Heater switches

[Tomahawk715]

Whats everyone running for heater switches? I know I could run a straight on/off-My DD has that setup right now as I've not been able to track why the switch isnt working. I've converted to 12volt--I've got a switch I took out of a J truck-4 position-dont know if I can reuse that or not. I'd like to have the option of not having it screaming all the time at high speed.

[amphi]

In order to get three speeds from a four-position switch from the J truck you need the resistor pictured below on the side of your heater box.

These are pictures from my 1976 J10 with a four-position switch on the dash (Off, Low, Med, High)

Heater Switch


Three terminal resistor –outside view.


Three terminal resistor – inside view.


This is the sketch I made for Todd's (fisherman) truck. He has a three-position switch.


If you need a diagram for three speeds – just let know I'll draw one for ya'

[Tomahawk715]

Three speed diagram would rock--The switch you have pictured is the one I have-4 position out of 73 J truck.

[fisherman]

I used a toggle switch my dash. I have High/low and off position. Again thanks to Amphi for the wiring diagram.

[Tomahawk715]

So basically you used a two position "on" switch and ran it thru the resistor?
I'm probably going to use the Jtruck one just to be thrifty since I already have it but just wondering. Trying to do the same with the light switch as well--looks like a GM pull switch to me.

[amphi]

Tomahawk715

Did you save the connecter on the back of the four position heater switch with wires colored Red, brown, light brown, and brown with white stripe?

I'll get a drawing for you so you can use the four-position switch. It will be easier for me if you have this connecter.

Do you have the resistor in the heater box with its connector?

I posted a picture of what I think might be your light switch in this thread
J truck switches

[Tomahawk715]

Now why would I do something intelligent like that? I've got the one for the headlight switch but not this one. The resistor I believe came with my wiring harness-painless one. Wish I could have kept the truck around but it was in my cousins yard and his wife isnt real fond of such things-stripped it as fast as i could so as not to er off eh.

[amphi]

Is the heater core and box from the J truck, if not what kind do you have?

Can you post a picture of the fan switch -- back terminal side?

[Tomahawk715]

Yes it is from a J truck-I'll try and post up some pics tonight-got it at home.

[amphi]

Yes it is from a J truck-I'll try and post up some pics tonight-got it at home.

Great!

It should have the same resistor as mine pictured above. Post a picture of yours if you can -- just the outside terminals, you don't have to remove it.

I canl make a drawing after I see the pictures of the switch-back and resistor.