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Looking for a suitable 12 VDC for automotive uses came across something that might be interesting to other DIY's: Automotive Time-Delay Relay
Since a heated mirror option wasn't available for my '03 E250 I'll be designing and installing a system of my own. Being in the glass biz I have access to replaement mirrors and suitable heating grids so that's the easy part I ordered one of the Wolsten units, its a nicely made small piece, easy to tuck away in an already tight dash area.
I'll write more on this mod later but thought I'd make these known here. I'm NOT affiliated with this company at all, just wanting others to be aware they're out there!