100 amp midi fuse?

[buba]

I've just bought a new 100amp fuse holder and with it came a 100amp midi fuse.

Is there any problem using this or is it best to stick to the old style fuse?

Thanks

[Alistair H.]

I have a midi style fuse in mine. Much better. Bigger contact patch and no chance of sliding out sideways.

[buba]

Great I'll stick the midi in and keep the other as a spare.

[pmessling]

I removed the fuse no ill effects at all many others have too.

[ukkid35]

From a LandCruiser Forum - Why you want a Fused Alternator

Coolerman said:

Under NORMAL circumstances you will never have a problem with the 10 ga wire and a 140 amp alternator as long as the battery you have installed is not larger than stock AND it stays charged.

However, lets look at a situation where it's winter, at night, and the battery has becomes discharged. You jump the truck to get it started, and let it idle to get warm. You turn on the headlights and the heater fans(s). So far so good. But then the 40 amp fan kicks on, and suddenly smoke pours out from under the hood and dash and the truck dies and goes up in flames.

What happened?

You tried to charge a dead battery = 25 to 40 amps (Depending on battery size)
Headlights = 6 amps
Park lights = 3.5 amps
Heater fan = 3-5 amps
Cooling fan = 40 amps

You were trying to pull almost 90 amps through a wire rated for 40. Worse case it goes up in smoke, best case you overheat the charge wire and melt it inside the harness.

If you have a stock harness, it came from the factory with a fusible link installed. I can sell you a replacement. That would at least blow when overloaded, and protect the vehicle from a meltdown...

[ridds]

The midi fuse is a better design as usually the fuse fatigue fails at the section between the thin fuse part and the wider clamping part.

On the midi this is encapsulated with plastic so the fuse link purely acts as a fuse not a weak flexing bit of metal.