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Reply to "Heated rear window - not shown on wiring diagram?"

@nate posted:

...didn't see a comment about the light blue wire so thought I'd offer an opinion at least.  With the red wire removed at the switch end, all the large blue wires in the first photo look 100% 'stock'  - - the image highlights the 'doubled' AC power block, and the 'single' connector normally used to power a dealer-installed radio, when fitted.  At least on earlier cars the OTHER end of that light blue wire went directly to fuse 9.  So if that fuse 9 connection was cut and a load was added between it and the fuse supply, 12V would go to the load whenever the orange switch was closed (i.e., grounded).

If somebody was adding rear window resistance heat to a Mangusta, that would be one EASY way to do it.   Unfortunately I have no idea if that was the factory's approach - - need input from the owner of another car with similar origins/manufacture to confirm whether or not the light blue lead is cut & re-connectorized near fuse 9.   But it's definitely a possibility!

Nate, I'd say the blue wire is original -it's integral to the loom, including running through the PVC sleeving. Having just resleeved the entire loom, there' no way you'd add wires afterwards!

The wire must be a feed for the heated rear window, especially after seeing Denis' photos.

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