69 Charger A/C wiring confusion

Working on daughters 69RT with factory air, getting it ready to be charged/serviced. Started wiring up the A/C controls and noticed there were 2 fan switches in the parts box, one with 3 wire harness and one with 4 incl a separate connector. OK, so check out the FSM schematics and the instrument panel schematic shows 4 wires going to fan switch, however, the A/C schematic shows 3 wire harness. Can anyone help me out?

70runner said:

Working on daughters 69RT with factory air, getting it ready to be charged/serviced. Started wiring up the A/C controls and noticed there were 2 fan switches in the parts box, one with 3 wire harness and one with 4 incl a separate connector. OK, so check out the FSM schematics and the instrument panel schematic shows 4 wires going to fan switch, however, the A/C schematic shows 3 wire harness. Can anyone help me out?

View attachment 1845274 View attachment 1845276 View attachment 1845279 View attachment 1845281

Click to expand...

My '70 charger has the same confusing info. I have spent a long time trying to figure out what they've done here. if you look at the 4 wire connector on the schematic page and follow the black wire down the page, you'll see it goes to a connector and that brings you to fuse box. That wire does exist, and I found it in the dashboard. Now look at the a/c page on the left side, about 1/2 way up from the bottom and you'll see the connector with that black wire coming from the fuse box actually going to the 6 pin connector into one of the top slots. At the same time there is also a light green wire coming directly from the fuse box, same fuse, to the 6 pin connector to one of the bottom slots.
The 4 pin connector on the schematic page doesn't exist on my system. I believe that I have a 3 wire connector for the fan connector. There is also confusion when you mentally overlay the 6 pin connector on to itself, observing the side markers, they incorrectly criss cross the Lt green and dk green wires. My system was rewired by one of the previous owners so the color coding didn't match any longer.

I hope this helps you and maybe someone else will chime in on your 4 wire harness. Good luck. Ray

On non a/c cars the blower switch has an off position. On a/c cars there is no off position on the blower switch. I believe the 4 wire is non a/c and the 3 wire is a/c.

Appreciate the replies. Ray, I had the exact same confusion as you looking at the schematics. In my daughter's RT there is the black/white tracer wire running from the fuse box to a female connector on the A/C harness. There is also a black/white tracer wire with a male connector farther down the SAME harness that leads to the large A/C connector. Also have the light green wire off the fuze box. This is all OE as no one has been in there before me.

The fan switch harness that branches off the main harness has 4 wires, one leading to yet another black wire connector. I'm assuming that is to cover both switch configs, 3 wire for A/C and 4 wire for non A/C. Given all that, how does the A/C fan switch gets its power? Apparently from the tan 14T wire from the main A/C switch to the tan C7A-14T wire leading to the "BATT" connector. Starting to make sense as the fan switch will only operate with the A/C switch in other positions besides OFF. It follows that the 4 wire (non A/C) would need a direct power source, hence the 4 wire connector shown on the instrument panel schematic. Lights are starting to come on, no pun intended.

70runner said:

Appreciate the replies. Ray, I had the exact same confusion as you looking at the schematics. In my daughter's RT there is the black/white tracer wire running from the fuse box to a female connector on the A/C harness. There is also a black/white tracer wire with a male connector farther down the SAME harness that leads to the large A/C connector. Also have the light green wire off the fuze box. This is all OE as no one has been in there before me.

The fan switch harness that branches off the main harness has 4 wires, one leading to yet another black wire connector. I'm assuming that is to cover both switch configs, 3 wire for A/C and 4 wire for non A/C. Given all that, how does the A/C fan switch gets its power? Apparently from the tan 14T wire from the main A/C switch to the tan C7A-14T wire leading to the "BATT" connector. Starting to make sense as the fan switch will only operate with the A/C switch in other positions besides OFF. It follows that the 4 wire (non A/C) would need a direct power source, hence the 4 wire connector shown on the instrument panel schematic. Lights are starting to come on, no pun intended.

Click to expand...

The 4 wire is non a/c, the single black is the power feed. The 3 wire is a/c, a/c cars the blower switch is fed off the push button switch. The diagram is pretty much self explanatory. The 4 wire is for a non a/c car. Toss it out of the way.

Don't toss the 4-wire! PM me if you think that it's a good one and works in all positions.