Trailer Lighting
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Trailer Lighting
I have a 2011 F-150. I have towed a couple of trailers and had no issues with the lights. Then, I towed a single axle trailer and the lights have gone hay wire. I have blinkers and stop lights but no running lights. The fuses were checked and they are all fine. As far as the relays under the hood, i am not sure about those. First, how do you check those and i also found a Hi Power relay and 30 amp pink fuse in the glove box. Are these the ones i am supposed to be using when towing? Any help would be great.
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Is that true about the brakes? I thought the relay was only needed to charge the camper batteries. Pretty sure I never installed the relay and my trailer brakes work.
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From: Texas
The relay and fuse are only required for the trailer battery charge feature on the 7 way plug.
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I had no interior trailer lights or trailer brakes on mine until I installed the relays. No trailer connected was illuminated on the LCD until I installed the relays in my 2011.
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I was using the 4 way. The trailer lights worked on 2 other trucks, just not mine. I also used the 7 way with the 4 way adapter and had the same results. Prior to that i hauled my 20 foot v nose with the 7 way and brakes and it worked fine. I haven't hooked that trailer up yet to see what happened. So I should replace that relay and fuse either way right? And to be sure it is position 9 and 21 under the hood?
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ffblack,
Do you have factory installed TBC?
This is what I would do FWIW.
Use circuit tester to check the pins at the 7 way and 4 way plugs at the rear of the truck. Does the running light pin show a voltage?
If you dont get voltage or a light, keeping moving forward checking the security of the various connectors.
I haven't looked at 150's fuse box but i would bet there is a fuse labeled trailer running lights or something similiar. Replace that one and test again.
You are correct the trailer battery charge relay and fuse belong in position 9 and 21.
Do you have factory installed TBC?
This is what I would do FWIW.
Use circuit tester to check the pins at the 7 way and 4 way plugs at the rear of the truck. Does the running light pin show a voltage?
If you dont get voltage or a light, keeping moving forward checking the security of the various connectors.
I haven't looked at 150's fuse box but i would bet there is a fuse labeled trailer running lights or something similiar. Replace that one and test again.
You are correct the trailer battery charge relay and fuse belong in position 9 and 21.
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