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Old 02-27-2012, 04:42 PM   #1
Join Date: Jun 2011
Location: Waynesboro, VA
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Amps vs. what gauge wire

I'm in the process of designing a fuse block specific for my needs. I want to have several circuits that will be switched off the ignition and others that will have constant power. The switched ones I've already figured out wire size but the constants I'm wondering what gauge wire to use. Any suggestions? I've done some research and I'm guessing (ball park) it'll be about 100 amps. All the stuff I've seen says 2 gauge but I'd rather ask ya'll since you know what your talking about. Thanks for any help you can give!

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Old 02-27-2012, 05:05 PM   #2
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2 gauge seem real big. What are your planning to run at 100 amps. Or is that max. You know that the stock TJ power ground wires are only 8 gauge. And I bet 8 or 6 would be all you need for most stuff. If your really putting out 100 amp's extra I'd be worried about the alternator and battery.

Have you seen this fuse/relay box? 105 shipped. I believe they rate it at 60 amp max and use 10 gauge main power.

edit: 2 gauge is more than some winches use.

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Old 02-27-2012, 05:33 PM   #3
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I use 4awg in most car audio installs. It's relatively cheap and can handle most any other accessories. I ran one 4awg cable and one 8awg cable in my Jeep for my 2 amps.
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Old 02-28-2012, 12:49 PM   #4
Join Date: Jun 2011
Location: Waynesboro, VA
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I was thinking 2 gauge seemed a bit large as well. As for the 100 amps that is just the max that I'm looking to have. I probably won't get anywhere near it. Thanks a lot for the input guys! That's why I like this forum so much. You all know what your talking about! Also I do like that box but I am looking to have more outlets for accessories and am going to custom build a water resistant box for the location I'm going to be using in the engine bay. Thanks again for the input!
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Old 02-28-2012, 01:48 PM   #5
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Location: Malvern, PA
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I made this write up over on NAXJA:
You already have a Relay Box

You really shouldn't size wire in a 12v system on amperage alone. Length very much comes into play, as wire resistance causes voltage drop, which drives amperage up.
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