Good day. I have installed a cheapie door lock/unlock system in my 760. I used the motor and linkage from a 1986 740.

To determine how the wires are connected, you'll need to figure out what kind of outputs they are. There are "negative outputs" and "positive outputs". If the manual doesn't say anything about this, you'll need a multimeter and a 12v power supply.

If you are familliar with electronics or computers, negative output is synonomous with "open collector". This means that the wire is usually open, not connected. When the wire fires, it becomes a ground or chassis connection, draining a 12v source. The problem with these is that they usually won't take much current, and are nevertheless worthless for direct connection to the motor.

If the outputs are positive, see if the outputs ground when they arn't on. If they do, you can connect the lock and unlock streight to the motor.

My installation used negative outputs. I constructed a circuit board with relays that connected it to the motor. Mine also has a relay in the door so I didn't have to run a relay across the hinge.

If you're near the Northwest Arkansas reigon, I'd be more than glad to demonstrate and/or assist. If not, I can draw you schematics of what you'll need to get the desired effect.

Good luck!
--
89 764 GLE 150k/ 86 745 GLE 240k