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Jerry, Master Mechanic
Category: Dodge
Satisfied Customers: 1754
Experience:  ASE Master tech, 30 years exp. troubleshooter, driveability tech
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Just bought a dodge 2003 hemi with 3/4 ton & installed

Customer Question

Hi: just bought a dodge 2003 hemi with 3/4 ton & installed tekshona brake in order to pull horse trailer.
Here is the question- when we plug the trailer in (and yes the plug fits) to the truck: all the lights work on the trailer with the exception of the left brake light- and the left turn signal light. The right works fine, as do all the running lights.
Was thinking this was a wiring issue in the dash- but was told it was a computer chip/integrated brake controller issue? Thanks
Submitted: 1 year ago.
Category: Dodge
Expert:  bill replied 1 year ago.

with the trailer brake unplugged do the trailer lights work properly? second did you use the FACTORY plug and play adapter harness or wire it differently

Customer: replied 1 year ago.
when the trailer is plugged into the truck- all the running lights work, the right blinker and brake light work. The left brake light and left blinker do not. The female portion of the plug is what came with the truck. The male portion (trailer plug) did not give us any issue when we pulled same trailer with different truck.
And no, the lights did not work properly before we installed the trailer brake: we did have to order a special dodge cable to be able to hook it up- but as I said- the brake installation made no difference to the light issue. Thanks
Expert:  bill replied 1 year ago.

can you send along the vin so i can pull the trailer wiring diagrams, can you read and follow a diagram if i send along a link to one, and yes there is a factory harness that was provided with the truck to install a trailer brake control