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Discussion Starter #1
How do you determine what amp fuse to use for a given widget? I'm assuming a heated jacket liner would need a beefier fuse than a 12v outlet, for example. I thought I'd read somewhere that there's a formula for this but I'll be damned if I can find it now. I have a Blue Sea fusebox, if that matters.

Also, what gauge wire is preferable? I used 12 gauge for the connection to the battery and 14 gauge for connecting to my widgets. Have I done something stupid or is that about right?
 

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Volts X Amps=Watts

Examples electric jacket:
12v X 7amps=84 watts

I use this site as my reference for electrical wire needs.
http://www.powerstream.com/Wire_Size.htm
Not all wire is created equal, and your always better going bigger than smaller. I've started a small fire when I used the wrong size wire and it heated up dramatically! (not on the bike)

Keep in mind that if you plug in your electrical farkles into the socket, it needs to be wired heavily enough for the biggest accessory you plug into it.

You should also look into a relay if your worrying about accidentally draining your battery by leaving accessories on. Its very nice, and not expensive either.
 

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Discussion Starter #3
Thanks Zed. Because I'm a gimp with electrics please bear with me...

So the volts x amps math tells you how much juice the fuse you've chose can handle, is that correct?

What fuses would typically be used for running things like a GPS or satellite radio from a 12v socket? Trying to understand this stuff is making my head spin. And yeah, relay=good. I used to leave the grips on my SV turned on all the time so a relay is definitely a requirement for me.
 

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FORUM GODFATHER.....R.I.P. PAT
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The power connector for my GPS has a 3amp fuse in it. The vest with optional gloves et al has a 10amp fuse in the stock connector. The purpose of a fuse is to protect the wiring yet allow enough power to supply the needs of the device. You ought to be able to find what size fuse comes with the power leads for any device you own. Use that size fuse in the fuse box and use the table to determine the minimum size wire you need to supply the accessory from that fuse.
 
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