Re: Lucas alternator test
Posted by Stuart on November 22, 2017, 9:05 pm, in reply to "Re: Lucas alternator test"
Hi Mark, |
Just to clarify, the RM19 is neither a "50s" one nor a "6 volt type" nor a "12v one"; the RM19 was supplied to all bike makers (and a few others) for all their bikes from '62 to around '68/'69; it was the first to use the now-standard 74 mm. OD rotor (earlier are 70 mm.), "6v" and "12v" are DC so nothing to do with the alternator, which produces AC, Volts varying with rotor rpm; it was supplied during the years when certainly the bike makers changed from 6V to 12V (DC) so whatever coil resistance values your found apply equally to any RM19 stator.
>I'm sure the problem is elsewhere (overcharging), possibly incorrect wiring of the light switch but he's bought the bike as "restored" and is reluctant to get the spanners out....
If it's overcharging, by definition, there can't be anything wrong with the alternator.
If it really is overcharging, I can tell you the first place to look will almost certainly be certain wiring to both the "Lighting Switch" and the "Ignition Switch"; although the bike might've been "restored", if the restorer used certain wiring diagrams (among them some of Triumph's own), they have several misprints that render them useless as either assembly guides or diagnostic tools ...
Happy to go into more detail either here or in a pm; first questions:-
. Bike make, model, year?
. Are the DC electrics 6V or 12V?
. As far as your friend knows, are the electrics standard? If not, what changes have been made?