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Frank, I'm cycling the OD OFF light in the instrument cluster by hitting the button on the shifter. Am I wrong in assuming that means the OD switch is working?


That should mean the switch is good.

The relay has 5 wires connected to it:

Black is full-time ground.

Blue/White is temperature switched ground and should show continuity to ground when the temperature switch closes (test wiring in between temp switch and relay by shunting the switch to ground at the thermostat housing).

Black/White is power to the OD/OFF solenoid valve on the transmission (check wiring by shunting temperature switch, IGN in RUN, transmission in D, OD switch ON.... should be power to solenoid valve).

Those 3 are the main OD control connections. There's also a Red and a Blue/red wire that go to the flasher and A/T temp circuits.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum