While trying to figure out if my brake controller was alive I think I shorted something out. Furnace isn't turning on. A/C and fan do still work. Found this burned wire front and center when I took the furnace cover off. The blue wire connected to the left side of the pink connector leads to the control board. If the board is fried can you see it? And isn't there a fuse in the furnace (back behind)? If so, what is the path the current travels? Does the location of this wire tell you anything about what else is likely affected?

My guess is that you just had a poor connection within the terminals. Cut the wires back to where they are clean and replace both of the terminals.

cannesdo wrote:While trying to figure out if my brake controller was alive I think I shorted something out. Furnace isn't turning on.I'm unclear as to how you're associating the brake controller and the trailer's furnace. :h The brake controller wiring doesn't have anything to do with the trailer's internal 12 vdc system ... it's powered by the tow vehicle and it's output is routed to the trailer's brakes, nowhere else.

There should not be enough current on that line to do that- the blue should come from the thermostat, split in 2- one blue going to the board, the other to the limit switch which is on the other side of the furnace (inside the coach).

Lynnmor wrote:My guess is that you just had a poor connection within the terminals. Cut the wires back to where they are clean and replace both of the terminals.My thoughts too. Faulty connector crimps create resistance to current flow which results in hot connections.

What does this burned furnace wire tell you? | Good Sam Community

49 Replies

cannesdo
Explorer
Feb 24, 2016
SoundGuy wrote:
cannesdo wrote:
While trying to figure out if my brake controller was alive I think I shorted something out. Furnace isn't turning on.

I'm unclear as to how you're associating the brake controller and the trailer's furnace. :h The brake controller wiring doesn't have anything to do with the trailer's internal 12 vdc system ... it's powered by the tow vehicle and it's output is routed to the trailer's brakes, nowhere else.

The truck was hooked up to the trailer in order to do the tests. No idea how that could have sent current into the furnace but the timing is suspicious.
3oaks
Explorer
Feb 24, 2016
BB_TX wrote:
Mont G&J wrote:
Lynnmor wrote:
My guess is that you just had a poor connection within the terminals. Cut the wires back to where they are clean and replace both of the terminals.

My thoughts too. Faulty connector crimps create resistance to current flow which results in hot connections.

Agree. Wires don't looked burned, just overheated enough to melt insulation. Clean and replaced as noted above.
My first thoughts also.
Larry-D
Explorer II
Feb 24, 2016
Use some dielectric grease on the terminals to help cut down on corrosion and will help provide a good connection
BB_TX
Nomad
Feb 24, 2016
Mont G&J wrote:
Lynnmor wrote:
My guess is that you just had a poor connection within the terminals. Cut the wires back to where they are clean and replace both of the terminals.

My thoughts too. Faulty connector crimps create resistance to current flow which results in hot connections.

Agree. Wires don't looked burned, just overheated enough to melt insulation. Clean and replaced as noted above.
Mont_G_J
Explorer
Feb 24, 2016
Lynnmor wrote:
My guess is that you just had a poor connection within the terminals. Cut the wires back to where they are clean and replace both of the terminals.

My thoughts too. Faulty connector crimps create resistance to current flow which results in hot connections.
Chris_Bryant
Explorer II
Feb 24, 2016
There should not be enough current on that line to do that- the blue should come from the thermostat, split in 2- one blue going to the board, the other to the limit switch which is on the other side of the furnace (inside the coach).
SoundGuy
Explorer
Feb 24, 2016
cannesdo wrote:
While trying to figure out if my brake controller was alive I think I shorted something out. Furnace isn't turning on.

I'm unclear as to how you're associating the brake controller and the trailer's furnace. :h The brake controller wiring doesn't have anything to do with the trailer's internal 12 vdc system ... it's powered by the tow vehicle and it's output is routed to the trailer's brakes, nowhere else.
Lynnmor
Explorer II
Feb 24, 2016
My guess is that you just had a poor connection within the terminals. Cut the wires back to where they are clean and replace both of the terminals.
downtheroad
Explorer
Feb 24, 2016
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What does this burned furnace wire tell you?

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