KJoeZ61
Well-Known Member
Does anyone know what the proper ohm reading would be on a 71 Scamp blower resistor? It has three resistor wires and all three barley show any resistance.
Joe
Joe
testing heater A/C blower resistor
- Thread starter KJoeZ61
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TrailBeast
AKA Mopars4us on Youtube
Pretty sure it has to have a load on it to really tell, because they work by reducing (using up some of it) amps instead of resistance.
The little springs cause an amp draw when power is run through them with a load on it.
If you have continuity through them, they are probably ok.
KJoeZ61
Well-Known Member
Yes it has continuity through it each way.
TrailBeast
AKA Mopars4us on Youtube
That's one thing I don't have is an amps draw tester, but I do want to get one.
Actually I was planning on asking Del @67Dart273 how I could build one or where to get one.
Your heater resistors are probably fine.
67Dart273
Well-Known Member
You have it out? You can pretty much tell by looking at it. The problem with measuring resistance of ANYTHING that sees a lot of load, is that some loose / poor connection can "make" enough to satisfy the ohmeter and lead you down that lower road......the wrong one that is
Another example is high current diodes such as used in welders and alternators. You can NOT measure them with a meter, you MUST put them under substantial load
One way to do this is to get the connector/ wiriing down where you can access it, then "clip lead" the motor to one terminal, and "clip lead" power in from say,...........the fuse panel
Another example is high current diodes such as used in welders and alternators. You can NOT measure them with a meter, you MUST put them under substantial load
One way to do this is to get the connector/ wiriing down where you can access it, then "clip lead" the motor to one terminal, and "clip lead" power in from say,...........the fuse panel
So much brand variety in my history that I cant say definitely but... I'm pretty sure these resistors accumulate. Each switch positon, wire, fan speed change, routes current through just 1, or 2, or all 3 resistors, except HI which is direct battery voltage, no resistor.
The most typical fault condition I've seen is only HI fan speed works. The one resistor that broke interrupted all 3 paths. I can't say why they fail in that manner.
The most typical fault condition I've seen is only HI fan speed works. The one resistor that broke interrupted all 3 paths. I can't say why they fail in that manner.
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