Mirror wiring--need help reading schematic

[Jameel]

Friend's '81 SC coupe. The GRY/GRN wire pair coming out the back of the defog switch are pretty roasted. Questions:

1. Any idea why this pair is roasted?
2. Does the GRY/GRN pair feed 12v to the mirror's motor?
3. If I want to disconnect the heating element wires, what's the best/safest way to do this? I don't care about the heating feature, but I do need to retain adjustability.

On the schematic I see that the GRY/GRN wire goes from the switch to the mirror, through the heating element to #4 then BRN piggy backs over to #5, to the coil, then via dashed lines (what are dashed lines representing?) to the motor. But then we've got 12v coming from above (outside mirror switch) via WHT, BLU and BLK/YEL.

Thoughts?

[Solamar]

Just going by your schematic, the gry/grn is the + (hot) power for the mirror defrost. The brn is the ground (-) which would complete the circuit, heating up the mirrors. Something shorted the gry/grn to ground and cooked it.

The gry/grn does not provide power to adjust the mirrors so deleting it shouldn't cause problems.

[Dr J]

I wired my mirrors for the aero mirrors that replaced the original flag mirrors so I have a good grasp of the wiring.

1) The Gray/Green comes from the defroster switch to defrost the mirror.

2) The motor is powered by the Blue (1) and Black/Yellow (2). Changing polarities on these two wires moves the mirror one direction or the opposite direction on the selected plane (i.e., horizontal or vertical)

3) The coil connected via the white wire (6) controls whether the mirror operates in the horizontal or vertical direction. It either has 12 v or is grounded (no voltage). The mirror joystick switch provides the voltage (or not) depending on the direction of motion you select. The other side of this coil connects to Brown (5) which is ground.

The dashed lines represents control of the motor movement plane.

For operation, if you apply 12V to #1 and ground to #2 while #6 is grounded, the mirror moves in one direction. Flip the polarity in #1 and #2 and it moves in the opposite direction. When 12V is also applied to #6, the mirror moves in the other plane.

[Jameel]

Originally Posted by Solamar

Just going by your schematic, the gry/grn is the + (hot) power for the mirror defrost. The brn is the ground (-) which would complete the circuit, heating up the mirrors. Something shorted the gry/grn to ground and cooked it.

The gry/grn does not provide power to adjust the mirrors so deleting it shouldn't cause problems.

Thanks for this! I will dive deeper to see where the short is.

Originally Posted by Dr J

I wired my mirrors for the aero mirrors that replaced the original flag mirrors so I have a good grasp of the wiring.

1) The Gray/Green comes from the defroster switch to defrost the mirror.

2) The motor is powered by the Blue (1) and Black/Yellow (2). Changing polarities on these two wires moves the mirror one direction or the opposite direction on the selected plane (i.e., horizontal or vertical)

3) The coil connected via the white wire (6) controls whether the mirror operates in the horizontal or vertical direction. It either has 12 v or is grounded (no voltage). The mirror joystick switch provides the voltage (or not) depending on the direction of motion you select. The other side of this coil connects to Brown (5) which is ground.

The dashed lines represents control of the motor movement plane.

For operation, if you apply 12V to #1 and ground to #2 while #6 is grounded, the mirror moves in one direction. Flip the polarity in #1 and #2 and it moves in the opposite direction. When 12V is also applied to #6, the mirror moves in the other plane.

Great info! Thanks much! I owe you a beer.