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Old 08-27-2015, 09:53 AM   #1
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Heater Motor switch not working

Heater motor wiring Question. 05 Winnebago 33V Voyage. I replaced the back up monitor In doing so I had to unplug several switches to access it, including the front heater switch which has a 4 plug electrical connector with black, purple, blue, and slightly larger black wires, in that order. I don't get any power to any wire, and the switch doesn't work. All circuit breakers and fuses have been tested and are working. I have printed off all pages of wiring diagrams from Winnebago but can't find anything on that switch or connector.
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Old 08-27-2015, 11:02 AM   #2
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Because the dash A/C heater system is a cross over , ( powered from the chassis ignition system but installed by the coach manufacturer) wiring diagrams can be difficult to follow ; or non-existent.
Have you seen the names ; Evans or Denso anywhere on the dash systems components, they are the common suppliers of the dash systems, and a wiring diagram from them may help.

I'll describe my dash system, ( and supplier/installer of parts) power set up and maybe it will help.
The ignition switch, ( Freightliner) , powers up an ignition system relay ( Newmar), the relay powers an in-line 12v circuit breaker, ( Newmar) that supplies the dash switch ( Evans installed by Newmar) . The dash switch supplies power to the fan motor through a resistor block that controls fan speed ( Evans ) and through an A/C low pressure sensor ( Evans) back to the chassis wiring harness ( Freightliner ) to power the compressor clutch on the motor , ( compressor mounted to the motor by Caterpillar).
Complex enough for you.
I'm thinking that some where , between the ignition switch and the dash fan switch you need to find an in-line fuse, that was blown when you had the wiring disconnected.
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Old 08-27-2015, 08:54 PM   #3
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Heater Motor switch not working

If you hooked everything back up properly and your still not getting power to the heater. Check your fuse box. There are fusible links in the wires that hook to the blower motor. Unlikely but a fusible link might have blown. I assume your not talking about your propane furnace, correct???😕 Make sure you don't forget about the fuses under the hood. As a general rule of mechanics, you should always disconnect the negative battery terminal - from the chassis battery before every working on anything electrical. Otherwise it is all to easy to short out the electrical system.

I installed a new light switch and couldn't get any power to the house section of my coach. I discovered a breaker switch was sticking. Unplug it from shore power, played with the switch a few times to get it to work right. I reconnected shore power and everything has been working fine since.


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Old 08-28-2015, 02:16 PM   #4
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Heater motor switch not working

I checked all fuses and circuit breakers under the dash,under the sink, behind the steps and in the engine area. All tested ok. Looked for in line fuses and found 2 which were ok.I'll check again for more in line fuses or breakers. Thanks for your input.
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Old 08-28-2015, 11:49 PM   #5
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Good luck with your search for fuse locations.
You are keeping notes aren't you ? Taking pictures ?
I've found fuses in 10 locations so far, in my coach , still not sure if I've found them all.
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