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THERE COULD BE ERRORS IN THIS DIAGRAM - I'M RESEARCHING IT...

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NSS / PNP / MLPS / DTR / TR pinouts
WPT-___ | WPT- 389
WPT-289 | WPT- 389

Logic Table:
Start Power (Wh/Pk) should be open to all other pins except closed (under 5 Ohms) to Starter Relay (R/LB) in Park & Neutral
4Low (R/W) should be open to all other pins except closed (under Ohms) to Ground (Bk or switch case) in Neutral
RUN Power (Pu/Or) should be open to all other pins except closed (under 5 Ohms) to Backup Lamps (Bk/Pk) in Reverse
TR Signal (LB/Y) should be open to all other pins except closed (resistance varies by position) to SigRet (Gy/R) at all times

TR Signal (LB/Y) to Signal Return (Gy/R) resistance values:
P = 3770-4607 Ohms
R = 1304-1593 Ohms
N = 660-807 Ohms
(D) = 361-442 Ohms
2 = 190-232 Ohms
1 = 78-95 Ohms

See also:
. . . . . .