Tailgate Safety Switch
Y/R is NC to Pu/LG
Br/Bk (Tn/Bk) is NC to Pu/LB
When a switch is depressed by the key lever, the it opens from the Purple wire & closes to Bk/Wh.
The safety switch breaks the circuit (open) between the DOWN switch (right side) and the motor so the glass can't be moved when the latches are open. Since the latches can only be opened when the glass is fully down, this keeps the glass from being raised while the tailgate is open. If the tailgate was closed with the glass up, the glass would shatter against the camper shell lip.
Instead of defeating the safety switch, the tailgate should be aligned so the latches are fully closed. For a writeup on installation & alignment, read
this thread.
To add a simple self-diagnostic capability, wire a 12V lamp across the latch safety switch terminals, and mount it in the tailgate shell above the lock cylinder in the inside sill (through a carpet retainer hole if present). If either control switch is activated, and the only thing preventing the glass from moving is the safety switch, the lamp will light and be visible to a person using either switch.
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To replace one switch or both, drill out the rivets and either cut the wires or break open the damaged switch to unhook them from it. Then mount the replacement switch & connect the wires. Bk/Wh goes to the COMmon terminal; the Pu/? wire goes to the NC terminal; the other to the NO terminal.
