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  #21  
Old October 15th, 2016, 12:03 PM
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You can just pull out the fuse and see if the wire inside is broken. Buy one of these and keep it in the truck. https://www.amazon.com/gp/aw/d/B000B...wwL&ref=plSrch The yellow thing both allows you to test the fuses in place and the other end is a puller making it easier to get out.

This one has 7.5 amp fuses which the other one does not. Not sure of the brand though.

https://www.amazon.com/gp/aw/d/B000B...kWL&ref=plSrch
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  #22  
Old October 15th, 2016, 12:05 PM
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Yes, that is the plug to the motor. Put power across it and see if it spins. Best to look at a wiring diagram to know what wire is what. Looking that other side of the plug, the purple wire is +12V with ignition on and the green wire is grounded when the heater switch is on.
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  #23  
Old October 15th, 2016, 12:11 PM
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Quote:
Originally Posted by evilfij View Post
You can just pull out the fuse and see if the wire inside is broken. Buy one of these and keep it in the truck. https://www.amazon.com/gp/aw/d/B000B...wwL&ref=plSrch The yellow thing both allows you to test the fuses in place and the other end is a puller making it easier to get out.

This one has 7.5 amp fuses which the other one does not. Not sure of the brand though.

https://www.amazon.com/gp/aw/d/B000B...kWL&ref=plSrch
Thank you. Purchased. I noticed that numbers on the fuses don't match the numbers on the cover in quite a few cases. For example, the cover might show that it should have a 15 but the fuse that is installed is a 7.5 or a 20. That can't be good, right?

------ Follow up post added October 15th, 2016 10:13 AM ------

Quote:
Originally Posted by Red90 View Post
Yes, that is the plug to the motor. Put power across it and see if it spins. Best to look at a wiring diagram to know what wire is what. Looking that other side of the plug, the purple wire is +12V with ignition on and the green wire is grounded when the heater switch is on.
Ok, good to know. I will stick the new volt meter in there later today.

What do you mean by "Put power across it"? How do i do that?
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  #24  
Old October 15th, 2016, 12:55 PM
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Not sure about the mismatched fuses. There is one that was supposed to be updated from a 7.5 to a 10 but I forget what it was. A 10 in a 7.5 is probably ok. A 20 is not. A smaller amp fuse may blow, a higher amp one can cause issues. Are you sure you are reading the panel cover correctly? My guess is someone put in whatever they had when it blew, but you should put in what is on the cover.
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  #25  
Old October 16th, 2016, 12:37 AM
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Ok, I received my volt meter and tried it out. I got a 12v reading from the top left fuse (overhead light) so I know i was doing it correctly. I did not get any reading from the top or bottom fuse 4th from the left in the above photo which the diagram is showing as the fan fuse. I also tried the voltmeter at the plug to the motor and did not get any reading
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  #26  
Old January 25th, 2017, 01:41 PM
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Heater riddle for today:

Blower fan is not working.

Fuse is fine. Ground for reversed polarity GM blower fan is correct. Bench tested blower fan (fully installed in heater box) with battery, I also took the leads from the switch (lever) and put a wired between negative and positive with no result. Test light shows no power flowing through fuse (fuse works in other locations).

So what else could be preventing the blower fan from operating? How can i use a multimeter to help diagnose this (like faulty wiring)?
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  #27  
Old January 25th, 2017, 04:55 PM
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Just to confirm.. I should be able to take a wire from the ground to a power on the switch leads and test if it's the switch or the wiring, right?
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  #28  
Old January 25th, 2017, 06:17 PM
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Took out the old MC, it was pretty gross looking after 28 years, also took out the slave cylinder
Sanding and painting the new pedal box, just waiting on new MC.

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Is this new slave cylinder correct?
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Im going with OEM MC because i can rebuild my old one for a few dollars and the slave cylinder AND MC was right under 40 dollars.
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  #29  
Old January 25th, 2017, 09:49 PM
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oops, last post was posted in the wrong thread.


Fix my heater fan. Switch was dirty.
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