connections on heater box

[michael bucklew]

what is the purpose of the electrical connections on the heater box

 

[terrywalker]

These might help.
Terry W.

 

[michael bucklew]

These might help.
Terry W.

View attachment 120147

View attachment 120148

this is my heater box and the wire diagram

 

[terrywalker]

The wires through the resistor controls the blower motor speed. The one I show is non A/C and is two speed. Yours is a 3 speed blower motor. Your plug looks like what is in this drawing showing 3 speeds. The resistor and switch determine speed of blower motor.
Terry W.

 

[terrywalker]

BTW. When that resistor opens up on a leg, the blower motor many times only has off and a single speed instead of 3 speeds.
Terry W.

 

[michael bucklew]

BTW. When that resistor opens up on a leg, the blower motor many times only has off and a single speed instead of 3 speeds.
Terry W.

guess I will trace out the wires to see if they are hooked up correctly

 

[Chryco Psycho]

the resister can fail only allowing high speed to work

 

[sixpactogo]

The reason that resistor is mounted in the heater box is when the blower is on, it is moving air past that resistor helping to cool the coils. Not sure if that was your question or not.

 

[michael bucklew]

the resister can fail only allowing high speed to work

the resister can fail only allowing high speed to work

I

The reason that resistor is mounted in the heater box is when the blower is on, it is moving air past that resistor helping to cool the coils. Not sure if that was your question or not.

question answered

 

[michael bucklew]

The wires through the resistor controls the blower motor speed. The one I show is non A/C and is two speed. Yours is a 3 speed blower motor. Your plug looks like what is in this drawing showing 3 speeds. The resistor and switch determine speed of blower motor.
Terry W.

View attachment 120158

where did you get this wiring diagram????

 

[michael bucklew]

The wires through the resistor controls the blower motor speed. The one I show is non A/C and is two speed. Yours is a 3 speed blower motor. Your plug looks like what is in this drawing showing 3 speeds. The resistor and switch determine speed of blower motor.
Terry W.

View attachment 120158

have power to the lite green at the switch, but no where else. no power coming out of wire on fire wall at harness plug. inspected the resistor and it look like new....

 

[terrywalker]

I have factory service manuals for all my old cars.
Terry W.

 

[michael bucklew]

These might help.
Terry W.

View attachment 120147

View attachment 120148

I found it I found it. tan wire from heater box got disconnected. everything now works. also found my 1871 chassis service manuel..betted details on components. thanks

 

[terrywalker]

Great news that all is good.
Terry W.

 

[michael bucklew]

Great news that all is good.
Terry W.

thanks

 

[michael bucklew]

Great news that all is good.
Terry W.

now that I got it running, I never noticed that there is no OFF position on the fan switch..with ignition or accessory on the fan runs.. ????? does it turn off somehow?

 

[Steve340]

The fan switch should be able to start and stop the blower motor.

 

[michael bucklew]

The fan switch should be able to start and stop the blower motor.

just went and checked---Switch says Low /High. jiggled it a bit see if it turns off--no off position---Perplexed

 

[Steve340]

Something not right there the switch definitely switches on and off the motor and adjusts the speeds.

 

[michael bucklew]

Something not right there the switch definitely switches on and off the motor and adjusts the speeds.

here is picture of my panel