Brake and turn signal not working at the trailer plug

[Divide Wee]

I have turn and brake lights at the back of the motorhome and power to the running lights on the trailer. I have not been able to check the power to the trailer brakes just yet.

There is no power to the right and left side turn signal pins on the motorhome plug.

This is a Winnebago and there is a bundle of 10 or so yellow wires running toward the front of the frame but no way to differentiate which is which.

Is there a fuse somewhere that would power only the turn and brake lights or is there a way that a bad flasher would cause problems with the brake light circuit as well as the turn signals.

Thanks in advance for any help
Mike

[l1v3fr33ord1]

Mike-

What year and model Winnie do you own?

Winnebago supplies wiring diagrams via this Web site:

Wiring Diagrams

I'd start by downloading the set for my coach and finding the circuits feeding the rear signals through the plug.

Mark

[Divide Wee]

It's a 2007 29R.

The diagrams don't seem to help much as it is hard to determine exactly where the various connectors are. Due to the wires all being the same color, size and with the same markings, it is hard to trace them back to their source.

I was hoping someone may have been trough this themselves and might have a possible solution or a place to look for the break in connectivity.

[grtharris]

Divide Wee, look at the drawings in the link below sheet 3. Each of the yellow wires has a wire number on it. The last 2 or 3 letters correspond to the wiring diagram. Follow the other link to the wire id guide and wiring diagram help. There is separate fuses for the trailer plug.

http://www.winnebagoind.com/diagram/...ire_156369.pdf
Wiring Diagrams

[l1v3fr33ord1]

It appears the diagram for which gtharris provided a link contains pages for motorhomes built on both the Ford and Workhorse chassis:

Sheets 1 and 3: Ford chassis ("FD")
Sheets 2 and 4: Workhorse chassis ("WH")

So, Mike, which chassis does your 29R use?

With that information we can help you work back through the diagrams, if you haven't found the cause already with gtharris' note on the numbering.

I understand Ford wiring from working on our former Class C, but am willing to do the detective work on the Workhorse side if needed.

Mark

[l1v3fr33ord1]

Mike-

If it's a Ford chassis, the fuse you want to check can be found in the Power Distribution Box (PDB), position 22. See page 15 of the attached file.

I can't tell you where to find the PDB on your coach, but I expect it will be under the hood, on the right (facing the rear), or under the dash, on the left (facing the front), mounted to the firewall (not the one behind the driver's kick panel door).

That fuse feeds one relay each for the left and right side trailer lights. If you have a chassis manual in the pile you got with the coach, it should tell you where those relays are, either on the Power Distribution Box or the Ford Fuse Panel (also shown on page 15). Of course, if the fuse is the problem and you replace it, you should hear those two relays clicking (and the trailer lights blinking) and find them that way (for future reference).

If it's a Workhorse chassis, never mind!

Mark

[Divide Wee]

It is a Ford chassis.

I can't seem to find the second fuse panel with the #22 slot. It is not under the hood and I may have to disassemble the dash to get to it when I finally locate it. There is a removable section behind the dash display but I can't see any panel from there. I will remove the driver seat to get a better angle at the bottom of the dash but can't see anything as of yet. I find it hard to believe that Winnebago would hide a fuse panel this well.

[l1v3fr33ord1]

Mike-

Don't take the seat(s) out. I'm looking at the documentation now, but until I get an answer there I'd bet with 90+ percent certainty that the PDB is inside the engine compartment.

Mark

[l1v3fr33ord1]

Mike-

There are several relays in the PDB. Try this: Open the front hood. Have someone turn the headlight switch on and off. Listen for the trailer running lamps relay to open and close. Find the source of the clicking sound and you should find the PDB.

Mark

[l1v3fr33ord1]

Mike-

From another iRV2 thread:

"For those who may encounter this same problem - the centre (underhood) fuse panel which is labeled power distribution centre is locked closed by a tab located on the right side at the lower edge. Although the cover is clearly labeled PULL with arrows indicating direction, the cover lifts outward from the right. The fuse is #22 and is a MAXI type."

Still looking for a Winnebago drawing that shows where they installed the PDB. I hope these latest posts help, in the meantime.

Mark

[l1v3fr33ord1]

Mike-

I believe this iRV2 thread has pictures of the PDB, in post #7:

http://www.irv2.com/forums/f120/elec...em-196913.html

Hopefully, your coach's is in the same spot under the hood.

Mark

[l1v3fr33ord1]

Mike-

I couldn't resist one more link. It's got a crystal-clear photo of the inside of the PDB AND its auxiliary relay box.

Power Distribution Box Schematic? - Ford Truck Enthusiasts Forums

I'll shut up now. ;-)

Mark

[Divide Wee]

Mark,

Thanks for the info but the PDB is not what I need to find. I have looked in there and the Maxi fuse at #22 is a 40 amp fuse and is fine.

The running light relay is in the small box to the left of the PDB and is functioning properly. I swapped all three of the small relays around and all are functional so it doesn't appear to be the relay that is bad.

The #22, 20 amp, fuse I need to find is in the Fuse Box which I have yet to find the location of. There is a large group of wires run into three large connectors on the upper divers side on the engine compartment side of the firewall. It would be logical that the fuse panel would be on the other side of the firewall above the breaker panel at the bottom of the dash but I can't find the darn thing.

I have access to the top of the dash area but not the bottom. I guess the next order of business is to remove some panels and get a better look. I have reached into the area and can't feel anything that would appear to be a panel large enough to be what is illustrated in the wiring diagrams.

[grtharris]

Divide Wee, here is the location fuse panel you are looking for.