Recent content by Glagulator

Looks to be the auxiliary cooling fan temperature switch. https://www.gmt400.com/threads/are-the-coolant-temp-sensors-the-same.67524/

It is the cooling fan temp switch. https://www.rockauto.com/en/catalog/gmc,1994,c3500+pickup,7.4l+v8,1147878,electrical-switch+&+relay,radiator+fan+switch,4312

That sensor is probably a temperature switch for a DB2 injection pump.

Google this "WHICH GM TRUCKS HAVE RVC ALTERNATOR CONTROL"

You can download the 82 service manual & electrical schematics here- http://www.mediafire.com/download/0jpoyh1zecydkn8/1982_GM_CK_LIGHT_TRUCK_Wiring_Manual_1B-1G.pdf

Google dorman 13808 and you will see the diff. types used. If it is the "hat" looking part then get a new one, they usually break when removing.

Transmission problem?

I build the harnesses for these diesels. Did you see my question about existing terms? FYI the FSM's are full of errors.

A2 - AUTO TRANS 12V. IGN - NOT NEEDED B2 & B3 - NOT USED 3500HD C2 - PARK/NEUTRAL SAFETY SWITCH - NOT NEEDED D1 - ABS DIAGS GOES TO DLC - 3500HD ONLY Are there terms on the firewall conn. for any of the above terms?

The GM radio gets a signal from the VSSB and as vehicle speed changes the volume is adjusted.

That metal box is the speaker amp. The receiver is a black plastic box on the other side of the metal bracket that the amp is mounted to. The photo I posted with an arrow is one of your photos. 3rd photo post #4. It's there or your keyless would not work. First of all, if the other door locks...

Not luxury. PITA to get to.

Should be in 1st photo. You may have the "luxury" setup. Do you have a Body Control Module? See pg. 8-589 FSM.

The previous page of your FSM shows where it is. Pg. 8-725

First bracket in diagram. Second bracket is part of the rear heat lines where they get close to the frame behind front tire.