Thread: Questions--2 Electrical & 1 Hardware

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I bought a Haywire fuse/relay box for my car. In the ignition circuit, a neutral safety switch is most often used and there's a relay that transfers up to 30 amps from the neutral safety switch, whenever the neutral safety switch allows it. 12 gage wire is needed for 30 amps.

21 Fused Wiring System

A breaker or fuse only protects the wire that is upstream from it. If a wire was run to a headlight switch that has a fuse in it, then only the wire from the switch to the headlight is protected by the fuse at the switch. A fuse or breaker would be needed to protect the wire leading from the power source to the headlight switch. Without a fuse or breaker downstream from all of the wire, an accidental short to ground will fry the wire.