fuel gauge

wots the most likely reason for this not to work??

not good not knowing how much fuel is in the car!

probably the sender has gone on the blink - before messing with that check your wiring.

It might be that if you connect the two wires that go on the sender (through round plate under rear seat) the gauge will read full - can anyone verify that?  This will confirm wiring and gauge is OK or not.

I think you're right Rich, it should read full when you link the wires.

I wouldn't connect them directly together as this may damage the gauge. (same as the temp gauge). 47 ohms across should indicate full tank, 220 ohms should put the needle to the reserve mark.

Best get down to your local electronics shop and buy a couple of resistors.  

hi, forgot to note that the temp gauge also isnt working! :cry:

r they linked??

gotta sort all these little, but big headache problems if im gonna sell this when i get mine back!

I think that's what you calll a clue!

They sure are linked, do you have haynes manual, they tend to have the best wiring diagrams?

If I remember rightly they share an earth.

Peter

They also share a regulated 10V feed via the voltage stabiliser on the back of the instrument cluster. This may be of use:

http://www.campaignreg…orum/viewtopic.php?t=1369

hmmmm! changed the voltage stabaliser and it worked!

but lasted about 30 seconds…..i take it this means the earth tallpete is talking about is the route of the problem?? where is this?

need a new voltage stabaliser now :evil:

good thing is that i connected the speedo cable to the clocks and it works! - other end was disconnected too… also the mpg air hose was diconected too so thats also now working!

should be sorted this weekened! this car is all comming together now! only other prob is the heaters! see my heater post!

You  should be able to trace the earth tracks on the back of the PCB from the gauges (they may also connect to the instrument panel lights), then to the instrument cluster connector pin, then back to the earth rosette.

Cheers
Rajan

Think its pin2 on the back of the instruments - but not sure.

Would be worth cleaning up the rosette anyway and see if that sorts it.

Sometimes it's worth running a separate earth to the instrument cluster particlarly if the dash is out (Come on Wellsy give is a definitive how the MFA works - you know you want to   )

Thanks Rich!! Its is pin no. 2, thats all our getting  

Wellsy

...and pin 5 for us Series 1 boys!

hmmm, changed the 3 pin diode… it worked then died again, ran a new earth nothing, maybe i need another diode….

but found there was another earth sum1 bridged from the brown earth from pin 2 going off sumwhere?? - could be immobiliser, also found that if i turn ignition on b4 putting immobiliser key in it works!!! soon as i put the immob key in and start the car the gauge turns off………

grrrrrrrr!!!! :evil:

well at least i can check how much petrol i have b4 i set off…

im thinking. new diode and get rid of that earth thats been bridged should do it..

Sounds like a good plan!