I have an early 1970 Series 1 car so I purchased a 1970 service manual. Nice book, original printing from 1969 or 1970. But in the electrical section it does not mention the rear defroster at all. Even the wiring diagram does not show the defroster or switch.

Here is a scan of the service manual the areas circled in red are where the defroster should be, I have a service bulletin from May 1970 that has a wiring diagram in it that shows the defroster but the service manual does not.

Go figure!

The earliest cars had no defroster. If you got a manual printed in 1969 it may be a bit too early for your car.

You'll notice that there's no heater blower on that either. My '71 FSM shows the defroster, but still no heater.

Here is a link to onuthin's galley he posted one that is correct for the early series cars. This one shows the switch and the glass. My FSM does not show it for the 70 either. I know that we have the wiring straight from the switch to the window heat unit.

http://www.classiczcars.com/forums/member.php?u=9811