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07-11-2002, 09:57 PM | #1 |
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Join Date: Jun 2002
Location: North Idaho
Posts: 43
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fan switch wiring? HELP
please help -
question: I can't get the fan to blow - but the relay clicks (until the fuse blows 15-20 sec.) how do I wire my blower fan switch? or could something else be going on? background: when I got the truck the wire plug at the switch was melted - and so was the switch. I've replaced the switch, the resistor & the relay. I couldn't get 12v from the 18g brown wire that was at the switch so I ran a new fused 14g wire to the switch for power. that leaves me with a thick 14g yellow, a thin 18g yellow with red stripe(assuming it would be the orange one in the diagram), and a thinner 18 or 20g light blue wire. I've tried connecting them as per the diagram but the fan won't run - just a clicking relay. I put a jumper from the batt to the fan and it turned fine (although the jumper wire got very hot) what am I missing (besides the skill to find this problem)? one wiring diagram I got says there are 5 wires? the diagram in my haynes manual says there are 4? please see attached pic and comment. thanks in advance J |
07-11-2002, 10:15 PM | #2 |
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Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,269
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Had similar problem which was solved when GMC Paul told me to re-do the grounds --both at the heater relay and at the fan motor. I suspect that if the jumper wire to the heater is getting hot----you have a grounding problem. Is this an A/C truck?
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07-11-2002, 10:15 PM | #3 |
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Join Date: Oct 2001
Location: Southern New Mexico
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To start I would try to run the same gage wire all the way.
Lemmie check my factory manual. |
07-11-2002, 10:45 PM | #4 |
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Location: Southern New Mexico
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Here is what I found under my dash.
#1 Yellow #2 Orange #3 Brown #4 Lt Blue |
07-11-2002, 10:58 PM | #5 |
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Join Date: Oct 2001
Location: Southern New Mexico
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Just confirmed from the factory manual. What I have is correct.
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07-11-2002, 11:07 PM | #6 |
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Location: Southern New Mexico
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Here is a Pic
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07-11-2002, 11:34 PM | #7 |
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Join Date: Jun 2002
Location: North Idaho
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thanks all!
Huck it's an AC truck- grounds are all ok (bypassed them with jumpers) RipMeyer thanks for the pic I just hooked it up according to what yours is #1 Yellow #2 Orange #3 Brown #4 Lt Blue see pic and the fan runs in the 2nd click from the top(position 3?), but nothing at the 1st & 3rd click from the top(position 2 & 4) the relay clicks loudly and the 4a fuse I had inline blew (replaced with 15a) ideas??? |
07-11-2002, 11:35 PM | #8 |
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Join Date: Jun 2002
Location: North Idaho
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this is what I have for wires...
the blue one is shorter because the end was burnt |
07-12-2002, 12:15 AM | #9 |
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Location: Southern New Mexico
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After looking at the diagrams the only thing I could suggest is the Resistor, Relay and the Switch. Seeing as you already replaced those, maybe you fried one of them when it was hooked up wrong. Switch is more than likely ok but the resistor and the relay may have been damaged.
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07-12-2002, 11:01 AM | #10 |
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Location: North Idaho
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wierd -
I re-connected the wires to the switch, re-re-checked the grounds and this time it works. YAHOOOO no I just wait for the duracool to show up so I can charge this baby and go. today's high forcast at 110. It's not suppesed to get this hot in Idaho. anyway, thanks for the input RipMeyer & Huck - it helped to get the wires plugged in to the right spot. |
07-12-2002, 06:58 PM | #11 |
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Location: Southern New Mexico
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GOOD JOB!!!
Thats why we all hang out here. |
07-12-2002, 09:05 PM | #12 |
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Join Date: Jun 2002
Location: North Idaho
Posts: 43
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did I say the forecast was for 110???
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