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Old 12-23-2014, 11:44 AM   #1
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Running lights not working... Truck side or trailer side?

The running lights on my Swift 154bh have stopped working. But the blinkers and brake lights still work.

I can run a jumper wire from the 12v terminal to the running lights on the trailer plug and the running lights work. If I leave the jumper wire in the plug and I connect the trailer plug to the truck, everything works fine (except the trailer lights stay on all the time).

Is it a problem on the truck side or the trailer side?

Any ideas what the problem could be? A corroded ground somewhere?

Thanks for the help. This just started and we're heading out for Christmas in a couple days. Local service dept is closed.
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Old 12-23-2014, 02:55 PM   #2
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I would start with the electrical plugs trk/trl. Check this site http://www.etrailer.com/faq-wiring.aspx
Also most auto parts stores have an inexpensive pin tester that you plug into your connectors will tell you if everything is working and can save you a lot of trouble. Good luck.
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Old 12-23-2014, 03:37 PM   #3
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EVERYTIME I hook up to my dads flatbed trailer to move the tractor... I blow the running lights fuse under the hood of the pickup.

Like clockwork, I need to replace the fuse before towing the camper.

When troubleshooting, always start at the simplest point of failure, and work your way into the most complex.
8 times out of 10, its a blown fuse, 1 times is a loose ground, and the last 1 times is the camper.
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Old 12-24-2014, 06:37 AM   #4
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Agree with ctbailey, check the underhood fuses on the truck. There is normally a seperate fuse for the trailer lights. If that fixes it, then fails again, there is a short in the wiring of the trailer somewhere.
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Old 12-24-2014, 06:50 AM   #5
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Agree with ctbailey, check the underhood fuses on the truck. There is normally a seperate fuse for the trailer lights. If that fixes it, then fails again, there is a short in the wiring of the trailer somewhere.
It has to be on the truck side. They work if he puts a jumper in place.
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Old 12-24-2014, 07:13 AM   #6
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it will be a fuse under the hood. You didnt say what kind of truck you have. However our Chevy lot truck blows these things about once a week. Our FORD lot truck blows them about every two weeks. We dont have a Dodge truck, but we get several inquiries, so I assume that Dodge blows them frequently also.
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Old 12-24-2014, 09:22 AM   #7
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Since they work when you use a jumper wire it is the truck side... Since you have not posted what kind of truck you own it is hard to say much more.. but it has to be a fuse somewhere I am betting..
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Old 12-24-2014, 07:17 PM   #8
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Quote:
Originally Posted by livefree View Post
The running lights on my Swift 154bh have stopped working. But the blinkers and brake lights still work.

I can run a jumper wire from the 12v terminal to the running lights on the trailer plug and the running lights work. If I leave the jumper wire in the plug and I connect the trailer plug to the truck, everything works fine (except the trailer lights stay on all the time).

Is it a problem on the truck side or the trailer side?

Any ideas what the problem could be? A corroded ground somewhere?

Thanks for the help. This just started and we're heading out for Christmas in a couple days. Local service dept is closed.
Hello You are Right down the road from Me ,What is your Tow Veh > ??
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Old 12-25-2014, 10:33 AM   #9
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Now I have a Dodge Truck for many years and pull all kinds of trailers and I have never blown a fuse. Must be living right!
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Old 12-26-2014, 09:47 AM   #10
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Thanks for all the helpful replies. I've narrowed the problem down to the circuit protector box that the Reese dealer installed.

There's power going into the box when I turn the running lights on, but no power coming out of it. I checked all other lights the same way and they work fine.

I can't find any info about the "Super Duty Circuit Protector" online. Any idea what would cause it to go out? Possibly a bad one or some other problem in the wiring?
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Old 12-26-2014, 09:49 AM   #11
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Oh, I'm pulling it with a 2002 Toyota Tundra V8 with 80k miles. I checked all my fuses and they're all good.
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Old 12-27-2014, 08:04 PM   #12
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I always keep my plug coated with die electric grease. It helps keep corrosion from getting in the plug. It could be a bad ground put a jumper cable from the truck frame to the trailer frame where you have no paint like a bolt head. If the lights come on you have a bad ground.
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