Brake and Hot lead from 7 pin plug

[KUBSHACK]

I have a 2015 Coachmen Leprechaun 280DS, have 7 pin plug on rear everything is hot except Brake wire and Hot lead, they have wires installed but can not find where they are dead ended. I have had numerous people tell me different areas but have not found them yet. Coachmen says there are no wires run and talk to someone else and they say yes under the seat but I have yet to find the dead ends. 2 different techs from Coachmen where their build say different things along with talking to 3 or more Dealerships that all give me their input from they are hooked up and there must be a problem to under the dash to who knows where. I really think everyone is just flock shooting and I'am asking for any ones idea where I may search next, thank you for your help.

[KUBSHACK]

Thank you all for your input, after looking deeper into the wiring from Coachmen I would feel better running new wires to the plug for the Brake Controller and Power lead. I will run new 12 ga wire since all they run to the plug is 16 ga. thank you again.

[Butch50]

I don't know if the cab chassis are anything like the pickup but Chevy does not put a fuse in the hot line to the plug. Under the hood in the fuse box it was I believe fuse #1 and it takes a 40A fuse. On the brake wire I have no idea but the wire tuner is a god idea for tracing a wires.

[ronfisherman]

For GM trucks. Go to the GM Upfitter site. Download the appropriate manual for your Chassis. You will find electrical drawings that show location of wires/harness, connector pins and wire colors. Just about any information needed to make modification to your GM chassis.

[hotbyte]

JaxDad wrote:
Save all that searching, I'm betting it's a Ford chassis.

Read prior replies...he said it is a Chevy 4500

[eHoefler]

Check the fuse box, look for the trailer 30 amp. Most likely the spot is empty. Install the correct fuse, the hot lead probably will get power. Look for the brake controller pigtail, plug it in and wire in your controller.

[JaxDad]

Save all that searching, I'm betting it's a Ford chassis.

The reason? Ford don't install the relays that power the brakes or charge wire at the time the chassis is built.

All you need to do is install two relays in the under hood fuse box.

[navegator]

From the 7 pin plug the wire should go to the left side (drivers side) and run on the frame it is the the wire loom that powers the rear lights, some times there will be a plug on that loom for the trailer cables to hook up.

On some of the new vehicles this cables are either pre wired from factory or can be hooked to the unit under the dash, check with your manual for the location of where the dash wires are.

Some cables are run from the dash to the lower panel left side and then out to the frame trough a hole under the door plastic runner.

There should only be one hot wire, if more are hot there is a short along the wire loom, depending on the lenght of the RV, and it seems to be a 28 foot, they might have added a length of loom cable, check to see that the cable has not rubbed against the frame or that when the rear lights where installed they did not pinch a cable or the house cabin on the frame.

navegator

[Harvey51]

Maybe a wire tracer would be useful. A high frequency transmitter is connected to the wire and then a little receiver makes a sound when near the wire. I see them in hardware stores intended for use in homes.

[KUBSHACK]

Ok I have no wire to hook up for the Brake or the Hot lead they are run to the plug but can not be found on the frame to make final hook up was asking if anyone else had this problem with their Coachmen Leprechaun. This is a Chevrolet C4500 frame. I'm trying to find the wires to hook up.

[hotbyte]

Chassis? Ford or Chevy?

Do you have a brake controller installed? If not, you will not get voltage on the brake wire. Of course, we're assuming you are testing while pressing brake pedal.

By "hot" wire, do you mean the 12V charge wire? I've read some vehicles come with a fuse missing for this circuit. Also, depending on chassis mfr, you might need to turn the ignition key to "On" position. I believe it is Ford that usually shuts off this circuit when key is off.

[KUBSHACK]

Lets try this again the brake wire along with the hot lead are dead ended somewhere on the coach and no one can tell me where to find them to hook them up. They are run to the plug but no one can tell me where they are run to so I can make the final hook up.

[Grandpere]

OK, let's try this the simple way. First check to see if you have power at the brake controller. If you have power in and out then the controller is good. Just cut the output wire and splice in a new wire that you will run back to the 7 pin plug and hook it up. There is no sense to chasing a broken wire when it is much simpler to run a new one.

[ScottG]

Can you explain a little better; You have 12V to all the pins at the connector except the brake and hot lead?
Then you speak of "dead ends". I would expect there to be no power on those wires.
Maybe proof read your post and fix grammar.. thx.