Re: New Alternator - not charging - Batt light stays on
Posted: Wed Jun 19, 2013 6:12 am
Hi all again
This post has raised quite a few comments. I thought I should clarify the position with a dynamo. The earlier test will work fine with an alternator. the rectifiers diode in an alternator ( see circuit attached by Bill) will prevent the battery sourcing current into the machine. A dynamo when not running will draw current and may actually revolve --this would confirm that it does work by the way! this is why the controllers have a cut out to disconnect the dynamo at low speed or when the engine is not running.
with a dynamo add a further bulb in the armature circuit should provide protection and prevent excess current flow until the machine speed builds up. initially bulb will light then as machine revs up both bulbs should go out then further speed the 12V/21W bulb will glow slightly as the dynamo provides some charging current to the battery. Have atached a updated sketch
Hope this helps and that the test go well
best of luck
Bob
This post has raised quite a few comments. I thought I should clarify the position with a dynamo. The earlier test will work fine with an alternator. the rectifiers diode in an alternator ( see circuit attached by Bill) will prevent the battery sourcing current into the machine. A dynamo when not running will draw current and may actually revolve --this would confirm that it does work by the way! this is why the controllers have a cut out to disconnect the dynamo at low speed or when the engine is not running.
with a dynamo add a further bulb in the armature circuit should provide protection and prevent excess current flow until the machine speed builds up. initially bulb will light then as machine revs up both bulbs should go out then further speed the 12V/21W bulb will glow slightly as the dynamo provides some charging current to the battery. Have atached a updated sketch
Hope this helps and that the test go well
best of luck
Bob