Trailer wiring...what the?

[Zekester]

I know I did a search, found nothing on this quirk....

I'm wiring up my M101, the truck has a 7 flat prong socket...with 5 (?) posts being used, left right, tail, ground....and brake...I assume it's becuase the BJ40 has separate turn signals from brake lights.

I only have 4 in use on the 7 flat pin connector on the trailer...I know of some type of converter that does this, is this what i neeed? Can anyone explain what it does? What should the line up from the truck be? I'll drop the fifth wire and rewire it to four, but where do i pick up the brake circuit??

I know this is staring me in the face, but I can't see it

 

[Mud Shark Rosey]

Mike, the controller you're talking about converts the 3 light system on your truck to the 2 light system on your trailer. I have one on both my 40 and 62. I spliced mine into the wiring at the tail lights, leaving the controller in the truck and then running the trailer harness out the back.
Dave

 

[Zekester]

I've found a couple different ones online...from $6.95 to $79.95...are they different for 24 volts? what model/brand do you use?

 

[GLTHFJ60]

Isn't there a portion of the harness in the driver's rear quarter panel for hooking up trailer lights?

How does the controller work?

 

[Zekester]

The issue is that the 40 has separate brake lights and turn signals, so you have 5 wires, ground, tail, left right and brake. the trailer uses the brake and turn together, so you have 4 wires. The converter uses relays to send current from the battery to the right or left light, so you can use the four wire trailer, behind the 5 wire truck....

I have one installed now, but still having problems...