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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis SPONSORED BY:

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Old 04-03-2011, 09:12 PM
2kcrewcab 2kcrewcab is offline
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2008 f250, no trailer lights but brakes work

I hooked up a buddy's trailer that had been in a field during a brush fire. It sustained minimal damage but some of the wiring got melted. Well now my trailer light plug has no power for any lights. The brakes work fine but no lights, not running, braking, or signals and there is no power at the plug for lights. I assumed fuse, but checked the ones that I thought they could be and they were fine.

I would assume the trailer lights shorted out and blew a fuse but I checked all of them with a test light and didn't find any blown. Any relays?
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Old 04-04-2011, 09:15 AM
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there ARE two sets of fuses.. one in the right kick panel area too.. altho I haven't seen those blow out..

is there a bad ground at the trailer plug?

Sam
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Old 04-04-2011, 09:26 AM
2kcrewcab 2kcrewcab is offline
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Possibly, but wouldnt that affect the trailer brakes also? With a test light at the plug, there is 0 power except on the brake pin when brakes are applied.

Any idea what fuses for sure control the trailer lights? I checked all of the fuses in the.kickpanel and all the ones I thought could be right under the.hood
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Old 04-04-2011, 09:30 AM
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this manual (online copy) http://www.motorcraftservice.com
at page 300
lists all the fuses.

note there is a lamp RELAY too..

Sam
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Old 04-04-2011, 10:05 AM
2kcrewcab 2kcrewcab is offline
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Thanks, ill take a look when I get home.
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Old 04-04-2011, 10:10 AM
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I would also suggest hooking up to a known good trailer as an easy method to check your truck and fuses.
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Old 04-04-2011, 10:18 AM
2kcrewcab 2kcrewcab is offline
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Ya, I did use 2 separate trailers and both the bumper plug and the bed plug. Both have the same issues. Both trailers the brakes worked and.both pkugs had no lights
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Old 04-04-2011, 10:32 AM
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Originally Posted by 2kcrewcab View Post
Ya, I did use 2 separate trailers and both the bumper plug and the bed plug. Both have the same issues. Both trailers the brakes worked and.both pkugs had no lights
wait.. new news.. BED plug..

did you actually check in the wiring harness BEFORE the bed plug connection?

Sam
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Old 04-04-2011, 10:36 AM
2kcrewcab 2kcrewcab is offline
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Both plugs worked a month or so ago before I hooked his trailer up.
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Old 04-04-2011, 10:38 AM
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Both plugs worked a month or so ago before I hooked his trailer up.
understood.. no power at the plugs.. fuses seem good.. check the relays.. I think there is one you can swap.. maybe the brake relay for the light relay.
then check the connection for the bed plug..

Sam
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Old 04-06-2011, 03:11 PM
2kcrewcab 2kcrewcab is offline
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ok, so I am JUST getting to troubleshooting this. Sam, i tried clicking on your link above and it says i do not have permission to the site and need to login again?

Does anybody know which relay is the lamp relay?
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Old 04-06-2011, 03:19 PM
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Originally Posted by 2kcrewcab View Post
ok, so I am JUST getting to troubleshooting this. Sam, i tried clicking on your link above and it says i do not have permission to the site and need to login again?

Does anybody know which relay is the lamp relay?
gr.. I hate that site.. I fixed the link.. then u have to pick guides in the left nav, and ...

relay 42 is trailer park lamp relay, 44 is the trailer battery charge relay

Sam
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1955 F100 460/c6, 3.55ls - 436 hp, 489 tq
2012 F350 4x4, DRW, 3.73ls, CC, LB, 400 hp, 800 tq
2013 Keystone Alpine 3720FB 5th wheel. 40', 15,500gvwr
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Old 04-06-2011, 03:23 PM
2kcrewcab 2kcrewcab is offline
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Thanks, heading out now to check it out!
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Old 04-07-2011, 06:04 AM
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Quote:
Originally Posted by 2kcrewcab View Post
I hooked up a buddy's trailer that had been in a field during a brush fire. It sustained minimal damage but some of the wiring got melted. Well now my trailer light plug has no power for any lights. The brakes work fine but no lights, not running, braking, or signals and there is no power at the plug for lights. I assumed fuse, but checked the ones that I thought they could be and they were fine.

I would assume the trailer lights shorted out and blew a fuse but I checked all of them with a test light and didn't find any blown. Any relays?
Where's your owner's manual? It would have all information about fuses, relays and breakers.
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Old 04-07-2011, 06:04 AM
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