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ContinuousWave: Small Boat Electrical
Trailer 7-Pole Circuit to Truck 4-pole Circuit
|Author||Topic: Trailer 7-Pole Circuit to Truck 4-pole Circuit|
posted 08-13-2012 10:18 AM ET (US)
I am trying to connect the 7 wires coming from my trailer to a 4 wire plug. Help. Thanks
|Tom W Clark||
posted 08-13-2012 11:42 AM ET (US)
You can simply buy a 7 to 4 adapter but this disable the auxiliary 12 volt power, electric brake signal and backup lights signal to the trailer.
If your trailer has electric brakes you'll need to convert your tow vehicle wiring to accommodate the 7 wires of the trailer.
posted 08-14-2012 12:17 AM ET (US)
The truck apparently only has three circuit: running lights, left turn, and right turn. The trailer has six circuits. You can only connect the three circuits of the truck to the appropriate three circuits of the six on the trailer.
You may find that my article on 7-pole trailer-truck wiring will be helpful. See
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