I was tackling the fender well rust in my "new" 85 300D. Got a little sloppy with the wire wheel on my grinder and snagged one of the wiring harnesses and yanked out two blue wires. Here's the pic.
081411174720.jpg

I know that one connects to the pressure switch on the a/c receiver drier but can't seem to find where the other goes.

Any help would be appreciated.

Oh...here's a couple of pics of the rust hole. It started out as just removing the crappy seam sealer and undercoating since a little rust was showing. Turned into this:
rust in fender well.jpg

The rust spread out from the seam. I stripped all the undercoating from below and seam sealer above to clean metal about 2" all around. I then treated with some rustoleum rust converter and will let it dry for a few days.

Luckily, the rust didn't spread to the strut support (much thicker steel there) and only ate away at the very thin inner fender well.

I'll probably go back and rough up the converter coating with 300 grit sandpaper and then lay some fiberglass matting/fabric to completely seal off the hole.

Here's another shot:
rust top shot.jpg

Thanks
Storch
Bahama, NC

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Second blue wire maybe to the compressor. Sort of a needle in a haystack guess though. It is supposed to be blue, and does run to the relay with the pressure sensor wire.

I checked (with my fingers crossed) but the wire from the compressor runs up the drivers side firewall.

This wire harness has only two wires, one blue, one darker blue. One definitely connected to the receiver drier switch, the other has to be nearby but for the life of me, I can't find it.

Here are some pics.

The harness that got ripped out.

two blue wire harness.jpg

The large harness end (the tear out is easy to match up)
larger harness end.jpg

The problem end. One wire, with the connector goes to the receiver drier switch. The other is the mystery.

reciever drier end.jpg

It's hard to tell from the pics and the grease/dirt on the wires but the one with the connector is the lighter blue, it's the darker blue that is the mystery.

Storch

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R/D temp switch? Also blue and also in the vicinity.

There are two switches on the R/D. The pressure switch has the prongs on the switch. The temp switch has a pigtail/dongle. Per the wiring diagram both wires from the relays (comp relay and ran relay) are both blue. The pressure switch is a 1 mm^2 blue wire, the temp switch is a 0.75 mm^2 wire.

But...if that wire isn't really blue, but is blue with a stripe, (maybe green?) then it's the other end of the wire to the pressure switch that goes relay-blue wire-switch-return via blue/green wire - compressor.