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Do you get any de-misting at all?
Sounds like somewhere in the rear window replacement the wiring got crossed up and/or shorted. But not an immediate blows-the-fuse-now short.
Are you in a 242/4 or 245? Wiring for the 245 rear demist gets involved in the cargo door hinges. Not so in the 242/4
From the wiring diagram, looks like the rear demist runs off Fuse #11, along with the overdrive (man and auto). So, if the fuse blew you would know it is (1) no rear demist, or (2) no overdrive - if you were in overdrive at the time.
I would recommend not replacing the switch with the 125vac one, since it seems that the switch failing is a weakest-point failure and moving that point to another part of the circuit may make harder-to-find damage.
In the wiriing diagram, the rear window gronds on the right side. The feed wire is yellow, and runs along under the left side in a large harness you will find under the carpet. It goes to a connector, 3-wire, above the driver's left toe. The wires in that connector are yellow, red, and brown. the other wires feed the rear marker lights.
That yellow wire ought to be getting pretty warm if the problem is in the rear window circuit. It could be elsewhere, I suppose.
Good Luck,
Bob
:>)
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240s: 1986 244GL, 1988 244GL, 5 other240s and one lonely FIAT 850.
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