25 PM ET (US)     Profile for jimh  Send Email to jimh     
In an effort to reduce weight and costs, some of the newer cars have tail light electrical wiring that cannot provide enough current to run the lighting circuits of a trailer. The additional current load of the trailer lighting circuits may be too much for your vehicle, if it has such a system. For those cases you have to add a special trailer lighting adaptor which has a separate feed from the vehicle battery. It uses the vehicle tail lights just as inputs and gets the current from the independent battery feed. This may be necessary in your case. See if the replacement OEM device you installed holds up.
Chuck Tribolet posted 07-26-2007 11:26 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
If the "module" is a diode pack to convert separate brake and
turn signals on the car (the turn signals are usually amber)
to the combined brake and turn signals used on simple trailers,
then a lack of ability of the care to supply current wouldn't
have burned it out. I'd be looking for a short to to ground
somewhere, most likely to the trailer frame.

BTW, some of those "gizmos" won't work if you have a "module".
The "module" reduces the voltage a couple of volts, and then
the "gizmo" doesn't work. I have a gizmo that didn't work
on my first truck, but work fine this one, both had a module.


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