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Old 04-01-2015, 01:07 PM   #1
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All lights good except running lights - why?

I'm hoping you folks can help me out here. My 2011 Rockwook Roo's turn signal and brake lights work, but the running lights and tail lights don't. I'm pretty sure my tow vehicle's wiring is correct and the problem is on the trailer side due to the fact that my diagnostic LED tool says it's correct, and when I hook up my vehicle to another trailer the running lights do work. I cleaned the connector to no avail. I tried to find a wiring diagram - no luck. Has anyone had a similar problem that can point me in the right direction? For example, does the running light circuit have a separate return to ground than the brake lights that may have become disconnected?
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Old 04-01-2015, 01:26 PM   #2
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Has to be broken/pinched wire as they use the same circuit. Have access to meter/test light? If trailer battery is charged, you can use a fuse-stat (automatic re-setting fuse), jumper trailer pig-tail plug, for power, so you can keep tv out of way. The running light ground depends on your siding material. Some lights use the attaching screws as the ground, and fiberglass needs a separate ground source. Finding the connections, where they are, is anybodys guess.
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Old 04-01-2015, 01:33 PM   #3
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There should be a wiring "junction" box just under the front of your camper.
Start there.

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Old 04-01-2015, 02:38 PM   #4
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We went round and round with this on our XLR last year. I had a electrician look at it - no luck. It took two trips to a very competent independant RV tech to solve the issue. Ours turned out to be a pinched wire at one of the tail lights. It was run incorrectly at the factory and after 2 years of use it failed. Our fault was intemittent.

The place to start is your junction box where the 7 wire connects to the unit. I hope you are lucky and find it there!
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Old 04-01-2015, 02:57 PM   #5
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Brake and turn signal lights use a different wire than lights. The lights are usually the brown wire at the plug so start there and work your way back.

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Old 04-01-2015, 02:57 PM   #6
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Step 1, feed +12VDC directly to pin 3 on the trailer connector. If holding it with square nub at 12 o'clock and terminals facing you, it's the pin at 1 o'clock. Put your house battery is in-place, then just bridge a 7.5A ATO fuse between pin 4 (11 o'clock) position and pin 3 - same way campers light the running lights while in the CG. If they work, you know your issue is on the TV side for certain, if not you are certain it's camper side. Step 2 is finding the break in continuity, and it would almost certainly be a break in the +12VDC with all lights out because lights are grounded locally in large part whether on aluminum siding or via screw/lug to chassis. Check trailer plug to junction box first as others said in hopes it's easy. If not report back for some advice in branch testing.
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Old 04-01-2015, 03:40 PM   #7
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Originally Posted by geotex1 View Post
Step 1, feed +12VDC directly to pin 3 on the trailer connector. If holding it with square nub at 12 o'clock and terminals facing you, it's the pin at 1 o'clock. Put your house battery is in-place, then just bridge a 7.5A ATO fuse between pin 4 (11 o'clock) position and pin 3 - same way campers light the running lights while in the CG. If they work, you know your issue is on the TV side for certain, if not you are certain it's camper side. Step 2 is finding the break in continuity, and it would almost certainly be a break in the +12VDC with all lights out because lights are grounded locally in large part whether on aluminum siding or via screw/lug to chassis. Check trailer plug to junction box first as others said in hopes it's easy. If not report back for some advice in branch testing.
Maybe start at the opposite end.
Step 1: Pop a running light lens off and check for corrosion (wiggle the bulb).
We had 4 not working last inspection. Contact cleaner and dielectric grease, now they all work all the time.

Although none of them working does sound like an open wire.
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Old 04-01-2015, 04:00 PM   #8
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You don't say what your TV is, but many trucks have separate fuses for trailer running lights and trailer brake/turn signals are also separate from the TV running lights. Look in you TV owners manual and check. My Trailer light fuses are in a totally separate fuse panel inside the truck.
He said he tried tv on another trailer and the lights worked on other trailer.

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Old 04-01-2015, 04:02 PM   #9
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Yup missed that detail
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Old 04-01-2015, 04:05 PM   #10
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Yup missed that detail
Well wake up!
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