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Old 03-17-2017, 11:35 PM
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20Rubicon12's Avatar
Join Date: Apr 2012
Location: San Diego, CA
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Electrical Accessory Wiring

My electrical fears bring me to smarter people than myself when it comes to this stuff.

Just purchased a distribution box, and am getting ready to wire up my accessories that I have had wired differently. Couple questions on wire gauge, and fuses:

20" LED light bar up front:
-100W light bar. So, 100W/12V = 8.33Amps. I would just need a 10Amp fuse for that accessory? Or up to 15Amp fuse?
-Since I found this chart (please point me to another if there is something different), and I have seen people add in a factor of safety of about 20%, then the calculation I get is, (100W x 1.2)/12 = 10Amps, which at 0-6' shows 16 gauge wire.

2x6" LED light bars on the rear bumper:
-30W each light bar. So, (2x30W)/12V = 5Amps. Again just go with 5Amp fuse, or something a bit bigger?
-Same with the gauge wire (2x30Wx1.2)/12V = 6 Amps. Rounding up to 10Amps, and probably needing around 15' to go to the back of the jeep, shows 12 gauge wire again at that Amperage.

Too much overkill?

Appreciate the help!

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Old 03-18-2017, 12:42 AM   #2
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Location: Hesperia, CA
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Your not building a boat so try this chart instead try this chart instead.


The fuse it to protect the wiring not the light. It is the wiring that will cause a fire, very rarely is it the equipment. You want the smallest fuse possible to run the equipment and make sure your wire is sized correctly. Okay to go larger but never go smaller.

For your light bar a 10 amp fuse and either 18 or 16 gauge wire. For your rear bumper 7.5 amp fuse and again either 18 or 16 gauge wire. I chose 7.5 amps because it is common, 5 amps would probably blow.

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