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trailer lights not working

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Old Jul 20, 2009 | 04:17 PM
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trailer lights not working
When i use a volt meter and test my trailer plug on the rear of the truck only the parking lights seem to get power. Nothing else seems to be getting any more power no matter if i try turn signals or brake lights.
 
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Old Jul 20, 2009 | 04:21 PM
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What year is your truck? Did your trailer lights work before?
 
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Old Jul 20, 2009 | 04:26 PM
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Don't forget that there may be fuses and relays under the hood also, depending on what year your truck is.
 
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Old Jul 20, 2009 | 04:28 PM
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Its a 2003 7.3.
 
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Old Jul 20, 2009 | 04:29 PM
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They did work last time that i used a trailer.
 
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Old Jul 20, 2009 | 04:30 PM
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All the fuses are under the dash on the 03's you will have seperate fuses for the trailer wiring. Do you have an owners manual with the fuse location?
 
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Old Jul 20, 2009 | 04:35 PM
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No i dont have the owners manual for my truck exactly but i have one for a 2006 which shows the same fuse box i think. I dont see many fuses for the trailer hook ups though.
 
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Old Jul 20, 2009 | 04:38 PM
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#20 is trailer tow/turn, #38 is trailer park lamps, #39 is trailer backup, #101 is trailer brakes, #115 is trailer battery charge.
 
Last edited by zx250; Jul 20, 2009 at 04:54 PM. Reason: Opps should say 115 on the last
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Old Jul 20, 2009 | 04:39 PM
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https://www.fleet.ford.com/maintenan...ls/default.asp
Hang on to this link, might come in handy.
 
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Old Jul 20, 2009 | 04:53 PM
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Well all the fuses check out good.
 
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Old Jul 20, 2009 | 04:57 PM
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Have a look under the truck where the trailer wiring harness plugs into your main harness and make sure it's not coming loose.
 
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Old Jul 20, 2009 | 05:05 PM
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yes i have looked and the thing thats weird is i have a 7 pin plus and the 4 pin plug and both only give power on the parking lamps pin.
 
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Old Jul 20, 2009 | 05:08 PM
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Then you have a blown fuse or a bad relay somewhere still.
 
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Old Jul 20, 2009 | 05:11 PM
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which relay is for the trailer towing lights?
 
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Old Jul 20, 2009 | 05:14 PM
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In the underhood fuse box on a 2000, you should check fuse #s 1 and 3. Be careful, the fuse locations on the lid of my underhood fuse box were printed backwards.
 
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