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Rear Defrost Wiring


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So my car has rear defrost with the switch connected at the dash and the defrost back glass of course. The problem is that only the connection point at the right side of the glass has the wire connected. The driver side connection point is bare.

So my questions are:

1. Where does the wire come from to connect to the driver side connection point on the glass? There is a wire separated coming from the wire bundle that runs along the driver side back there, but it doesn't have the proper style connector for the defrost connection tab at the glass, so I have no idea what it may have been connected to at some point.

2. Is the connection point on the right side a simple ground (because that is what it is on mine anyways)?

3. Any idea why the PO had ran a wire from the inigition coil to the trunk? It is just back there but not connected to anything.


1974 2002

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Brown wires are always grounds on 2002s (unless a PO has messed with the wiring); so the brown wire coming off your defroster grid is the ground. FYI most 02s defroster grids have either partially or totally died by now, unless the backight has been replaced so even with it properlly connected it may not function. Check archives for troubleshooting.

As for your third question:

Any idea why the PO had ran a wire from the inigition coil to the trunk? It is just back there but not connected to anything.

He was gonna power something that only worked with the ign on--like a trunk light or something similar...


'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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  • 8 years later...

I am planning to have the car into an upholstery shop on Tuesday to have the headliner fitted.  Whether it works or not, I plan to plug in the two wires for the rear glass.  Do they come out of the parcel shelf which is where they go into interior or do these come out of the headliner C-Pillar?  Any photos? 

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