Fuses How big?

nhusa

nhusa

Well-known member
I am going to put a fuse and shutoff switch in the wire between the starter and junction block of my 31 Town sedan.

This would make it easy to shut things down while storing the car and provide protection for all of the electrics. - The switch would be easier than disconnecting the battery.

I realize that it is a two way street -battery to electrics and generator to battery - and see that the ammeter says it is sending 12 amps to the battery when it is low.

I would like to know what size fuse I need and it would help to chose the correct switch. 15 Amps? 20 amps? 25 amps?
 
nhusa said:
I am going to put a fuse and shutoff switch in the wire between the starter and junction block of my 31 Town sedan.

This would make it easy to shut things down while storing the car and provide protection for all of the electrics. - The switch would be easier than disconnecting the battery.

I realize that it is a two way street -battery to electrics and generator to battery - and see that the ammeter says it is sending 12 amps to the battery when it is low.

I would like to know what size fuse I need and it would help to chose the correct switch. 15 Amps? 20 amps? 25 amps?
Click to expand...

At 6 volts, I think 15 would be too low. Mine came with a 20 and works with headlights and an aftermarket turn signal. 25 would likely be OK too.
 
I put an in-line spade type fuse holder in the power feed to the engine harness....

I'm using a 20 amp and no problems....but I carry spares of course...
 

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Fuses protect the wires from catching fire. You size based on the smallest wire gauge to be protected through the fuse. See the link in #4.
 
Thanks It is exactly what I need...
I have a few blade fuse holders left over from am Alfa Romeo project that I'll look at using. (Italian fuses in a Model A?)

I figure that a switch that will handle over 30 amps will also be OK for a main shutoff. (not battery to starter)
 
Fit the fuse if you like but for the switch, I think it is both more convenient to use and better to cut the power supply altogether by using the appropriate switch available from the vendors. I mount the switch on the front of the seat riser or as in my Tudor, on the cross member and a hole just large enough for me to put a finger through to operate the switch. The hole is hidden by the carpet.
 
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