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Author Topic:   Trailer light pigtail-no power
RickB posted 01-07-2006 02:55 PM ET (US)   Profile for RickB   Send Email to RickB  
I have a 2000 Ford Explorer. I purchased a flat four wire trailer connector that plugs into a receiver behing the right rear tail light. The wire has no power nor the the receiver plug on the vehicle. All fused are ok under the hood and in the main fuse box.

What can I do next?

whalerwanter posted 01-07-2006 06:08 PM ET (US)     Profile for whalerwanter    
Is this trailer new to you? Are you fixing an existing problem.
Chuck Tribolet posted 01-07-2006 08:24 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
"No power" measured how? Voltmeter? Trailer?

Turn on the parking lights and the four way flashers while
you debug this.

If the voltmeter says no voltage between the truck side
male connector and any of the others, trace the wiring on the
truck back. Somethings unplugged or blown.


bsmotril posted 01-07-2006 10:11 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
On some vehicles, you have to add one or two additional plug in relays before the pigtail will function. They will plug into either the fuse panel under the dash, or the panel in the engine compartment for engine system fuses. Your vehicle owners manual should tell you for sure in the section about "towing". BillS
AZdave posted 01-10-2006 02:15 AM ET (US)     Profile for AZdave  Send Email to AZdave     
This is the stuff of Murphy's Law. I have been wrong about fuses. It's OK to check them twice.
Sometimes others have modified the wiring. Look for odd little tubes in the engine compartment that might have an added inline fuse.
Always use a voltmeter when tracking down gremlins. Lights will sometimes read good on a couple of volts. Only a meter willl tell you if relays or diodes are putting out greatly substandard voltage.
Don't be too impressed by "professionals" at a hitch or wiring place. They may well have less insight and tehnical expertise than you, and they will not admit it. This is routine in trailering. If I didn't have trailers, I would not have a chance to have cordial conversations with highway patrol officers. Good luck. Dave
bigjohn1 posted 01-10-2006 07:12 AM ET (US)     Profile for bigjohn1  Send Email to bigjohn1     
Rick, I just went through a somewhat similar problem. Although we have different tow vehicles, its possible the remedy will be the same. I'll bet your vehicle has a separate inline fuse panel solely for the tail lights. I did as you did and checked both under-hood and under-dash fuse panels to no avail. Once I located the third (and much smaller) fuse panel, there was my blown fuse. On my '04 Tacoma, it was beneath the rear seat.....go do some digging and see if you can locate yours. Easiest way I found was to get under the truck and physically "trace" the wire all the way back up to the cab.

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