24-04-2020, 09:59 PM
(This post was last modified: 24-04-2020, 10:33 PM by Bob Culver.)
Hi Bela and co
The basic dynamo test is to remove external connection, link D and F, run briefly and observe volts to earth. Should be 20,30 or so. Almost certainly proves dyn OK. Must reconnect the lead and once generating must establish connection to the battery via cutout. The dynamo is not regulated. The battery simply soaks up any charge, reduces the field volts to 6 or fraction of and drags the output down to 6. Reasonable overcharging did not greatly shorten life of older style batteries. All older cars were in the same situation. Any serious overcharging has to be managed by the Summer/Winter switch and by use.
Do not prod the cutout or it will lock and heat the dynamo. Disconnect battery to release or pull open.
The basic dynamo test is to remove external connection, link D and F, run briefly and observe volts to earth. Should be 20,30 or so. Almost certainly proves dyn OK. Must reconnect the lead and once generating must establish connection to the battery via cutout. The dynamo is not regulated. The battery simply soaks up any charge, reduces the field volts to 6 or fraction of and drags the output down to 6. Reasonable overcharging did not greatly shorten life of older style batteries. All older cars were in the same situation. Any serious overcharging has to be managed by the Summer/Winter switch and by use.
Do not prod the cutout or it will lock and heat the dynamo. Disconnect battery to release or pull open.