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Wiring Instructions for Electronic Brake Controls – Ford Trucks and Vans 1989 – 1991
The brake control must be installed with a 12 volt negative ground system. (To install with a positive ground system use Tekonsha® P/N 3191). WARNING Reversing BLACK and WHITE wires or improper wiring will damage or destroy brake control. Be sure [...]

Rear Differential Lock for 2WD Toyota Tacoma
If the limit SW on the lock side inside the diff. lock shift actuator assembly is on at this time, until the limit SW is turned off, current flows from the 4WD fuse to TERMINAL 5 of the 4WD control ECU to TERMINAL 3 to TERMINAL 3 of the [...]