trailer wiring
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Mountain Pass
Joined: Dec 2006
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From: Andreas,Pa
trailer wiring
here we go 2006 f350 when I hook the trailer up I have brakes and a right turn signal thats all no running lights or left signal all fuses are good in the underdash panel and also inthe the under hood fuse box. Just wanted to see if there was anything stupid I was missingbefore I start chasing wires. plug on truck is new lights worked fine up until about a month ago thanks
Cargo Master
Joined: May 2006
Posts: 2,116
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From: Florida
here we go 2006 f350 when I hook the trailer up I have brakes and a right turn signal thats all no running lights or left signal all fuses are good in the underdash panel and also inthe the under hood fuse box. Just wanted to see if there was anything stupid I was missingbefore I start chasing wires. plug on truck is new lights worked fine up until about a month ago thanks
Cargo Master
Joined: May 2006
Posts: 2,116
Likes: 6
From: Florida
All American Trailers - Trailer Wiring Diagram
I have diagnosed my share of trailer wiring problems, they are really simple to fix once you have the diagrams and a test light or DVOM
I have diagnosed my share of trailer wiring problems, they are really simple to fix once you have the diagrams and a test light or DVOM
New User
Joined: Dec 2012
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Trailer wiring
Hello,
Just had a similar problem. Found the circuit board in the main fuse box (Under the hood) has soldered relays for the trailer connector pemnanantly attached to it. One relay controls running lights and the other controles brakes and turn signals. Dealership wanted $600.00 to replace the whole board. Went to the local U Haul dealer and had old school trailer harness wired directly into the existing harness (The way is used to be done before all the technology). Total cost for parts and labor $93.00. Good luck
Just had a similar problem. Found the circuit board in the main fuse box (Under the hood) has soldered relays for the trailer connector pemnanantly attached to it. One relay controls running lights and the other controles brakes and turn signals. Dealership wanted $600.00 to replace the whole board. Went to the local U Haul dealer and had old school trailer harness wired directly into the existing harness (The way is used to be done before all the technology). Total cost for parts and labor $93.00. Good luck
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Mountain Pass
Joined: Dec 2006
Posts: 181
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From: Andreas,Pa
ok here we go the plug on the truck is new I replaced it when I bought the truck last yeardue to the green on it.
I checked each terminal all I have is reverse lights and right turn signal. Left turn signal is putting out 3-4 volts everything else is dead.
where do I go from here as stated previously all fuses that I know of where removed and visually inspected thanks
I checked each terminal all I have is reverse lights and right turn signal. Left turn signal is putting out 3-4 volts everything else is dead.
where do I go from here as stated previously all fuses that I know of where removed and visually inspected thanks
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Unplug your seven way from truck wiring harness and check at truck wiring harness side for voltages present for running lights, brake lights, and L/R blinkers.
Also don't be surprised to find corrosion again after a year. Clean any corrosion from male/female pin connections if present.
If truck wiring harness side checks good, clean any corrosion if present on pins, reconnect and try same checks at seven way again.
Also don't be surprised to find corrosion again after a year. Clean any corrosion from male/female pin connections if present.
If truck wiring harness side checks good, clean any corrosion if present on pins, reconnect and try same checks at seven way again.
Fleet Owner
Joined: Apr 2012
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From: Spanaway
Engine side power box (BJB)
BJB F1.9 right is C1187 Left is C1188
look for F1.9 near it you will see 4 relay spaces and the 2 above F1.9
F1.20 trailer tow connector 7-pin
In Cab (CJB)
Trailer tow charge relay left center top in CJB C2110
trailer tow parking relay F2.38 lower edge 5th over from center right counting left
In this linked PDF you will find the CJB and the locations of the relays
http://www.frybrid.net/ford_02_fuses_wiring.pdf
I could not find a diagram for the BJB there should be one in the owners manual.
Sean
BJB F1.9 right is C1187 Left is C1188
look for F1.9 near it you will see 4 relay spaces and the 2 above F1.9
F1.20 trailer tow connector 7-pin
In Cab (CJB)
Trailer tow charge relay left center top in CJB C2110
trailer tow parking relay F2.38 lower edge 5th over from center right counting left
In this linked PDF you will find the CJB and the locations of the relays
http://www.frybrid.net/ford_02_fuses_wiring.pdf
I could not find a diagram for the BJB there should be one in the owners manual.
Sean
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