$17k is crazy. $5k would be nice. One thing I've learned, don't bet on anything electrical. I've had two power windows crap out due to plastic parts failing. My climate control stopped working. It wasn't a blown fuse. The fuse was so old that the metal had separated near the tip. Not melted, broken. My high beam/low beam switch is a little funky. Mileage doesn't matter for some parts. Age does.
Dave

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1986 300SDL