Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Used when a motorhome is towing another vehicle by way of a tow bar. If the towing vehicle has a 2-wire system and the vehicle being towed is on a 3-wire system (the vehicle has amber turn signals, separate from the brake signals), the vehicle to vehicle taillight converter will need to be used. This item cannot be installed backwards (the input going to the output side) to convert a tow vehicle down.
Note: The tail light isolating diode system (38955) will need to be used with the converter (118158) to prevent power feedback.Replaces 31820
Video of Vehicle to Vehicle Taillight Converter
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
This is a taillight adapter which will convert your two wire system on your towing vehicle up to a three wire system to your towed vehicle. Certain applications will be say, your RV has a four wire system on it or maybe a five wire system converted down to a four wire but your towed vehicle has separate turns signals and brake lights. You would use this box to convert it back up to that at the rear of the vehicle. Well cover a few technical points on how it actually gets installed. Well show you how it typically gets installed, the nuts and bolts of it. Its a little bit easier than you think. Basically were going to use this four pole wire harness as a model here, this is going to be the lead thats going up to the RV or towing vehicle. What happens is you have the four wires obviously, the ground, running lights, and turn signals.
These are going to be inputs on this side of the box labeled input. Basically youre going to do it color for color if you notice youre going to have the brown wire left out. That doesnt have to be changed or anything that can go straight out to your taillights. Chances are youre probably going to have to split this to go to the left and right side taillights. To recap, this is going to be color to color on that and this will go up to your RV. On the opposite side here, where its labeled output this actually gets connected to the wire harness itself on the towed vehicle. These will go right behind the taillights, so for instance on the left hand side your yellow will get connected to the left hand turn signal. The same thing for the green except it will go to the right. If you notice on the stop signal theres one wire, again youre going to, just like the running light, split this off to the left and right stop light signals. Other than that, its a pretty simple install, it looks complicated but if you take it step by step, its going to be pretty easy to do. As a final note, this is a heavy duty relay unit which may be mounted at the rear of the towed vehicle to facilitate wiring. There you have it for part # 118158 the Tow Ready Taillight Adapter.
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Average Customer Rating: 
3.5 out of 5 stars (2 Customer Reviews)
by: Henry J05/04/2011
Is this review helpful?
I mounted a juction box on the front of the trailer and connected my 4-wire trailer connection to it. From this box I ran a ground wire to all lights and to the convertor input, the green right turn/stop to the convertor input, the yellow left turn/stop to the convertor input, the brown to my tail lights, license plate light, marker lights and clearance lights. I ran the 3 wires from the convertor output to another juction box. I connected the green right turn to the right amber light, the yellow left turn to the left amber light, the red brake to the red right and left brake light and the third brake light. No diodes needed. I'm using your Bargman LED Double tail light Red and Amber and Bargman wraparound clearance/side marker red on rear amber on front. You people at etrailer are "THE BEST". I believe you are the only outfit that knows your products and can tell us how to install them!12888
by: Kevin S.08/09/2011
Is this review helpful?
Very disappointed. Between the Left turn/stop, and the Left turn only there is a 90 degrees phase change. In other words the turn only lights do not blink at the same time as all my other lights that have turn/stop. This also applies to the right turn signal too. The only thing that works like I wanted is the stop only wire.21451
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