properly fusing wires

How exactly do you know how to fuse a wire? Is it like this? (example) There is one power wire, 2 amps, and a dist. block. The amps are fused like so, one amp has 4 20amp fuses, and the other has 2 20amp fuses, at the dist. block, I would fuse the amp with 4 fuses in it with an 80amp fuse, and the other with a 40amp fuse, and at the battery with a 120amp fuse??? I am kind of confused on the fusing situation as you might tell. If someone can explain this or take me into detail, I would greatly appreciate it.

Your fuse values are good. Just make sure you are using wire big enough to handle the current load going through them.

ok than thank you, one more question then. How would I know how to fuse a wire that I am gonna add something to a car? Let's say I was gonna add some neon lights to turn on when the door opens. I would use a relay, but what fuse amperages would I use, I would need 2, one for the constant power on the relay, and another for the constant power for the neons.

anyone like to answer?

fuse everything that you add to your car. it should come with a fuse if its neons. use a relay for light current applications that a switch wouldn't be able to handle.. also fuse a close to the power source as possibleWhy oh Why didn't i take the blue pill

Darren Power

great powermyster, thx.

A fuse or circuit breaker is a protection device. It is designed to only let a predeterminded amount of current flow thru a conductor. You must fuse the end closest to where the power originates. In the case of adding an amp, lights, etc. you need to fuse within 18" of the battery. The fuse will protect the wire from shorting out and causing fire. There are charts avaialable for what gauge of wire vs. size of fuse. Examples: 40A for 8 AWG, 30A for 10 AWG, 20A for 12 AWG. As for your amps, I would run a 2 AWG welding cable with a 100 or 120 Amp Circuit breaker (18" from battery)back to your fuse block. The 80 amp I would run a 4 AWG and the 40 Amp a 8 AWG. A 2 AWG ground with a disto will work. Keep it short!(Notice addition of the fuse when the wire size) Fuse 18" from the battery. Use Grommets thru firewall. Fuse every time you change change wire guage! Select the right fuse or C.B. for the size of wire you are using. Hope this helps!

WoW that was just the explanation I was looking for audiocableguy, that REALLLLLY helps me out.