88 k1500 5.7 misc Q's

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bman

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Help identifying wire/connector under dash,driver side (black, brown, white wires) No apparent connection point for this connector. Unused accessories for different model using same harness maybe?
Also have only high speed on wipers, which wire colors on wiper motor connection energize low speed and mist circuits?
Additionally, have very sloppy trans shift linkage, looks like something is askew with the linkage connector bolt for the column to lower linkage connection (pic) what say you?
Also, brake switch only has one 4 wire connector though there is additional terminals for second connector point, is that correct for 88 chev k1500?
Also have what appears to be coolant sensor on right side of block above start with single wire connector in addition to sensors on left head (gauge) and intake (tbi inj) so what's the third sensor for? (no elec fan on this truck)
 

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Erik the Awful

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EDIT I typed up an answer, but I didn't like it. I'm pretty sure it's wrong.
 

bman

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Sensor on right side of block above starter is a knock sensor. Up
 
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