I believe that relay was originally located under the rear seat.
----- Original Message -----
From: Bert Knupp
To: 'Air-Cooled Volkswagen Discussion List'
Sent: Saturday, October 17, 2009 6:00 PM
Subject: [vintagvw] Rear window defroster wiring
Volks,
The previous owner of my '70- beetle disconnected the rear defroster,
leaving a black wire in black spaghetti tubing dangling under the car, and
no visible connection up front at the fuse box. The little toggle switch is
under the dash, and it seems to be okay, though not connected to anything.
I'm guessing it's a grounding switch for a relay.
Who knows the correct factory routing for this wiring circuit? My schematic
shows a relay, though none is present up front in my car. I'll assume it
draws coil power from a #15/54 circuit somewhere.
What's the correct original wiring and routing for the rear-window
defroster? I'm guessing I'll need to thread a new front-to-back wire (1.5
mm?) parallel to the main harness. I need to figure out where my orphan
black wire comes from -- and goes to. Do I pull #30 power from my voltage
regulator's battery terminal?
The printed wire grid on the glass passes cursory visual inspection -- no
obvious breaks -- but I haven't put a meter to it yet. Does anybody know
what the proper (disconnected) resistance for it ought to be?
You can send me stuff off-list at bert.kn...@comcast.net, if you'd like.
Bert Knupp
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