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Correct. Looks like if you connect them it will illuminate the stop lights as if you were activating the Johnny brake for the M1088 trailer. If you ground them you will blow the circuit breaker. So yes heat shrink them individually and label them appropriately. Or follow them back into the...

Correct

Need the numbers printed on the wires to make a determination.

Need the wire numbers to trace them on the schematic. I haven't seen the TL numbers on there. Do you have the CTIS off switch that's part of the arctic kit? The tag seems to suggest it's related. Don't believe I have a switch in that location on my 1079.

Terminal Lugs 501 and 502 (if equipped) are connected to a pressure switch that's directly below the PCU on the passenger side:

Hope it was printed with something like ABS - the heater box gets plenty hot enough to melt many print filaments on it's own. Even at that - ABS starts to get soft around 210 F. A dark colored dash component in direct sunlight can easily approach that. I've had PLA+ printed parts get warped just...