Ok- new project, gauge not working, reads zero, no matter how much gas.

2002 XK8.

There are THREE wires in a plug I was able to pull from the sender- which ones do I use to jumper with a resistor to trick the gauge into thinking I have a 1/2 tank?

 

Ok- now I feel dumb, I think I pulled the connector for the pressure sensor for the tank?

What wires are the sending unit?

 

Link to wiring diagram http://www.jagrepair.com/images/AutoRepairPhotos/jagxk2002.pdf

Gus
www.jagrepair.com

 

Look for a 10-pin connector (FT1) with Red/White and Black/White wires going into pins 6 & 7 respectively.

FT1 10-WAY MULTILOCK 070 / WHITE FUEL TANK / REAR

If you have a multimeter, check for between ~80 ohms (full tank) and ~900 ohms (empty) across those two pins if the sender is OK. If the reading is much higher or open-circuit, then a 390 ohm resistor across those pins should give you a shade over half full on the gauge - assuming the sender is linear.

If that doesn't do it, the wiring goes through three other connectors on its way to the IC:
BT2 pins 18 & 17
RH1 pins 14 & 13
FC26 pins 14 & 13

BT2 20-WAY MULTILOCK 070 / WHITE TRUNK / ABOVE RIGHT HAND REAR WHEEL ARCH

RH1 20-WAY MULTILOCK 070 / GREY BEHIND GLOVE BOX

FC26 / 26-WAY AMP MICRO QUAD LOCK / YELLOW - Instrument Pack

 

THANK YOU!!

I clipped the connector and some wires from my 01 that I am parting and made a harness adapter with a 110 ohm and 47 ohm resistor in series. This gave me a *little* over a half tank which is perfect for emissions drive cycle.

If anyone needs this adapter, PM me and I will send it to you to borrow (not sure what other years it will work for?)