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01-17-2018, 11:08 AM
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#1
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Junior Member
Join Date: Jun 2008
Location: Tiffin
Posts: 19
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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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2017 Tiffin Open Road 34PA
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01-17-2018, 11:31 AM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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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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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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01-17-2018, 11:46 AM
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#3
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Senior Member
Join Date: Dec 2017
Location: Charlotte, NC
Posts: 532
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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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2002 American Eagle 40M
ISL400 / Spartan MM
2003 Jeep Liberty/2019 Jeep Trailhawk
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01-17-2018, 07:36 PM
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#4
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Senior Member
Join Date: Feb 2013
Location: Graham, WA
Posts: 772
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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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2006 Gulfstream Friendship G7, Cat C7 and Allison 6 spd
Honda VTX and Cruiser Lift on the back
Blue Ox Aladdin, Brake Buddy, 2019 Chevy Blazer RS toad
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01-17-2018, 07:52 PM
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#5
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Senior Member
Monaco Owners Club
Join Date: Oct 2014
Location: Rigby, Idaho
Posts: 3,902
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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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Cheers,
TonyMac
2006 Monaco Safari Cheetah 40PMT
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01-17-2018, 08:51 PM
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#6
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Location: Bastrop Texas
Posts: 1,343
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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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2000 Allegro Bus 35R 3126 Cat 300 Allison 3060MD 6 speed
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01-18-2018, 06:34 AM
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#7
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Senior Member
Join Date: Dec 2017
Location: Charlotte, NC
Posts: 532
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I was merely referring to the converter diagram not the coach itself.
Safe travels.
__________________
2002 American Eagle 40M
ISL400 / Spartan MM
2003 Jeep Liberty/2019 Jeep Trailhawk
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01-18-2018, 07:05 AM
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#8
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Mar 2007
Location: Home on the hill in Georgia
Posts: 2,742
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If you do[n't have one you can buy one. Got mine from Amazon
ATTACH]189171[/ATTACH]
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Jerry Potter, Taz
1999 Coachman Catalina Sport
[SIGPIC][/SIGPIC]
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01-18-2018, 09:51 AM
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#9
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Junior Member
Join Date: Jun 2008
Location: Tiffin
Posts: 19
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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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