02-03-2018, 03:01 PM
Join Date: Mar 2009
Location: Georgetown, Guyana
Tow vehicle and towed vehicle wiring are very different.
When a vehicle is set up to tow, the tow wiring harness is intended to pass power from the tow vehicle circuits to the towed vehicle circuits, which may be a trailer with no power supply of it's own.
When a vehicle is set up to be towed, the tow wiring harness is intended to accept power from the tow vehicle circuits and route that power to the rear lights of the towed vehicle without allowing that power to "back feed" into the remainder of the towed vehicle's lighting circuits.
Your Samurai will have tow vehicle wiring, not towed vehicle wiring.
In addition to the above, consideration has to be given to circumstances where the two vehicles are wired differently - Samurais have four separate rear light circuits that need to be considered, the "running" lights, the stop lights and the left & right turn signals circuits - to power these as designed requires a minimum of five conductors, if the tow vehicle uses a similar rear light setup.
Note that - if the tow vehicle uses a similar rear light setup - many US built vehicles (your dually is US built - isn't it?) use a single lamp filament for both turn signal & stop lights - these can be routed through a four pin connector to the towed vehicle but if the towed vehicle uses separate turn signals, as is the case with the Samurai, the turn signals will not flash, and both stop lights will flash when the tow vehicle signals a turn in either direction, unless you get creative with the Samurai wiring.
So - onto my first question - what is your experience level with electrical wiring - specifically automotive electrical wiring - if I had to guess it would be little to no experience, if it was different, you would have known where the pitfalls were before you asked the question.
Second question - do you still think it's "overkill"?
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