Attaching a fuse to a new set of batteries?
Due to various craziness in life, I let the batteries on my rig expire, so the only purpose they have is a core charge refund. This time around, I'm getting two 12 volt jars, using 36" 0 gauge cables...
Forum Discussion
Almot wrote:MEXICOWANDERER wrote:
If you connect a LOUD alarm across both terminals of a fuse it will screm its fool head off announcing the Four Horsemen Of The Apocolypse are there.
Will it work?
Fuse blows open - big Amps flows through the alarm and it's screaming its head off for a half a second, and then goes up in smoke because it itself becomes a fuse.
Without the alarm - when fuse blows, my lights and everything else goes out, so I won't miss it, right? May take me a minute or two to figure out what happened, this is the only difference.
It will work fine because the resistance of the alarm is much much higher than that of the fuse, and so the high current will not flow through the alarm--it will be limited to whatever the alarm usually uses. It's no different than connecting the alarm directly to the battery. This is a straightforward application of Ohm's law.
I would probably put a small fuse in series with the alarm if I were doing this, but perhaps I'm just being paranoid. (I probably would not bother with the alarm, actually, as I'd be immediately pretty suspicious that something major was wrong when all the 12V power suddenly went out.)
