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Old Jun 10, 2007 | 08:52 PM
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Towing

I have a 2004 7.3L. When I hook up the trailer the turn and stop lights do not work. What can I check. It works when I hook it up to my Tahoe????
 
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Old Jun 10, 2007 | 09:00 PM
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maevans
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Try Double checking your connections https://www.ford-trucks.com/forums/5...g-diagram.html .
 
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Old Jun 10, 2007 | 09:00 PM
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which plug are you using
 
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Old Jun 10, 2007 | 09:03 PM
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7 way plug.
 
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Old Jun 10, 2007 | 09:06 PM
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have you cheched for power in 4 way
had a problem where harness was plugged into back of 7 way being corroded
 
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Old Jun 10, 2007 | 09:09 PM
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I seem to have power. the running lights work and the rear trailer lights work. They just don't blink or brighten when the signals are used or brakes are hit.
 
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Old Jun 10, 2007 | 09:11 PM
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I understand that but does signals work at 4 way plug
 
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Old Jun 10, 2007 | 09:15 PM
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I am not sure. I do not have anything that plugs into that. I guess I can take some reading with a meter. Thanks..I'll update tomorrow
 
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Old Jun 10, 2007 | 10:15 PM
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your heavy duty flasher module is burned out. It is in the powerblock under the hood, not the fuse block under the dash. It is a cube type plug in module. refer to towing supplement included with owners manula and it will give you a diagram. I am in my jammies now or I would go to my truck and tell you what the number on the mudule is. I had the same problem a cpouple of weeks ago and its like a $5.00 fix.
 
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Old Jun 10, 2007 | 10:26 PM
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Thanks for the help guys...I'll try it and let you know.Night
 
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Old Jun 11, 2007 | 08:26 PM
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Does the orange wire on the back of the truck plug have power to it,...Mine does Not.
I found the realy you were talking about and I am getting one tomorrow morning. I'll let you guys know if it works.

Thanks
 
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