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Member
Posts: 22
Location: Bellevue, NE | Just purchased a brand new trailer and having a problem already. I'm in contact with the dealer, but wanted to ask here too. I only have lights when the brake pedal is applied or turn signal on. Same issue no matter if I plug trailer into receptacle in bed or on bumper. It is a 7-way plug. Inside lights do work. Later today I plan on hooking up to someone else's trailer and having them hook up to mine, to help rule out my tow vehicle. Thanks! |
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Veteran
Posts: 203
Location: Lander WY | Have you had issues with your tow vehicle?? I suspect a crossed wire in the trailer plug. |
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 Veteran
Posts: 175
Location: Florida | If Swapping tow vehicles doesn't do anything, take a jumper cable from your truck frame to the trailer frame and see what that does. |
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Expert
Posts: 5870
 
Location: western PA | Ditto. It sounds like a bad or improperly wired ground wire. Not all manufactures provide the same 7 pin plug that is often used, so their wiring may differ from the "normal" RV wiring. On some trailers is posted a decal that shows the function of each wire in the plug. You can cross reference this to your truck's receptacle. |
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Member
Posts: 22
Location: Bellevue, NE | We had friend hook up to our trailer and everything worked correctly, then we hooked up our truck to her trailer, and had same problem, so problem is with the truck. Tried to check fuses but they are not what I am used to, so will need to get a tester I think. Prior to this last test, we opened the trailer plug and electrical box and compared to diagram in the owner's manual and everything looked fine. Will check to be sure truck's wiring is correct too. Thanks everyone! |
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Expert
Posts: 3853
 
Location: Vermont | Who installed the truck plug? |
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Member
Posts: 22
Location: Bellevue, NE | Paul, the truck is brand new, so the bumper plug and fuse box were installed by Ford at the factory. But, we had the dealership install a turnover ball and plug in the bed at time of purchase. The plug on the bumper AND the plug in the bed, both illicit same response. No running lights at all, but brake lights and turn lights work when brake applied or turn signal turned on.
Edited by billnchristi 2013-08-25 12:02 PM
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Expert
Posts: 3853
Location: Vermont | Originally written by billnchristi on 2013-08-25 12:01 PM
Paul, the truck is brand new, so the bumper plug and fuse box were installed by Ford at the factory. But, we had the dealership install a turnover ball and plug in the bed at time of purchase. The plug on the bumper AND the plug in the bed, both illicit same response. No running lights at all, but brake lights and turn lights work when brake applied or turn signal turned on.
Did you check the marker light fuse under the hood?
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Member
Posts: 22
Location: Bellevue, NE | Yes, it was a square, black fuse, not the kind I'm used to where you can visibly see inside to see if the filament or whatever is broken. No way to see inside this one. Guess I need a tester or take it to the dealership and have them test all the trailer related fuses. |
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Expert
Posts: 3853
Location: Vermont | Originally written by billnchristi on 2013-08-25 9:55 PM
Yes, it was a square, black fuse, not the kind I'm used to where you can visibly see inside to see if the filament or whatever is broken. No way to see inside this one. Guess I need a tester or take it to the dealership and have them test all the trailer related fuses. You sure that it's not a dummy fuse? |
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Member
Posts: 22
Location: Bellevue, NE | I have no idea, Paul. I wouldn't know what a dummy fuse looks like. There were several that looked like that (square, black, enclosed, insides not visible). And others that were smaller but still square, but multi-colored (different amperage?). Most of the fuses in there were not the kind I'm used to seeing (thin, two blades, visible filament). I will probably just take it to the dealership. It has barely been over 30 days, so it shouldn't cost me anything. Hopefully. |
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Elite Veteran
Posts: 807
Location: Tenn/Ala. | The black thing is a placeholder, not a fuse. There usually is a fuse in the glovebox packet with instructions on where to install it for trailer towing. May even be more than one.
PS- The fuses are colored, according to amperage ratings. |
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Member
Posts: 22
Location: Bellevue, NE | The owner's manual calls the square black fuses, "cartridge" fuses. |
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Veteran
Posts: 203
Location: Lander WY | Cartidge fuse seem to be a genric term ... See link below perhaps that will help ?....................................................................................................................................https://www.google.com/search?q=dummy+fuse&hl=en-US&espv=1&tbm=isch&tbo=u&sboxchip=Images&source=univ&sa=X&ei=t-EbUv2TDYOsjALqnoHgBw&ved=0CCwQsAQ&biw=320&bih=461 |
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Lights only when brake or turn signal applied
