48-50 F1 headlight switch glass fuse help 6v
 

Hi Guys, I have a aftermarket headlight switch (older style) in my truck which is still 6v I have newer wiring kit I updated the truck with. I'm having hard time trying to find what amp fuse to use with the switch with the 6v system. The headlight switch is the only glass fuse I see in the whole truck. Been told glass fuses where never used in these trucks.

Any help would be great.

Thxs a million

Best Regards

Cody
Michigan

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Re: 48-50 F1 headlight switch glass fuse help 6v
 

They had circuit breakers.

Re: 48-50 F1 headlight switch glass fuse help 6v
 

The fuse on your aftermarket switch would only power all of your lights so as long as all your lights are all factory original specs then a 20 amp fuse would be OK. If any bulbs are higher wattage than factory specs then the total current draw (amps) through the switch would have to be measured. Regards, Kevin.

Re: 48-50 F1 headlight switch glass fuse help 6v
 

Yeah like Bob said you want a breaker. These were thermal, slow-blow types so a quick transient overload will not blow it and if it still does it will automatically reset when it cools off. This doesnt mean you will get the lights back necessarily but at least you have a chance before running off the road. They are still available I believe.

Re: 48-50 F1 headlight switch glass fuse help 6v
 

You should have two breakers behind the instruments.

Re: 48-50 F1 headlight switch glass fuse help 6v
 

Re: 48-50 F1 headlight switch glass fuse help 6v
 

when we did my complete rewire we added a few in-line glass- period correct type buse fuses to certain accessories that really needed it. Like an engine compartment light for instance was one example. If that goes it'll catch fire. Ask me how i know. I would add that to certain accessories like a cigar lighter, heater, or additional lighting if you have any of that stuff. It could really save you.

Re: 48-50 F1 headlight switch glass fuse help 6v
 

Yes, Yes we all know it should have circuit breakers as originally fitted but it has a new non original wiring kit fitted and all he wanted to know was the value of the fuse on the replacement headlight switch. Many cars had fuses and not circuit breakers. Circuit breakers are safer because if there is a short in the lighting circuit then the breaker contacts will open for a short period and then close again quickly when cooled and possibly give you lights again. Regards, Kevin.

Re: 48-50 F1 headlight switch glass fuse help 6v
 

The wire gauge is what designates sizing of circuit protection. Breakers and fuses protect the conductor wire. 6-volt systems require larger gauge wire then 12-volt systems. You can use a lower rated fuse to protect a wired circuit but you can't use a higher rating than the wire requires or the wire could burn before the fuse.

I use the FAA advisory circular AC 43.13-1B chapter 11 to find fuse and circuit breaker ratings for the different American Wire Gauge sizes.