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Lucas 75A Alternator Performance
Lucas Alternator Output

Lenny Berk purchased a rebuilt Lucas 75A alternator for his '83 Jaguar XJ-S, and it came with a printout of the test results on that particular unit.  On the theory that one properly-functioning  Lucas 75A alternator probably performs pretty much just like another, the printout is shown below for the edification of any and all owners of cars with similar alternators.

When looking over this graph, keep in mind that alternator RPM is not the same thing as engine RPM.  The alternator turns considerably faster, perhaps 2 or 3 times as fast, thanks to the difference in pulley diameters.
 

 

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