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Did the ash tray have a courtesy light with it? If yes, then you have two circuits to consider: The always hot cigar lighter and the switched courtesy light. Are you looking at the wrong plug/socket?

For schematics, check out your local library for remote on-line research services. I purchased several Chilton manuals only to find I already had them available free on-line via my library. A big advantage of the on-line manuals is you can capture, zoom and print those pesky small diagrams in the manual. It makes it MUCH easier when trying to follow a schematic. Also, as we were all raised not to mark in books, you can make all the notes you want on your own home-printed copy.
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