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Old 01-17-2018, 12:08 PM   #1
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Motorhome trailer wiring question

My son bought a 1999 32' Holiday Rambler Vacationer motorhome. When I test the trailer plug I correctly see Run, Right Turn, and Left Turn but when I test Brake only the left comes on continuous. Right does not come on even for Right Turn when Brake is activated. The MH has separate turn and brake lights so I'm wondering if there is a module in the MH wiring to convert that to combined Turn and Brake at the trailer receptacle? Is that module defective? Thanks in advance for any advise.
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Old 01-17-2018, 12:31 PM   #2
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If the RV has separate brake and turn signals, then you most likely have a module. Where it's located, is anybody's guess. I'd start at the connector at the bumper and start tracing the wires from there. Often the module is kept close to the plug so the installer doesn't have to splice extra wire lengths.

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Old 01-17-2018, 12:46 PM   #3
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You can also pull up lots of trailer/toad wiring diagrams on the web for separate/combined lighting. I would think the conversion module is the culprit if all your MH lights work correctly without trailer hooked up. If you hook up trailer/toad and lights stop working you may have a bulb in tow lights shorting out signal.
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Old 01-17-2018, 08:36 PM   #4
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Check for blow fuse. I have fuses for all lines to the connector. Took me awhile to find as they are in a box marked Buss.
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Old 01-17-2018, 08:52 PM   #5
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The module, and yes, you must have one, is between the MH lights and the plug. Trace UPSTREAM from the trailer wire that runs your left and right signal/brake light. These two wires will go to the module. You may find that the output of the module to your right signal is open. If so, repair the open or run a new wire in its place. The module is likely a small black box about the size of a Zippo lighter.
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Old 01-17-2018, 09:51 PM   #6
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Seems like the RV industry just ignores standard color coding and finding the components is always difficult to say the least. I have found it much simpler to just tie into the wiring at the lights for Tail, Right and Left Turn, Backup and run new to a brake controller and aux. You can do that in half the time it take to find a wiring diagram.
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Old 01-18-2018, 07:34 AM   #7
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I was merely referring to the converter diagram not the coach itself.

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Old 01-18-2018, 08:05 AM   #8
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If you do[n't have one you can buy one. Got mine from Amazon
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Old 01-18-2018, 10:51 AM   #9
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Thanks everyone. I figured there had to be a module but wanted to confirm it. Now off to locate it. ☺️
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