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Nope. Pink and blue on opposite small terminals = good to go. Top or bottom does not matter.

Not quite sure what you are describing, but note this: With the stock GP resistor in place, you WILL measure 24v at the top of the GP relay when the GPs are not engaged (turned on). This is normal. When the GPs are engaged (turned on), you should see 12v at the top of the GP relay. This has...

Have you discovered the Helpful Threads sticky? (Top of the CUCV forum.) Good stuff there, including a link to a thread about the temp sensor. I haven' had reason to mess with mine, so I have not learned its ins and outs. Maybe that thread will answer your questions.

Well, that depends. If it's connected to the relay (solenoid), it has 4 possible conditions: The ignition key is OFF, and the GP card is NOT providing ground to activate the GPs. The ignition key is OFF, and the GP card IS providing ground to activate the GPs. The ignition key is ON, and the...

Nope. That one ground wire is for everything inside the truck. Not a good design. It's probably okay, but it won't hurt to take it apart and hit it with a wire brush or sandpaper. Make some nice shiny metal, add some dielectric grease to prevent corrosion, and put it back.

Okay, sounds good. Now, are you checking for power when the wires are connected? If so, it makes sense that the blue wire would show 12v. That's because it's connected through the coil to the small red (pink) wire, and when the GPs are not activated, its other end is connected to nothing...

You should NOT have 12v to both the pink and the blue wires. The blue wire provides ground to the relay coil when the GPs are activated. Some ST85s do ground through the case. Disconnect your unit and measure continuity from each of the terminals to the case. NONE of them should have...