Some fun tonight! Rolls b80 dynamo inside. in Lubrication, Batteries & Electrics Posted March 31 Looks like you have Generator No.1 which is rated at 12A 28.5v there were two types of Generator Panel looks like you have No.1 Mk 1 a later rather different panel was No.1 Mk 2/1. Both of these panels are very hard to find, but the good news is that I have seen people fit the Generator Panel No.2 Mk 1 which is the 25A panel intended for the Generator No.2 Unlike the Generator No.2 which has a gearbox, the No.1 can be tested by running it as a DC motor. Via say 15A fuse energise the field winding (C & E) & via another fuse energise the output winding (A & B) & the dynamo should rotate as a motor would.