Fuse sizes for aftermarket aux switch

[TylerV76]

Can anyone explain to me how I determine the fuse size needed for accessories connected to my Voswitch JL300?

All the bays came with 30 amp fuses. I’d like to get them sized properly for what I have connected.

I have front and rear e-lockers, arb twin compressor, smittybilt 10k winch running through a warn interrupt solenoid, and 2” rough country cube led lights.

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[4a4c55]

When sizing over-current protection, you'll want to take two things into consideration. One is the size of the wiring. The other is the expected draw of the devices on the circuit.

If you've got a line going to your dash cam, would it ever really draw more than one amp? Maybe two? So a one-amp or three-amp fuse is more than enough.

If you've wired something with very thin wire, that wire won't be able to handle much current before it gets hot, melts its insulation, and risks starting a fire or damaging other equipment or wiring around the hot spot. You can find tables with recommendations for maximum current for a given wiring size, and you'll definitely want to make sure that the expected draw of the devices on those circuits is less than the maximum safe capacity of the wire. Then, choose a fuse rating that protects the wire.

Here's one such table.

And you've got some rough country lights. I don't know which model you've got, maybe these are the ones.

Further, you don't say if you're driving the lights directly or with a relay. If your Voswitch is driving just the relay, then you just have to worry about the relay current. It's probably less than one amp.

If you're driving the lights directly, we have to figure out how much current they draw. RoughCountry doesn't say how much current the lights take. They do indicate that the light system is made of four lights, each using five watts. That's 20 watts total. At 12 volts, 20 watts is 1.67 amps. Two lights, so 3.33 amps total ... so you'll want a 5-amp fuse.

Hope that helps!