Heater control wiring

[blown motor]

74 Challenger, there's a blue and a green wire that goes on the back of the heater control, near as I can figure. Not sure why mine is off. Probably one of those Murray things.    I think they both attach to spades in the middle of the control, horizontally speaking. Which is top and which is bottom? Sorry, the picture is actually upside down.

[anlauto]

 

[blown motor]

Thanks @anlauto  Do those wires run the fan? Mine hasn't been working. Also, are the three spades on the left for A/C?

[anlauto]

I think the three spade plug is what controls the blower motor.

[blown motor]

Now that I think about it that would make sense because the three terminals is likely what gives different speeds, not?

[shawge]

Looks similar to a 72 unit, maybe this will help?

https://forum.e-bodies.org/dlattach/topic=1349.0;attach=15462;image

[blown motor]

I got back at this today. There is keyed power on the green wire. I'm assuming this is correct. With the controls in A/C, MAX A/C or the OFF setting I have power on the blue terminal. At no time do I have any power on any terminal of the three pronged plug. What's up?

[screamindriver]

I figured I'd pop in over here on your other thread to see how you are making out..Your two wires in question are simply the A/C clutch feed wire circuit...Green would be the accessory feed hot, blue is the switched hot for the clutch itself activated by the control unit..Look around under there you need your 3 prong connector to plug in to the control unit.EDIT:.Look at the link Shawge posted it pretty much has all the info..

[blown motor]

It seems my control is pouched.    I put a jumper wire in the three prong plug and the fan runs on one speed. That's better than no speed for now.

[screamindriver]

Maybe not...It appears one speed is run through the control{defrost?} and the rest are routed through the blower switch.. Plug it all in and try it..

[blown motor]

I did plug it in. In the three prong plug the centre one is black which is power. With it plugged in I have no power on either side terminal at any speed setting.