XJ6 & XJ12 Series I, II & III 1968-1992

How to adjust volt guage

 
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Old 06-18-2019, 12:25 PM
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Default How to adjust volt guage

When I bought my 87 and started the long drive home I noticed the volt meter was showing low voltage. I stopped at Lowe's and bought a nice digital multimeter and confirmed voltage was correct with engine off and also with engine running. Took the dashboard out yesterday for my new woodwork and tested the volt meter. You can see in the photo below the difference between XJ6 guage reading and the true voltage (at the battery with engine off). Also, the guage climbs up to this reading very slowly. Like maybe 60 seconds with a lot of tapping on the glass.

The next photo shows the back with what looks like a little adjusting shaft. It doesn't seem to turn. Anyone know if that is supposed to be an adjustment knob? Any other suggestions? Thanks for your help.


 
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Old 06-18-2019, 01:33 PM
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Second photo didn't seem to post. Here it is

 
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Old 06-18-2019, 01:37 PM
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those gauges are always like that, curiously, in my '65 S type they are a lot more accurate.

I guess what you mean by "adjusting" is to calibrate?
 
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Old 06-18-2019, 01:55 PM
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If I am not mistaken, that adjustment(if it is) will allow you to zero the volt gauge.
My car suffers with the same issue, but once accelerate or I am driving the car the gauge reads correctly. I will just live with it until somebody comes up with a fix.
 
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Old 06-18-2019, 08:09 PM
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That IS the calibration adjustment, yes. No idea why it won't turn. Try harder; if you break it, replacements are cheap and easy to come by

As for the lazy operation, well, every Ser III I've owned or driven had a lazy voltmeter...both Lucas and Veglia gauges. Weird.

Cheers
DD
 
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Old 06-19-2019, 08:20 AM
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Doug, you are a genius. That little shaft on the back of the volt guage adjusted the volt reading just like you said. For others that want to adjust (calibrate) theirs, counter-clockwise raises the volt reading and clockwise lowers the reading. And it is very sensitive, a slight twist changes the reading by a couple volts.

Jeff
 
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Old 06-19-2019, 09:38 AM
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Hmm.
I've never had trouble with Nix's volt meter, if anything it reads a couple volts high which given her age surprised me a little.. However, I've never had Any electrical trouble with that car.

It was obvious when I got into the dash and under the console that a Lot of work had been done, but if the snake doesn't bite you, you never know it was there. I'm thinking the PO, at the time of Restoversion also had all the electrics fixed.

That almost makes up for all the things he Lied about. Almost.
(';')
 
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Old 06-19-2019, 10:18 AM
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Elinor, that is why one never buys a car sight unseen, most car sellers lie, misrepresent, distort. There are always exceptions.

When I decided to buy a classic S type, I flew to Oakland CA. to see it in person. I just did not believe the pictures I was sent. Turned out the owner was a famous shipping broker from World War 2 fame, with posters of himself and President Eisenhower in his office, for having helped in the war effort in the Pacific. I had to eat my doubts for this man was an honest war hero in his 80's. The car was pristine as he described it and it brought me back to Tennessee 2,900 miles away. Rest in Peace Ted Rausch.
 
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