Blower resistor

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Aug 1, 2004 | 03:37 PM

77' f-100 ranger xlt

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Blower resistor

I have a 77 f-100 without a\c. It has standard air the resistor itself is mounted in the heating duct and it is a three prong. (for high med and low). I was wondering which was which for the high med and the low. Any help would be great.

Aug 1, 2004 | 03:56 PM

87 XLT

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From: SoCal

Maybe one of the other guys will have a wiring diagram for a 77. The only thing that I can tell you is that the high speed is wired directly to the blower motor, not thru the resistor. Just curious, but why do you want to know this?

Aug 1, 2004 | 05:56 PM

77' f-100 ranger xlt

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the old wiring harness caught fire so I had to install a new one. I have a diagram but it shows it as a bar not a three prong. Yes the high connects to the blower motor but I need to know which one is the high med and the low.

Aug 1, 2004 | 09:02 PM

Gary B

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From: Il.

experment with different connections ,what you have three chances till you hit the right combo.all you will have is the speeds in the wrong place, good luck!!

Aug 1, 2004 | 10:28 PM

87 XLT

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From: SoCal

Now why did'nt I think of that, like Mike sez experimenting wont hurt anything. All the dash switch does is provides a ground to the voltage coming from the resistor.

Aug 2, 2004 | 11:05 PM

mtandorfer

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I have a 75 F-100 Ranger w/ factory a/c and yours should be the same as mine. I have 4 positions for the fan, all the way down is low when the location selector is not in off position, then up 1, up 2, and up3 which is high. You should show 3 resistor coils between prongs and two prongs separated w/o a resistor. That is the high speed, no resistor to slow it down. By now though, Im guessing you've figured it out by trial and error. Let me know if this was right. Good Luck.

Aug 2, 2004 | 11:57 PM

77' f-100 ranger xlt

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Actually I have not been able to do it by trial and error yet. I do not have a battery put in and it will not be in for awhile. So that is why I was wanting to do it right the first time. Now for the resistor as I am looking at it it looks like this l_l. Now the one on the left has a small coil and the one on the right has a large coil and the one in the middle is connected to both coils. So if there is anymore help out there please send it.