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Gunslinger
Joined: Sat Nov 4th, 2017
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I also *finally* have the the heated mirror circuit put together. Just need to extend it out to the doors.
The Ford schematic shows it's usually controlled by the GEM; where the momentary action of the heat switch pulls the 'heat sense' pin to ground, which trips a relay and starts the timer.
I could have swapped the GEM, but that's a ton of added complexity, when all you need is a timer circuit. That's the board I bought earlier.
Now unfortunately, I can't hook the switch directly to the board and call it a day. The board stays on, and is watching/waiting for two other wires to be connected to each other; not pulled hi or lo. Our switch can't do this without some extra hardware.
Now if we weren't set on using the OEM setup, this would be a non issue. A momentary switch mounted somewhere would do the job just fine, but I'm complicated that way.
So I dug around in my parts bin and got a mini ford relay. I've wired it so that the momentary switch energizes the relay momentarily, which opens and closes the board's trigger contacts. This way, the heater switch operates exactly the same way as OEM.
Now it's just a matter of bringing all the connections I need into the doors, finishing the mirrors up, and assembly.
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1999 Ford Ranger XLT - 3.0 V6 4x4 - Loaded (Totaled) 143k. Rest in Peace, Gold Dust.