Hardwiring a Brake Controller on a 2015 Ford F-350 Cab and Chassis with Adapter Plug Missing

Question:

I have the primus iq trying to hook up to my 2015 f 350 couldnt find the plug behind the dash .took it to the ford dealer they couldnt find it either.they are telling me they will have to pull the dash board out I have a pig tail I would just hard wire it but they couldnt even tell me what wires to use could you tell me what wires to use to hard wire thanks

asked by: Gregg B

Expert Reply:

The plug for the brake controller unit should have been plugged into the back of the coin holder, as seen in the attached video starting at the 4:36 minute mark. From the attached video it appears to have 9 wires bundled together, so this would be what you want to look for within the wiring down below the dash. To properly hardwire the brake controller you will want to use a circuit tester like # PTW2993 and test for function, and then splice to the corresponding brake controller wire.

The pin that has voltage all the time will be the 12 volt power circuit (goes to red wire), the pin with 12 volts of power only when the brake is applied is the power wire (goes to black wire). Now you will need to test to determine which is ground.

Ground the tester to the constant 12-volt power wire, then probe the remaining two wires. The wire that lights the tester will be the ground (white), the other will be the brake output circuit (blue).

I have attached a few Help Articles to this page for your convenience.

expert reply by: Jackie C