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Trailer plug wiring issue

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  #1  
Old 08-05-2007, 02:19 PM
jim reed
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Default Trailer plug wiring issue

Can anyone out there help me? I have no power to my left turn signal and left brake light for my trailer plug, i have checked fuses, they are good, i have even traced the wire up to the fuse box (integrated power module) According to the schematic that i have the power runs thru a relay. which is called the trailer tow left turn relay. there is no relay marked as such in the fuse box. where can i find this relay. Has anyone had this problem also? 2004 diesel 2500. thanks
 
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  #2  
Old 08-05-2007, 02:36 PM
Twoforme2
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Default RE: Trailer plug wiring issue

are you using the four pin or the 7 pin plug?
are you sure there is no power, or is the light on the trailer just not lighting up? (I know a stupid question, but important)
 
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  #3  
Old 08-05-2007, 02:39 PM
jim reed
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Default RE: Trailer plug wiring issue

mine has both 4 and 7 and i already tested my trailer lights and they work. truck turn signals also work, but not on my yellow left turn/ left brake wire for my plug
 
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  #4  
Old 08-05-2007, 03:13 PM
Twoforme2
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Default RE: Trailer plug wiring issue

well I am looking at the 2005 (I dont have a 2004 book, not sure how different it would be) wiring diagram and it looks like that yellow wire goes to a "trailer tow-left turn" relay which should be in the IPM, powered by fuse #46
 
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  #5  
Old 08-05-2007, 03:17 PM
Twoforme2
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Default RE: Trailer plug wiring issue

yuou know looking at the picture it does not specifically label those relays, could it be one of the two at the bottom next to the Park lamp relay???
 
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  #6  
Old 08-05-2007, 04:13 PM
jim reed
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Default RE: Trailer plug wiring issue

i wish the trailer tow relay was visible in the box, the park lamp relay is there, i really dont want to take it to the dealer my 36000 warrenty is long gone. i am almost ready to splice into the truck signal and brake wiring.
 
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  #7  
Old 08-06-2007, 12:43 AM
Twoforme2
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Default RE: Trailer plug wiring issue

I found this in the manual
The trailer tow relays are located in the Power Distribution
Center (PDC) in the engine compartment near
the battery. Refer to the layout label on the underside
of the PDC cover for specific relay cavity assignment
information. A trailer tow relay cannot be adjusted or
repaired and, if faulty or damaged, the unit must be replaced

 
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  #8  
Old 07-02-2010, 10:04 AM
herbt
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Default trailer tow relay

Has anyone found the location of this relay? I have the same problem with my left brake and signal light on my trailer.
Truck lights are fine. No power to the trailer plug terminal for left turn and brake.

Herbt
 
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  #9  
Old 07-05-2010, 12:40 PM
jason_blocker
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Default

I've got a 2006 with the same issue in both my 7pin and my 4 pin . tempted to just jumper off of my trucks taillights any thought on that
 
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  #10  
Old 07-06-2010, 08:55 AM
herbt
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Default trailer plug wiring issue

I am convinced there is no relay for the trailer turn and brake lights.

I have already jumped the left turn signal from the truck light wire to the wire going into the 4 pin connecter because it is easy to find. this backs the signal into the 7 pin and now the trailer turn signals work fine when the trailer is plugged into the 7 pin.

I am thinking about doing the same for the brake signal but i think the only draw back is that both of the truck left tail lights will light when the brake is applied instead of just one. I dont know if that would cause a state inspection problem.

This seems to be a fairly common problem with dodge trucks. Has anyone contacted dodge about a known repair?
I think it is in the splice comming off of the wiring harness but thats hard to get at.

Herbt
 
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