The Stovebolt Site Forums The Shop Area The Electrical Bay 58 Blower Motor Wiring

I've been going through the wiring on the truck and replacing most of it. Between a basic wiring schematic that I believe I got from somone on this board a year or two ago and the microscopic one in the shop manual, I believe I have most of the wiring sorted out and correct (we'll see after I hook everything up, put the gauge cluster back in, and try starting it I guess ). However, neither diagram shows how the blower motor on the heater should be wired in. Right now, it is supplied through what appears to be 14 gauge wire from the battery terminal on the starter motor to the heater switch and from there to the blower motor with a second wire from the blower motor to ground. Is this correct? Can anybody confirm what the correct wiring is for a blower motor on a 58? If it matters, it is the original recirc heater not the deluxe heater.

On my 59 GMC, the wiring is like this:
1. Big red battery wire to starter lug
2. 14g wire from starter lug to key switch
3. 14g pink wire from ACC on key switch to fuse block
4. Glass fuse for heater
5. 14g wire over to heater switch
...

That's where my wiring "harness" stops. The previous owner dismantled the heater stuff for some reason. <shrug>

But, there should also be a NiChrome wire on ceramic system close to or on the fan speed selection switch. It acts like two or three resistors so you can alter the fan speed.

I know I had one on my 58 'cause I burned my hand on it at least once.

Otherwise, you're on track.

I have a recirc type, but I think it too is just as Ezekiel said, only there is also a brown wire that goes from my switch to the blower. That NiChrome ceramic thingamabob/resistor is between the red wire and the brown wire.

From memory. No warranty expressed or implied!

Bill

My 57 is just as Ezekiel says, but I have no ceramics or resistors. My heater switch is just a three-position (three fan speeds) switch.