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post #1 of 8 Old Jan 19th, 2015, 6:50 pm Thread Starter
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What wire size for different accessories

I recently bought a fuze block and would like to run maybe four or five sets of wires to the front of the bike for a GPS and future accessories. Not sure what right now but a few things I can think of are, powered antenna, PIAA lighting, satelite radio, etc. What gauge or gauges would be best?
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post #2 of 8 Old Jan 19th, 2015, 8:20 pm
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Re: What wire size for different accessories

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Originally Posted by pdrrock View Post
I recently bought a fuze block and would like to run maybe four or five sets of wires to the front of the bike for a GPS and future accessories. Not sure what right now but a few things I can think of are, powered antenna, PIAA lighting, satelite radio, etc. What gauge or gauges would be best?
So are you asking about wire gage? Also might I ask what model bike?

John Baker

2005 BMW K1200LT
1979 Suzuki GS1000E
1978 Honda CB350
1975 Suzuki GT380
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post #3 of 8 Old Jan 19th, 2015, 9:42 pm
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Re: What wire size for different accessories

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Originally Posted by pdrrock View Post
I recently bought a fuze block and would like to run maybe four or five sets of wires to the front of the bike for a GPS and future accessories. Not sure what right now but a few things I can think of are, powered antenna, PIAA lighting, satelite radio, etc. What gauge or gauges would be best?
In general on a motorcycle most runs are under 15' (remember you have to think of total circuit if you are running the ground back to the FuzeBlock area. If you are using 10A or less, then 18 gauge would be fine. You could get away with 20 gauge for anything 5A or less. Personally I run 18 gauge for pretty much everything unless it is higher current (sockets for heated gear) or a long run, and then I will go to 16 gauge.

1973 Yamaha 250 Enduro (crash and burn)
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2003 K1200LT - Black (for sale)
2005 K1200LT - Ocean Blue Metallic

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post #4 of 8 Old Jan 20th, 2015, 8:44 am
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Re: What wire size for different accessories

For the PIAA lights, I would suggest powering direct from battery. The relay system is often tapped from a light or heated seat circuit for 'key on' power.

Scott and Theresa
Munising, MI
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post #5 of 8 Old Jan 20th, 2015, 9:15 am
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Re: What wire size for different accessories

West Marine has a nice chart and table on DC wiring here. You need to determine what the accessories draw and then size accordingly. For sockets that will see multi-use you need to add a margin for growth . Your heated gear might not draw as much as the compressor you need to inflate that flat tire.

Greg
2014 R1200RT
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post #6 of 8 Old Jan 20th, 2015, 4:14 pm
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Re: What wire size for different accessories

You should avoid direct hook up to the battery, unless you have a relay system. On the other hand, FuzeBlock already has a relay, so you are okay.

You should be okay to use 18 gauge wire for the most part using up to 7.5A and maximum distance of 5 ft. If the distance is much more, which I doubt, then bump the gauge by 1 step to 16 AWG. This will also give you more amperage.
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post #7 of 8 Old Jan 20th, 2015, 6:17 pm Thread Starter
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Re: What wire size for different accessories

I'm sorry. The bike is a 2005 k1200lt. Since I am not sure what else I might be running in the future I was looking for a general idea before I put the bike back together. I think two 20's and two 18's would be sufficient. I'll do a little more research on a couple of accessories I'm thinking of. Thanks for your info.
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post #8 of 8 Old Jan 21st, 2015, 6:01 pm
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Re: What wire size for different accessories

That might be enough? But, consider this, wire is cheap since the lenghts needed for an LT are short, AND, it is a Pain In The Ass to have to go back and install more wirers. As a result, consider running more pairs than you think you need, label them on both ends, tie them together to make a harness, install the harness with fuse holders and you might not have to take everything apart again to add something else.

I buy mil surplus, silver coated, stranded copper wire, with Teflon insulation. Teflon has a lot higher melting temp than plastic so it's easier to solder without melting the insulation and its a lot tougher than plastic in case it vibrates against something.

surplus wire can be found on ePay, different gauges and different colors. Remember to run pairs of wires inside the handle bar covers in case you want to instal any switches to control anything. For that the wires can just enter the nose cone area so that you can access them in the future.

Bob

"He was a foul caricature of himself, a man with no soul, no inner convictions, with the integrity of a hyena, and the style of a poison toad." H. S. Thompson
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