land rover defender - retrofitting heated wing mirror elements

Our customer was fed up with frosted mirrors during the winter months... however, we were more than happy to provide a suitable solution. A few modifications were carried out to the wing mirror mounts to conceal the new wiring, then an extra wiring loom was made and connected through the existing door hinges. This meant no wires were exposed, and you’d hardly even know this modification had been carried out!! 
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Then the mirror glass was removed from its housing and a heating element fixed to the rear of the glass. Once the door wiring had been completed, we then had to supply the wing mirrors with power for the heating element to warm up. Instead of a separate switch being fitted to the dash we wired in a relay circuit from the heated rear windscreen, this meant that when the heated screen was activated, so was the heated wing mirrors. Genius! Problem solved!