This alternator has three wires, the big lug went into the main breaker box and back to the battery, there is also a white and brown/yellow stripe. I figured one was to excite the alternator (12volt feed) and the other a signal. I'd hate to put power to the wrong terminal. Unfortunately, I lost my 99 Disco 1 in a divorce last year or I would just test for voltage on that one to find out. I don't know anyone with one either, these older Disco's aren't very popular across the pond. I think it is the lack of aftermarket parts here, jeep and toyota have the market cornered. But, neither of them, ride like a rover.
Thanks for the reply,
James Kirk