2003 excursion OEM trailer connection issue Please help!! - Ford Powerstroke Diesel Forum
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Old 10-29-2012, 06:49 AM
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Exclamation 2003 excursion OEM trailer connection issue Please help!!

Ok here is my issue- 2003 excursion when plugged in to my travel trailer the left blinker and left brake light do not work on the trailer but they work on the ex. Here is what i have done.
I tested the trailer side by hooking up my dad's truck and every thing worked like it is supposed to. I then got my multimeter and tested the truck side on the corresponding pins for the blinker on both sides. With the right blinker on; the multimeter reads 12.0 v when it blinks on and then zero when it blinks off ( which is correct to my knowledge).
The left blinker reads 12.0 v when it blinks on and 10.3v when it blinks off. The problem is definetly the pin for the left side of the tow vehicle trailer connection. At first i thought it might be a ground issue but both the right and left side share the same ground pin and the right side reads like it should but the left side does not. Any suggestions or tips would be greatly appreciated.
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Old 10-29-2012, 07:35 AM
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The trailer circuits have seperate fuses for the trailer and left and right. That would be the first thing I checked.
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Old 10-29-2012, 07:44 AM
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Where would said fuse be located. My first thought was that it was not a fuse because Im getting power and voltage readings from that pin but i will try anything to fix this. Thanks for your time
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Old 10-29-2012, 07:54 AM
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Should be under the steering Collum in the fuse panel, I don't remember what number it is, you'll have to look in your owners manual to find it.
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Old 10-29-2012, 07:57 AM
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Automotive lighting systems can be a pain because everything back feeds an gives all kinds of crazy readings while testing.
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Old 10-29-2012, 12:57 PM
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Check the wiring on the truck side of the plug, reads like you are shorting between your turn/brake and another wire, seen this happen fairly often on recepticles only takes a liitle touch from one wire to pop a bad coonection.
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