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Tom Endy · 08-09-2020, 10:43 PM

The traditional installation of a fuse for a Model A is to mount it on top of the starter. It is then electrically located between the battery and the generator (or alternator). Should the fuse blow while the engine is stopped, you will not be able to start the car because the ignition circuit is not being powered by the battery. Should the fuse blow while the engine is running, the engine will continue to run because the ignition circuit is being powered from the generator (or alternator), not the battery. The danger here is that the generator (or alternator) does not see the battery and no longer has a voltage reference. The generator (or alternator) will then run wild with the voltage raising to levels that will do damage to the generator (or alternator).

Tom Endy

08-09-2020, 10:43 PM	#3
Tom Endy Senior Member Join Date: May 2010 Location: Southern California Posts: 3,131	Re: ALT Fuse The traditional installation of a fuse for a Model A is to mount it on top of the starter. It is then electrically located between the battery and the generator (or alternator). Should the fuse blow while the engine is stopped, you will not be able to start the car because the ignition circuit is not being powered by the battery. Should the fuse blow while the engine is running, the engine will continue to run because the ignition circuit is being powered from the generator (or alternator), not the battery. The danger here is that the generator (or alternator) does not see the battery and no longer has a voltage reference. The generator (or alternator) will then run wild with the voltage raising to levels that will do damage to the generator (or alternator). Tom Endy