Author Topic: Blower fuse  (Read 835 times)

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Offline dnoonkeste

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Blower fuse
« on: August 17, 2006, 03:19:03 PM »
I have a 1986 Dodge Truck.  The blower motor works if I hook it up directly to the battery, but if I try to turn it on with the switch it will blow a fuse.  I cannot find a broken wire any where.  What could be the problem?
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Offline Chump

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Re: Blower fuse
« Reply #1 on: August 18, 2006, 01:11:35 AM »
Does the blower motor spin real easy by hand? Bearings or motor could still be bad. do you have the correct size fuse installed? 30 amp? You could have a bad switch on the dash or a problem at the resistor block on top the heater box. Also if you have a tilt steering column check the wiring at the ignition switch and see if it's melted.
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Re: Blower fuse
« Reply #2 on: August 18, 2006, 08:03:41 AM »
l,d say switch or resister
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Offline dnoonkeste

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Re: Blower fuse
« Reply #3 on: August 18, 2006, 02:21:45 PM »
Does the resistor block look like a heater coil.  I checked this out and it will heat up?  Where is it in relation to this, if that is not it?

Offline Chump

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Re: Blower fuse
« Reply #4 on: August 18, 2006, 06:11:29 PM »
Does the resistor block look like a heater coil.  I checked this out and it will heat up?  Where is it in relation to this, if that is not it?


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Offline dnoonkeste

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Re: Blower fuse
« Reply #5 on: August 18, 2006, 09:50:54 PM »
I found the resistor block.  I hooked up the wires to it and it gets hot. Is it good or bad?

Offline Chump

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Re: Blower fuse
« Reply #6 on: August 18, 2006, 11:18:40 PM »
Good, as long as all your blower speeds work correctly and they get very HOT...don't burn yourself! That needs to be cooled by the blower motor so reinstall it.
If you have no time to answer the questions or try the advice then don't expect to fix it anytime soon!


Offline dnoonkeste

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Re: Blower fuse
« Reply #7 on: August 19, 2006, 10:08:00 PM »
The switch seems to only work on high speed.  What could be wrong now?

Offline ToxicDoc

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Re: Blower fuse
« Reply #8 on: August 19, 2006, 10:24:40 PM »
The switch seems to only work on high speed.  What could be wrong now?

That's a bad resistor.  At high speed it bypasses the resistor.  So for low speed failure you have either a bad switch or a bad resistor.
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Offline Chump

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Re: Blower fuse
« Reply #9 on: August 19, 2006, 11:05:21 PM »
The switch seems to only work on high speed. What could be wrong now?

You may have blown the thermal fuse on the resistor by heating it up. Time for a new resistor.
If you have no time to answer the questions or try the advice then don't expect to fix it anytime soon!


Offline skajm

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Re: Blower fuse
« Reply #10 on: August 20, 2006, 02:46:38 PM »
It also could be the switch. My superbee only had high, took the switch apart and the contacts where carboned up. Clean with sandpaper and life was good again. Just my two cents.
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Offline dnoonkeste

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Re: Blower fuse
« Reply #11 on: August 25, 2006, 05:13:21 PM »
I have changed the blower motor, switch and blower resistor and it still blows a fuse.  What can I try now?

Offline JackedRamcharger

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Re: Blower fuse
« Reply #12 on: August 25, 2006, 05:30:45 PM »
how does all the wiring look?
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Offline ToxicDoc

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Re: Blower fuse
« Reply #13 on: August 25, 2006, 07:38:06 PM »
I have changed the blower motor, switch and blower resistor and it still blows a fuse.  What can I try now?

 Chump asked but I didn't see an answer from you.  Are you using a 30 amp fuse?  That's what it calls for.  If you're still blowing the fuse, you must have a short/ground somewhere that's causing you to draw too much current.  I can't envision any other scenario if the blower is new and the switch and resistor are normal.   Just make sure something isn't crossed wired, etc.
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Offline dodgeram440

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Re: Blower fuse
« Reply #14 on: August 25, 2006, 08:07:36 PM »
You might check out the control panel also. I know on my 86, the control panel is bad and I have to jump the connector to get the blower to come on. It doesn't blow a fuse, but that is another posibility to check out. On the back side of the panel, there are 3 connectors. A large connector with vacuum lines, a small 2 wire connector that runs the ac compressor (if your truck has ac) and a 3 wire connector that powers the blower motor. Just a suggestion.
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Offline dnoonkeste

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Re: Blower fuse
« Reply #15 on: August 25, 2006, 09:44:40 PM »
The wiring looks alright.  I am using a 30 amp fuse.How can I test the push button switch to see if it is bad?

Offline dodgeram440

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Re: Blower fuse
« Reply #16 on: August 26, 2006, 05:53:42 PM »
If you are referring to the buttons on the control panel, I would pull the 3 wire plug off the back of the panel, use a jumper wire and jump the connector from the center wire to either of the side wires and see if you still blow a fuse.
86 D100 shortbed soon to have a 440
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Offline dnoonkeste

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Re: Blower fuse
« Reply #17 on: August 28, 2006, 01:02:23 PM »
It still blows a fuse.  So, what does that mean?  Is the switch still good?

 

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