I had originally alternator rebuilt installed like it was not belts squeal?

 

If your mystery car has the AJ16 engine, I would suggest you look at the CRANK DAMPER for 'delamination'.

 

The other wire to the voltage regulator ( inside the alternator ) is the gauge indication

This is the round 2 wire connector on the alternator

There are 2 or 3 fuses in the left heelboard fuse box for the instrument cluster

Did you check the voltage on the B + post of the alternator before changing it

An easier check point is the large terminal post on the inside the engine compartment right front wheel well near the rear firewall

The alternator B + heavy battery cable ties into the starter solenoid on the way to the right wheel well terminal post and this rear section would normally be referred to as the starter cable

The valve cover is not a good ground point

You should see 13.5 to 14.5 volts which is above the fully charged battery of 12.75

 

Fully charged lead-acid battery is 13.2 volts. Will usually settle at 12.8.

1998 XK8 convertible.

 

Sorry wrong topic

 

I see your newer alternator upper and lower brackets are very similar to factory

In alternator issues if you take the original Denso brand alternator to a dedicated alternator / starter shop in town may have more controllable results then an out of box rebuild or new that you don't know what in the world

Some parts are here , your voltage regulator is a IN435 for 120 amp Denso original

# IN435 Voltage Regulator for Denso Alternators, 12 Volt,On: Asuna (1993-1993) , Geo (1990-1993) , Isuzu (1990-1993) , Jaguar (1993-1997) , Jaguar - Europe (1994-1997)

In the states , the local auto parts stores have a removed alternator spin up machine in the back room to give you some specific information on current alternator albeit not in real world conditions like heat and load