Sender unit wiring GT

[1.9 GT]

My diagram shows light blue/black wire hot and ground, I have the hot wire and a double white wire in heavy black sheathing with eye end and a brown wire also in black sheath with eye end which looks to be ground from heated rear window. Can I use sending unit to ground rear window defroster and is other wire a ground or have I missed something in wiring the rear lights.

[blancojp]

Ground for the rear lights on a GT comes from several wires attached to the body via a philips screw. You can find this screw on the back light center re-inforcement or you will see a hole there. If you vehicle has the engine ground strap, pretty much any part of the rear can become a grounding point.

[namba209]

If you're referring to the heated rear window relay and associated wiring, here's what the DESTEC schematic shows. Actual relay ground (Gray/Red Wire) comes in from the heated rear window switch through the Yellow IP connector #1, the relay power Pin # 85 comes in from (Lt Blue/White) goes to I P Yellow connector #6 and to the voltage regulator. From IP Yellow connector #6 to the ammeter lite. Actual power for the circuit comes from a Red wire spade lug from the AMP L stud to pin #30 on the relay. Power then goe to the window filaments from pin #87 and the ground is a separate brown wire from the filaments. There is a fuse shown in the schematic between pins #30 and #87. There are no other wire colors shown, so I can only guess what the PO did in there. HTH.

[1.9 GT]

I have wired all rear lights with 4 grounds on rear psgr side and 3 on drivers side. Light Blue/Black wire to female end on fuel sending unit. The brown wire coming down drivers rear wheel well grounded to sending unit.(rear window defroster) The other wire(double) looks pretty much original to sheathing trough out car and comes from main harness on drivers side. The round end connector has been a ground through out wiring the car however the color of the wires (double white) has me miffed.

[namba209]

The rear harness makes its way forward under the floormat on the driver's side up to the top of the kick panel. Maybe you can follow it from there to the fuse panel and see where they go from there. The only solid White wires go to the high beam side of the headlights from the hi-lo beam relay.