Polarity Conversion '65 Jaguar 3.8s

I'm not familiar with this design, but my gut feeling is there will be electronics to convert the frequency from the generator into linear DC to drive a conventional meter movement.

That could be the case.

I'd ask Burlen Fuel systems. But it would be easy enough to reverse the diodes. Assuming removing the pumps is not too difficult.

I'd have thought one of the Jaguar car clubs would have the answers.

For linear read proportional.

But thinking on it, if it has extra electronics it would need a battery connection.

If you have a Jaguar of his era and the clock still works.... it's unique!

Geoff MacK

If it's a standard Smiths movement - I had one on an S Series Bentley - what usually happens is the internal switch contacts get dirty/burned. Since they're operated by an escapement they are by nature pretty lightweight. A cleaner spray will often get them going again. It's ages ago - but I don't remember it being difficult to dismantle the clock. I also fitted a diode across them to reduce the 'burning' - same as later SU pumps did. But it will never regulate to being accurate. These days I'd try using a voltage regulator on the supply to it.

The next generation Keinzel? clocks were a half decent clockwork movement electrically wound which were pretty good - before 'quartz' became available.

My P6 has a Kienzle clock. Still keeps pretty good time as well.

Main snag with those is you can't easily fit a voltage sensing alarm - ie the type that uses the interior light coming on, etc, to trigger it. As each time the clock is wound by the motor it triggers the alarm. In theory you could reduce the current taken by the motor with a resistor and capacitor but it wasn't reliable enough.

Who in their right mind would want to fit an alarm to a P6 in the first place?

Mine was stolen once and the rear bumper stolen on a second occasion so yes I did fit an alarm/immobilizer