" From: Tom Jennings <tomj@xxxxxxx> " " " Bigger alts need more field current, but not much else changes. A " reg from a 55A alt should be simply a bit heavier-duty than one " from a 21A. (It might get hot vice-versa.) true in general but not in detail - the moto 35a, 42?a, and 55a all use the same regulator; they all have the same field. " If you can find the pinouts for the regulator, you can get it to " work, if it's any modern-ish alternator 20a - 150a. There might be " exceptions, but probably not very many. full schematic of the moto reg in the '66-'68 tsm. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought