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Old 04-29-2014, 07:21 PM   #1
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Dash (Defrost) Fan Fuse/Electrical Issue - Damon Outlaw

I'm totally stumped and hoping someone on here will know this answer. I have a 2007 Damon Outlaw on the Ford V-10 chassis. Due to a roof leak on the driver's side, water intruded into the overheads and drained into the driver/side fan. I rebuilt the cabinet, sealed the roof, addressed the leak, etc.

The problem: before the fan gave up the ghost, it took out a fuse...somewhere....and I cannot find it. According to the electrical diagrams, it is on the Battery Control Center (a 15amp fuse). But I've checked ALL of those and they are all powered/good. And there are WAY more fuses on the diagram than on the BCC under the hood. I've checked all the fuses inside by the driver's foot, and the chassis battery center. I've found several other fuses in-line with other systems...are the cabinet mounted Dash (defrost) fans similarly wired? If so, where is the little monster? I'm stumped and about to resort to hard-wiring the switch/fans on a separate fuze circuit.

Also, this may/may not be related. About the same time the dash fan quit, the 'high-speed' on my A/C blower (dash rotary switch) became in-op. Low/low-mid/hi-mid all work; turning it to 'high' results in the blower shutting off. The rotary switch itself is electrically functional. I have read elsewhere that the high-speed on some A/C dash fan motors uses a relay as the current load would exceed the rotary switch. Is it possible the same fuse that feeds the dash fans ALSO energizes a similar relay?

Surely appreciate any help or suggestions.

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Old 04-30-2014, 02:43 AM   #2
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Check ground conductor or just add one to be sure it has a complete path. The fans are fused at the BCC and by the sound of it the fuse is OK but the ground side may not be. Good luck and keep us posted.

Mike, RVIA & RVSA Certified Master RV Technician
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Old 04-30-2014, 04:57 AM   #3
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My 2008 has a switch on the dash that starts BOTH fans. Does the passenger side fan work? JM2...
Ted Fulltiming in the DreamCatcher a
2008 Challenger 371PE on F53 w/ 2010 Cobalt
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Old 05-01-2014, 09:56 PM   #4
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The over dash fans on my Outlaw are powered by the chassis battery and both are common to one circuit. If one was out, but the other is still running, then there is a short in the wires vs. a fuse.

If they are both out, then it's probably a fuse.

If it is a fuse, there will be no power at the in-dash switch.

Time for a circuit tester to find where the power stops. It's possibly a bad ground too, since there is no good chassis ground anywhere near the top of the front cap.

I use one of these (cheap and easy) to chase 12VDC power:
Circuit Tester

Best luck
Kim and Steve, Mustang LCDR (USCG Ret), Outlaw #1193
"I have seen gross intolerance shown in support of tolerance", S.Coleridge 1797
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Old 05-02-2014, 06:32 PM   #5
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I guess I should have said that both Fans were inop since they are. I was trying to avoid using the signal tracer to find the circuit. The ground on both sides is good so I'm suspecting a bad fuse or connection. Previously, the A/C blower would stop after hitting a bump. That turned out to be a badly crimped wire on the back of a connector under the dash... I found it by the 'wiggle' method of wiggling wires until I found one that matched the blower cutting out. Guess I'll have to trace the fan wire back to the source. I know it is supposed to be on the BCC, but which fuze?

Anyone have any ideas on the inop high speed A/C switch? Is it a relay?

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damon, dash, electrical, fan, fuse

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