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Old 06-06-2008, 01:42 AM   #1
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I am new to MH'g. Help! My MH has a four wire plug on rear for the cars Break Lights, Running Lights & Right/Left Turn Signals. I know I need to install Diodes to protect the cars wiring system. Question is how many Diodes are needed? Where is the best place to install the Diodes & cut into the car's wiring? I am at the point of running the wiring but do not no where to terminate? Every dealer I talk to tells a different story.
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Old 06-06-2008, 01:42 AM   #2
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I am new to MH'g. Help! My MH has a four wire plug on rear for the cars Break Lights, Running Lights & Right/Left Turn Signals. I know I need to install Diodes to protect the cars wiring system. Question is how many Diodes are needed? Where is the best place to install the Diodes & cut into the car's wiring? I am at the point of running the wiring but do not no where to terminate? Every dealer I talk to tells a different story.
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Old 06-06-2008, 05:39 AM   #3
paz
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Homeboy, welcome to iRV2.

My daughter's '04 Vue tail lights are like our '06, so your '05 should also be the same. If your Tiffin is like ours, you have separate turn signals and brake lights on your motorhome as well as on the Vue. This makes the wiring a little easier. I used 6 diodes - left tail light, left turn signal, left brake light, right tail light, right turn signal, and right brake light. If I could have found exactly where in the wiring the left and right tail lights and the left and right brake lights separated, I could have spliced in ahead of these points and possibly could have saved 1 or 2 diodes. But since I didn't know where those points were, it was just easier to use 6 diodes.

I cut into the wiring right behind the tail light assemblies. I then spliced in wires and ran them into the jack compartment on the driver's side and behind the trim panel on the passenger side. The trim panel has fasteners that just pop out.
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Old 06-06-2008, 09:12 AM   #4
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Thank you so very much for the information. Was your car plug/cable 4 wire? Do you recall as to how you split the 4 wire cable. I know the color coding and its use, but do not understand how you split the signal to to get the 6 function you describe? Is this done with jumpers between the diodes? The part that is confusing is that you are doing 6 functions with only 3 wires as the white wire is connected to ground.
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Old 06-06-2008, 03:16 PM   #5
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I'm using a 6-pin plug on the toad, but I'm only using 5 of the 6 pins - left turn signal, right turn signal, brake lights, tail lights, and ground. The brake light and tail light wires are split (jumped) to the left side after I got the wire to the back toad on the right side (or vice versa, I can't remember which side I ran the wires to first). Then I used a separate diode for each bulb filament (3 per side - turn signal, brake and tail). IMO, Roadmaster provides some pretty good info on toad wiring. I wired my toad according to their wiring diagram for wiring a motorhome with separate brake lights and turn signals to a toad with separate brake lights and turn signals.

I didn't pay any attention to wire colors. I plugged the coiled electrical cable into the back of the motorhome and used a test light to verify which pin was which on the 6-pin (toad) end of the cable. I then wired up the 6-pin connector on the front of the toad accordingly.
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