We've just finished putting a new motor in Carl (Fletch)'s 72 & its got a new dynamo fitted. Looking at new v old, the only difference is the connections - the old had D+, Df and D- (red, green and brown respectively). The new dynamo has terminals labelled with B prefix and we wired the connections up in like locations. Upon starting the engine, the red warning light refuses to go out - we have checked the dynamo output and its spot on, ranging from ~12v up to 35v, the battery holds between 12.07v to 12.27v & we went a run round the block with the lights on and this remained consistent showing no signs of voltage loss (which we would possibly expect if the dynamo was not charging). We have not got any ideas of the wiring to check to see why the charge light doesn't go out, could it be the regulator has gone? Any ideas please?
Is your/the bulb holder origionals ?i.e. have you ever changed them?also is it making good contact(the bulb holder body ) with clock rear/body?is batt , from tickover revs showing increase in voltage when reved?
I don't know if the bulb holder is original - I guess so (its not my bus so I cant check) but its perminently lit. The dynamo shows a voltage increase if you connect the meter directly onto it, its from 12 to 35v depending on revs - which is spot on as per Haynes. We cant decide if the voltage regulator has gone, all we know is the battery voltage shows no loss with min of 11.96v to 12.27v with the lights on
Well as the regulator regulates as yours seems to be doing I would be looking for a perhaps simple (non 2 expensive )fix, on my own I have green ,red and the big fat one (red& white) going to voltage reg> on mine the spades are sized for proper/correct conection,not so for your own?for myself ,I would expect a higher output to show if vehicle reved hard with multimeter probs across batt. terms ,have you done same?
