Temp gauge not working? Replaced the sending unit? Can't find the problem? (XJS,Older models that have been around awhile). Electronic odometer not working but speedometer is? Mine weren't until I changed my battery (I took off the cover which hides everything). On the right of the battery there are two bolts (above the anchorage for the negative battery cable). Where a bunch of ground wires are attached. Mine were rusty and crudded up. CLEAN these and you may very well solve the above mentioned problems. I'm like giddy, NEVER have I fixed something so important in so little time and effort. I hope this helps someone else that has been driven crazy by these cars. They're a P.I.T.A. but when they work right...what a car! Bud Cheers!!

 

Good work!

Now spend a Saturday going thru the entire car cleaning every ground point, fuse clip, and electrical connector/contact you can find. When you're done you'll have preemptively solved about 90% of the much ballyhooed "Lucas, Prince of Darkness" problems.

Repeat every 10-12 years :-)

Cheers
DD