BearKiller

Under the hood of the son's truck, #3 in the sig., located just behind the washer-fluid reservoir, in the factory harness, is a three-pin connector.

This connector has three wires; two skinny wires on the outer-sides -- a blue w/white stripe and a brown, and a fatter center wire -- blue.

What is this connector and three wires??

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At the fire-wall, where the heater-hoses connect to the core, in the factory harness, is a flat connector, with a hollow round end, with two female spade terminals molded into it.

The two wires are Blue w/pink stripe and Blue w/two white stripes.

What is this connector and it's purpose??

Both of the connectors in question are not plugged to anything.

Thanks.

searcher

That connecter should go to the electronic clutch cycling switch (if you had factory air). That's a guess but the colors match to my wiring diagram.

Micaiahfied

searcher is correct

BearKiller

How about this one??

Thanks.

searcher

Again just a guess, but since we are dealing with ac wiring, the wiring for your low pressure cutout would be dark blue with orange and dark blue with white. An easy way to check would be to check continuity from the blue and white electronic clutch cycling connector to the blue and white of this connector (make sure you check for voltage first in case I am wrong). The blue and pink (blue and orange if I am right) would be a power wire that draws power from the connector at the heater motor. I know that faded wiring is sometimes hard to see the colors. I have had to strip back tape to find out what I am looking at. I hope I am helping and good luck.

BearKiller

It is a BIG help and I appreciate it.

Thanks.