I’m a sucker for adding options that didn’t originally come with our cars while still using GM sourced parts. Here’s a quick write up on how I upgraded to power mirrors on my Monte Carlo SS. This is specific to Monte Carlos for the most part because of the mirror housing.
Edit: Corvette, Camaro, Firebird mirrors are unconfirmed to be the exact same housing. Monte Carlo and Fiero are confirmed via part number.
80s Corvettes, Camaros, Firebirds, and Fieros MAY have all used the same “sport” mirror housing across the board. I pulled the mirrors used from a Fiero and confirmed part numbers stamped in the housing are the same as originally on my Monte. If the mirror wasn’t power or adjustable, there is a small piece of tape covering the hole the wiring came through. The difference being the gasket that went between the mirror housing and the door panel. This is what gave the curve needed to match the different body lines of the doors.
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Once I realized they were the same, I opted to just use the Fiero mirrors and swap the Monte Carlo gasket over. I used the control switch from a 90s
Caprice which fit perfect in the stock mirror adjuster bezel. I didn’t take a photo of that but the one below is one I found that shows the exact same thing.
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I then pulled the pig tails needed from the car and tied it all together. I used the following diagram that I found on another forum to help get a simple idea on how it should look. I do not take credit for this diagram and give credit to whoever made it.
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I tied in the pig tails and cleaned them up with some heat shrink. Made sure there was enough wiring to make it to the opening in the door panel while still clearing the window glass. I tucked the harness into the same “holder” as the original adjustment cable went through.
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I ran the wiring under the dash and to the passenger door, did the same wiring tucking so it would clear the glass on that side too. I left a pig tail on that side too so the mirror can be removed if needed. I ran a ground to the spot used for the other power options in the drivers door. Ran the power line to the fuse box and spliced in a stock end so it’ll click right into one of the accessory spots.
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All in all it can be done easily in one afternoon if you have all the parts already. I suggest greasing the motors, they’re old and dusty. Otherwise very straightforward. I’ll be happy to answer and questions and help anyone who’s doing this upgrade too.