I will try to answer a couple of the questions I have seen:
1) using the "supplied" harness switch vs. adding a Toyota switch.
There is a built-in timer/circuit board on the Muth Harness. When you turn the mirrors on, the switch "indicator" light comes on also. The mirrors run for 10 minutes and then shut off automatically. When the mirrors go off, the light in the switch goes from solid to blinking. The "blinking" light acts as an indicator to you to either shut off the switch and turn it back on for another 10 minutes or just shut off the switch. I felt that the harness may work better by having a switch designed for the function of the timer and harness and chose not to change it. Now I did order another switch that has the same function, but it has a less noticable indicator light vs. the entire switch being a light. This is not a real high-tech system here. Basically the switch is a 3 wire switch: positive, negative and "blinker" positive.
Probably the best type of a "factory" switch to use would be one that would fully turn itself off when the timer went off so that the switch is not automatically "on" every time you turned the ignition on.
2) wiring the heaters into the rear window defrost - same logic as #1. timers are built into the mirror harness and I felt I would let them function as designed and not have to worry about the rear defrost timer overriding the mirror timer. you might also be able to use the rear defrost timer in place of the mirror timers, I just chose not to go there and keep the mirrors as a seperate entity.
3) The parts are identified in the write up. You need to buy 2 items and that is it.
a) mirror heatings pads: Mine are Burco #3801 Redi Heat
Redi Heat
Note: Casey and I are in the process of coming up with a little larger pad
b) the harness is from Muth Mirrors: #H-MOD
Muth Mirror Systems, LLC - Automotive Signal Mirror® Kits
they are having a 20% off sale thru December with free shipping! had it the next day!
this includes full harness, inline fuse, connectors, timer, switch, etc.
c) the only other items I purchased was a door trim tool from Napa and
some crimp style splice caps
Project is not really all that difficult, just a lot of little steps you need to go through. Let me know if you have more questions.
