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Max Online: 36273 @ 01/23/13 02:34 PM
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#12715571 - 04/13/18 04:38 PM Trailer running lights not working?
i-Fish Online   content
Extreme Angler

Registered: 06/07/16
Posts: 1024
The trailer brake lights and indicator lights work just fine but my running lights don’t. What gives? Any ideas?
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#12715572 - 04/13/18 04:39 PM Re: Trailer running lights not working? [Re: i-Fish]
Bass Buster1 Offline
Extreme Angler

Registered: 08/26/04
Posts: 1756
Loc: Denton
Usually ground issues with trailer lights. Each light should be grounded to the trailer and I ground the harness to the trailer. Some ground through the hitch and ball and if it is rusty or greasy it sometimes does not ground out good. You see trailers going down the road lights flickering with every bump, those are grounded through the ball.
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#12715573 - 04/13/18 04:42 PM Re: Trailer running lights not working? [Re: Bass Buster1]
K.D. Offline
TFF Guru

Registered: 05/04/02
Posts: 14462
Loc: Hurst, TX
Either a fuse in the tow vehicle or a ground issue. If I can’t troubleshoot it in a minimum amount of time I usually just rewire the whole trailer so I know it’s done right. Wiring harness is cheap and it doesn’t take much time.

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#12715582 - 04/13/18 04:48 PM Re: Trailer running lights not working? [Re: i-Fish]
blueduck Offline
Angler

Registered: 10/21/10
Posts: 315
Check vehicle fuses, then plug on vehicle, then pigtail if used before residing the trailer. I had problems for almost a year when we going the pigtail was bad.
_________________________
Dick Hairston
Vietnam VET, Purple Heart
PB: 11-2 (Big O,Florida)
Triton, Merc, Lowrance
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#12715584 - 04/13/18 04:49 PM Re: Trailer running lights not working? [Re: i-Fish]
blueduck Offline
Angler

Registered: 10/21/10
Posts: 315
Damn spellcheck, but you get the idea.
_________________________
Dick Hairston
Vietnam VET, Purple Heart
PB: 11-2 (Big O,Florida)
Triton, Merc, Lowrance
"Get the Net"

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#12715585 - 04/13/18 04:49 PM Re: Trailer running lights not working? [Re: i-Fish]
Texan Til I Die Offline
TFF Celebrity

Registered: 05/05/09
Posts: 7173
Loc: Deep in the Heart of Texas
These posts always amaze me. I could tell you what is wrong in 2 minutes or less if I was standing there with a volt meter, but if we start diagnosing it over the interwebs, it takes a minimum of 2 days and 6 pages to find the answer.
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#12715846 - 04/13/18 07:31 PM Re: Trailer running lights not working? [Re: Texan Til I Die]
dandeeks Offline
Angler

Registered: 04/06/14
Posts: 413
Originally Posted By: Texan Til I Die
These posts always amaze me. I could tell you what is wrong in 2 minutes or less if I was standing there with a volt meter, but if we start diagnosing it over the interwebs, it takes a minimum of 2 days and 6 pages to find the answer.


I get your point, why don't you just tell him how to troubleshoot with the volt meter as mentioned ?


Edited by dandeeks (04/13/18 07:31 PM)

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#12716001 - 04/13/18 08:54 PM Re: Trailer running lights not working? [Re: i-Fish]
Txmedic033 Offline
TFF Team Angler

Registered: 08/13/13
Posts: 4642
Loc: Longview, Tx
Check your vehicle fuses for trailer lights. Take the voltmeter and check your trailer plug to make sure it is getting power to the trailer and then and insert the red into the trailer wire while grounding the black on the trailer. Make sure your trailer lights are supposed to be on while you are doing this. I would start at the trailer tongue since it is both sides. If you have voltage there, try again at the lights and figure out where you are losing power. If you have 12 volts of power all the way to the lights then it is a ground issue. I would bet that it is a ground issue near the tongue since you don't have lights on either side.

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#12716109 - 04/13/18 09:52 PM Re: Trailer running lights not working? [Re: i-Fish]
armadillo joe Offline
TFF Guru

Registered: 04/22/05
Posts: 15642
Loc: Lake Fork
Mine did that and it was a fuse in my truck.

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#12716119 - 04/13/18 10:01 PM Re: Trailer running lights not working? [Re: i-Fish]
Robert Blair Offline
Outdoorsman

Registered: 09/25/03
Posts: 145
Loc: OKC ,OK , USA
Fuse on truck or connector, not a ground problem ( since the brake light’s
On the trailer use the same ground as the trailer running lights) the brake lights work, so they must have a ground.

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#12716527 - 04/14/18 11:34 AM Re: Trailer running lights not working? [Re: i-Fish]
stratosman201 Offline
Pro Angler

Registered: 12/08/04
Posts: 827
Loc: Ft. Worth
Fuse in truck. I have a 2007 Denali and just revolved the exact issue with a fuse. Does your tow vehicle happen to be a gmc? My fuse was labeled trlr park. Funny name but true.

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