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07-23-2015, 06:21 AM
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#1
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1 Rivet Member
Holland
, Michigan
Join Date: Jul 2015
Posts: 5
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blinkers working opposite of tow vehicle
I have a 2005 Yukon that tows a '67 globetrotter. Typically when I tow the trailer I switch the lights from "auto" to "on" and that turns on the trailer running lights and everything works as it should. Last night I hooked up and the trailers blinkers work opposite of the truck, the running lights dont come on, and the brake lights dont work. If I switch the truck lighting to "auto" the blinkers work correctly but running lights and brakes still dont work.
Any advice on how to trouble shoot would be greatly appreciated. Thanks in advance for any help!
Best,
Joe
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07-23-2015, 07:23 AM
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#2
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Rivet Master
1991 34' Excella
Princeton
, New Jersey
Join Date: Aug 2003
Posts: 7,070
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This test is for a 7 terminal plug system with flat terminals. If your trailer has round terminals you may have to check the wiring positions but the test will determine where the problem is.
With a voltmeter test for voltage on the connector at the bumper of the TV as follows.
While the turn signals are on.
The terminal at 3 o'clock should be the right turn signal.
The terminal at 9 o'clock should be the left turn signal.
If this is correct your trailer connector is wire wrong. If it is not correct your TV connector is wired wrong.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles
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07-23-2015, 07:25 AM
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#3
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Rivet Master
, Minnesota
Join Date: Aug 2003
Posts: 7,721
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This happened to me once. I'd put the 7-way plug into the socket upside down.
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07-23-2015, 08:06 AM
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#4
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1 Rivet Member
Holland
, Michigan
Join Date: Jul 2015
Posts: 5
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Thanks for the replies.
The plug is keyed so I cant physically plug it in upside down.
I know its wired correctly because its been working properly for the past 5 years...and nothing has changed since last time i used it a month ago?
Perhaps a ground wire issue?
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07-23-2015, 08:08 AM
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#5
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Rivet Master
, Minnesota
Join Date: Aug 2003
Posts: 7,721
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My plug was keyed also, but it was possible in the dark to put it in upside down. Cheap plastic.
Sent from my iPhone using Airstream Forums
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07-23-2015, 08:25 AM
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#6
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Rivet Master
Currently Looking...
Vancouver
, British Columbia
Join Date: Oct 2012
Posts: 4,592
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I would be checking the ground circuit. Also, check the trailer bulbs to make sure they are making good contact. It sounds like the circuit is being grounded through the other bulb contact, explaining the lack of all lights except when the turn signals are on.
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07-23-2015, 08:44 AM
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#7
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Rivet Master
2006 25' Safari FB SE
Spokane
, Washington
Join Date: Sep 2009
Posts: 1,859
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Howie has it right. Go to "the 12 volt side of life" and you will find the schematic for wiring up a 7 plug. Check your vehicle first. It is very likely that your trailer is wired incorrectly.
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07-23-2015, 08:48 AM
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#8
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Rivet Master
2006 25' Safari FB SE
Spokane
, Washington
Join Date: Sep 2009
Posts: 1,859
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No Diagram
Sorry, the 12 volt side of life did not have the schematic for your connection.
This one will
https://www.etrailer.com/faq-wiring.aspx
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07-23-2015, 12:31 PM
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#9
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4 Rivet Member
1966 24' Tradewind
2005 22' Safari
Bastrop
, Texas
Join Date: Aug 2012
Posts: 329
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my 2 cents go with the bad ground being the culprit , simple test , simply ground your trailer to your vehicle with a jumper cable "frame to frame" and see if this erases the problem . if it does, check where your ground wires actually connect to trailer and tow vehicle .
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07-23-2015, 02:01 PM
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#10
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Mrfixit
Vintage Kin Owner
Bathurst
, New Brunswick
Join Date: Jun 2015
Posts: 65
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Most likely a ground problem. With a bad ground other lights will illuminate that are not supposed to. Happened a lot on older vehicles, with bumper attached signal lights.
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