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AR15.COM
8/17/2014 4:56:37 PM EDT
WTF is this grey cylinder on the back of my switch?  Looks like it has been coated in something.  Goes to '49 Chevy truck heater.  It had cardboard on it whenmI opened the box, should I keep that on?


8/17/2014 4:58:00 PM EDT
[#1]
fan speed resistor
8/17/2014 4:58:13 PM EDT
[#2]
12V dikfer.
8/17/2014 5:00:33 PM EDT
[#3]
Yep, ballast resistor.  In high speed, resistor is bypassed, in medium speed, only one leg of resistor is used.  In low speed, both legs are used.  It gets hot, the coating keeps it from burning out.
8/17/2014 5:01:00 PM EDT
[#4]
replace the fuse with a 22 shell, what could go wrong?
8/17/2014 5:10:09 PM EDT
[#5]

Quote History
Quoted:


Yep, ballast resistor.  In high speed, resistor is bypassed, in medium speed, only one leg of resistor is used.  In low speed, both legs are used.  It gets hot, the coating keeps it from burning out.
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Perfect description.
 
8/17/2014 5:10:21 PM EDT
[#6]
Looks like a ceramic resistor. It's used to control blower fan speed. The resistor is simply connected in series (through a multi-position selector switch) with the blower fan motor thus creating a voltage drop which in turn reduces motor speed.
8/17/2014 5:19:11 PM EDT
[#7]
Quote History
Quoted:
Yep, ballast resistor.  In high speed, resistor is bypassed, in medium speed, only one leg of resistor is used.  In low speed, both legs are used.  It gets hot, the coating keeps it from burning out.
View Quote


Not quite right. The full resistor coil is used for the slowest speed, the middle speed will use half the resistor coil and the full speed bypasses the resistor coil.
8/17/2014 6:01:39 PM EDT
[#8]
Quote History
Quoted:
12V dikfer.
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What's a dikfer?  Anyway it's 6v dikfer.

So the cardboard comes off right?
8/17/2014 6:04:37 PM EDT
[#9]
Quote History
Quoted:


Not quite right. The full resistor coil is used for the slowest speed, the middle speed will use half the resistor coil and the full speed bypasses the resistor coil.
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Quote History
Quoted:
Quoted:
Yep, ballast resistor.  In high speed, resistor is bypassed, in medium speed, only one leg of resistor is used.  In low speed, both legs are used.  It gets hot, the coating keeps it from burning out.


Not quite right. The full resistor coil is used for the slowest speed, the middle speed will use half the resistor coil and the full speed bypasses the resistor coil.


Yep.  This one is correct.
8/17/2014 6:04:51 PM EDT
[#10]

Quote History
Quoted:
Not quite right. The full resistor coil is used for the slowest speed, the middle speed will use half the resistor coil and the full speed bypasses the resistor coil.
View Quote View All Quotes
View All Quotes
Quote History
Quoted:



Quoted:

Yep, ballast resistor.  In high speed, resistor is bypassed, in medium speed, only one leg of resistor is used.  In low speed, both legs are used.  It gets hot, the coating keeps it from burning out.




Not quite right. The full resistor coil is used for the slowest speed, the middle speed will use half the resistor coil and the full speed bypasses the resistor coil.
Leg of a two leg resistor is still half, it is a center tap.  

 
8/17/2014 6:25:52 PM EDT
[#11]

Quote History
Quoted:


replace the fuse with a 22 shell, what could go wrong?
View Quote


Set screws last longer.



 
8/17/2014 6:39:28 PM EDT
[#12]
Quote History
Quoted:
Yep, ballast resistor.  In high speed, resistor is bypassed, in medium speed, only one leg of resistor is used.  In low speed, both legs are used.  It gets hot, the coating keeps it from burning out.
View Quote
Mostly.
8/25/2014 1:20:13 PM EDT
[#13]
Cool