If you have could you tell me what problems you encountered with the Positive Earth system on the car?
oldhombr.. I pretty much have been coming to that conclusion. Good reply.
Not actually done a Jag, but I've fitted alternators to cars such as Triumph Heralds and Morris Minors in the distant past. You do indeed have to change the system to negative earth, bypass the original voltage regulator, and re-wire the battery warning
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I diagnosed this Allis-Chalmers crawler's DC generator defunct, and converted it to a Delco Alternator.
This is for a GS bike so aparently dirt is not a problem.
This is for a GS bike so aparently dirt is not a problem.