GU29703800 , BMW numbers 12321350052 and 12321244409 . Fits V50, V50 II. V50 III, Monza, V65C, V65SP, V65TT, Lario, V7 Sport, 750S, S3, 850T, T3, T4, T5, Convert, G5, 1000SP, SP II, SP III, California II, 850 LeMans, LeMans II, LeMans III, LeMans 1000 all years LeMans IV and LeMans V. This regulator can be substituted for 17703800.
Solid state voltage regulator for Bosch alternator systems as used by Guzzi from 1972-1992. Direct plug and play, accepts existing 3 prong plug and mounting points. Regulates charge voltage to correct charge rate, 14.3 volt setpoint.
Also suitable for BMW "Airhead" R series Bosch charging systems.