Test the dynamo/generator itself by removing the wiring from it and connecting
its F and D terminals together. Connect a voltmeter on its 20v scale between
this link and ground. Start the engine and *slowly* raise the revs. The
voltage should rise towards 20v, it should do this by 1000rpm, and don't
exceed 20v. If it does that the dynamo itself looks to be OK, so any
non-charging is down to wiring or control box.
PaulH.
----- Original Message -----
My car (MGA with original generator/regulator) is clearly not
charging the battery, so I need to investigate the charging system.
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