It's been a while since I posted...

[MeMe]

...however, when in doubt - ribnet to the rescue...

My fuel guage is jammed on FULL - I wish -

So, I've pulled out all the wires and fuses and found than when doing so it happily reverts to empty.

I have also undone the sender from the tank (50ltr inboard) and found the float moves freely but does not move the guage accordingly.

I've cleaned all the connections which when "juggles" also make the guage move.....

However, it remains showing full.

So, it aint the needle as this moves up and down, it aint the float as this also moves freely, it aint the fuses or the connections in my humble opinion....

So- what else ?

[9D280]

I assume it worked OK then suddenly started doing this?

I would guess one of two things- either you have a short on the sender unit, or you have a short with another circuit, and the guage is getting full 12V from another source. Do you get a "full" indication with the sender totally disconnected? If yes, you need to search your entire loom for a short. if not then check for shorts on the sender unit.

[MeMe]

......thanks, I'll do so at the weekend.

[jyasaki]

The sender should be a variable resistor. Full range swing is one of 2 scales, as I recall: later standard ranges from 33 to 240 ohms (empty to full); don't recall the earlier one, but I don't think there are a lot of them out there anymore.

If you've got the sender unit out, you should be able to stick an ohmmeter on the output and move the float to see if it is reading. Troubleshooting is a matter of seeing where you're losing the resistance reading.

jky