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Show Parts for Model:

Cannot Get Blower Motor To Run-TW25

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09-17-2012 16:18:43

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Posted a while back about burning up blower motors on this TW25. As it turns out the motors were not bad. I hooked them up to a battery and they work. Someone said it might be the cab relay. I changed that and also the fan switch. Still no blower. Fuse is good, 12v to relay but no voltage to switch. What else could it be? Thanks!!

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09-18-2012 11:12:31

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 Re: Cannot Get Blower Motor To Run-TW25 in reply to soundguy, 09-17-2012 16:18:43  
That fan motor has multiple leads coming out of it for speeds IIRC. but no voltage at switch and voltage at relay means wire or bulkhead connector.
I pull wires out of bulkhead plastic and put a piece of heat shrink on them over the existing connectors. I usually pull all of them out as the bulkhead is crumbling anyway and cant be reused.. pull em out one by one on each side, remate them and shrink them as the connectors are still good. then silicon up the hole in the cab with the connectors pulled just inside..

otherwise cable is damaged going up to roof.

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09-18-2012 05:43:03

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 Re: Cannot Get Blower Motor To Run-TW25 in reply to RodInNS, 09-17-2012 16:18:43  
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This would be a good place to start.... I don't remember ever a blower switch being powered up by a relay,,, The switch would activate a relay normally to bypass a resistor for high speed operation only are a relay is used after the resistor ... Some switches provide power and some supply a ground you will have to figger that out...
A fan that works directly feed off the bat still may be bad you need to check amp draw if its to high the draw will burn up the control side of the blower...

Any thing over 15amps throws up a flag....

I goggled car blower motor circuit lots of info...

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09-18-2012 10:46:14

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 Re: Cannot Get Blower Motor To Run-TW25 in reply to Hobo,NC, 09-18-2012 05:43:03  
'Q' and 'Super Q' cabs have a power distribution or ignition load relay buried under the dash. It takes all of the heavy cab electrical loads. So... it can be bad. The bulkhead connectors that feed it can be bad. It will for all the world present itself as a bad ground when there's a problem in that circuit. The more loads you turn on, the weirder things get. Gauges act up, lights dim, etc. It's generally alack of ability to conduct current in that circuit.


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09-17-2012 19:43:55

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 Re: Cannot Get Blower Motor To Run-TW25 in reply to FOMOCO Farmer, 09-17-2012 16:18:43  
The main bulkhead multi-connector under the cab... This is the one with the 3 10ga wires. Probably got the green disease if it's not just burnt up.
Wire around it with blade connectors and seal it all with bead sealer or brush on tape.


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09-17-2012 16:57:28

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 Re: Cannot Get Blower Motor To Run-TW25 in reply to awhtx, 09-17-2012 16:18:43  
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No voltage to switch, means, cab relay is bad, or wire is bad or no voltage to primary of cab relay. You did check the fuse??

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09-17-2012 17:18:57

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 Re: Cannot Get Blower Motor To Run-TW25 in reply to sotxbill, 09-17-2012 16:57:28  
Yes fuse checked. I have 12 volt to all 3 terminals of the cab relay.

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