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Old 08-23-2015, 07:31 AM   #1
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Wiring for toad

Hopefully someone can help with this. I installed roadmaster universal wiring kit on 2010 SRX along with the converter for separate turn/brake lights (2 wire to 3 wire). Using the Blue Ox 7 way to 6 way I plugged into a F-150 (motorhome was in for service) and everything seemed to work (the running lights did not but it was determined the plug-in on the truck side was at fault, no power when checked with test light and multi meter).

We get to campground after picking up motorhome and plugged in wiring to check lights and nothing. No turn, stop lights or running lights. When I started looking at motorhome I see there is a converter close to the receptacle taking 3 wires to 2 wires. Initially I thought the motorhome had combined lights so the converter was installed in the SRX to split the turn/stop signal for the separate lights. Evidently the motorhome and SRX are separate systems.

My question, will 2 converters play nice with each other in this setup? The converter mounted on the motorhome combines the signals (3 to 2 wire) and the converter mounted at the back of the SRX splits the combined signal to separate (2 to 3 wire).

Trying to get it figured out so DW doesn't have to drive home.....
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Old 08-23-2015, 09:21 AM   #2
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It would probably be a good idea to get a voltmeter to see what is actually coming from the MH. From what you said, I would guess it was wired for a combined toad. That is what the converter on the MH is for. Once combined, the lights cannot be "uncombined". A converter (wired backward?) on the toad probably doesn't do anything good.


You could remove the converter on the MH and the toad and wire without any converters. You will need 6 diodes for this installation.


I suppose you could wire the toad as if it were combined and use the converter on the MH, but none on the toad. The brake lights on the toad would act as turn signals when operated from the MH. Do nothing to the wires for the turn signals on the toad. They should operate as normal when driving the toad, but not function when connected to the MH.


Roadmaster has some nice wiring diagrams (as supplied by eTrailer)
https://www.etrailer.com/Tow-Bar-Wir...er/RM-154.html
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Old 08-23-2015, 12:43 PM   #3
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Thanks Dave, checking further I had no power for tail lights, turn or stop at the 7 blade on back of MH. Checked wires before they got to converter, no power. Checking the fuses, no blown fuses, no power either side with them plugged in. Only thing I can think of right now is relay's that feed the fuses but have a hard time believing 5 of them are bad.??????
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Old 08-23-2015, 01:47 PM   #4
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Well, there was one blown 7.5 amp fuse, replaced and now have proper power at connector on MH, will find out when we hook up car if I need to take converters off MH and car for everything to work correctly.
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