Heater switch wiring

I'm rewiring the jeep as the previous owner left a tangle of spaghetti for me. I am currently wiring the heater which looks like a fairly recent addition. It has a 3 position switch with 4 blue wires coming from the back of it. These 4 wires go in to a 3 wire connector. The wires are blue and one has a red stripe, one a black stripe, one a white stripe, one a yellow stripe. The wire with the red stripe comes out of the wire bundle to a fork type connector which is just dangling. There is also a black wire coming from the bundle above the 3 wire connector which the P.O. labelled power. If I hook that black wire to the heater power wire from my fuse box, where does that 4th wire, (red stripe) go? I would have assumed the red striped wire is power and the black is ground and that the P.O. labelled them backwards. Any thoughts? Attached is a picture of the switch.

 

Really nice picture! Is there a resistor pack stuck somewhere on the heater? If so, so you have a ohm meter? Measure it, and determine the "low" position, "MID", etc. Next, and you can do all of this with a trouble light if necessary, is to determine which wire is the common on the switch, next is the first wire that comes on, followed by number two, and so forth. If all else fails....
just wire up a simple toggle switch for full power....
-Hill

 

After sleeping on the wiring problem I have a question. Does it make sense for the hot wire to go directly to the switch? I am wondering if it's like the headlight dimmer foot switch where the hot wire goes in to the switch and the other wires are for the different speeds like the high/low beam switch. As for a resistor, I'll look but I didn't find anything on my first quick peek.

 

That's how they usually work. 12V to the switch, then the switch feeds the 12V out to the different terminals for the different speeds. Newer stuff will use resistors to achieve the various speeds. Older stuff can have actual 2-speed motors in them. You probably have a resistor pack located in the heater duct somewhere. They cool the resistors by mounting them in the heater's airflow.

Stan

 

Thanks! I did some digging and shot some new pictures. The second picture is the 3 bundle set of wires coming from the switch and the black wire that was hanging free. The 3 wires go from the switch in to a terminal in the heater and one blue with black striped wire and one solid black wire come out. Those two wires go to the plug which is the first picture. The plug is labelled with two positive + signs, both with arrows pointing away from each other. My question is with regards to the single black wire. When I did some continuity testing I put one terminal on the red striped power wire at the switch and the other in that hanging black wire (which leads in to the terminal in the heater then back out to the plug) and when I turned the switch to either of the three positions the circuit was completed. I am kind of baffled as it seems there are two power wires. Any ideas or should I just start plugging and see what makes it work?