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Blood Sweat Tears and Grease => Electrical => Topic started by: black350 on Aug 01, 2017, 12:04:43

Title: Wiring Lengths - How important are they?
Post by: black350 on Aug 01, 2017, 12:04:43
How critical is the length of a wiring run? How much does the resistance of wiring come into play in this application?

I'm making a harness from scratch and I plan on only giving enough length to meet my components and a few extra inches on some runs to make changes later on if necessary.

My electronics box is small and the run from the battery + to the fuse (cb350) is only about 3 inches total. Would this be too short of a run? I was thinking I could snake the wiring around the box to give it a little more space but I'd like to be sure. Is there a way to calculate how long a run should be or should it be fine if not taken to extremes?


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Title: Re: Wiring Lengths - How important are they?
Post by: SONIC. on Aug 01, 2017, 12:07:26
On a motorcycle it doesn't make an appreciable difference. Use the correct wire gauge for the load, and minimize lengths on high load items (headlight) and you'll be fine.
There's no such thing as too short of a wiring run!
Title: Re: Wiring Lengths - How important are they?
Post by: irk miller on Aug 01, 2017, 15:23:27
There's no such thing as too short of a wiring run!
There is if it's feeding to one of the handlebar controls and disconnects connectors when you turn the handlebars.   ;) 

In most cases, voltage drop doesn't become a real issue for at least 50ft.  For a 3amp circuit, the voltage drop on an 5ft length of 18ga copper AWG is only about 1.5% which is like 1/5th of a volt. 
Title: Re: Wiring Lengths - How important are they?
Post by: SONIC. on Aug 01, 2017, 16:44:24
There is if it's feeding to one of the handlebar controls and disconnects connectors when you turn the handlebars.   ;) 

In most cases, voltage drop doesn't become a real issue for at least 50ft.  For a 3amp circuit, the voltage drop on an 5ft length of 18ga copper AWG is only about 1.5% which is like 1/5th of a volt.

I know someone would have something to say about that ha!
Very good point
Title: Re: Wiring Lengths - How important are they?
Post by: CQ Custom Designs on Sep 12, 2017, 12:58:14
I leave mine 5-6 inches longer and fold a section under my tank, it's like 3 2 inch sections stacked per wire (I use all black wires cause I know what there for) that way if I move something or put something else I have a tiny bit of wiggle room and it doesn't effect the look of the harness. I don't wrap my wires I just use all black wires solder and black shrink wrap then zip tie it with black zip ties.


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Title: Re: Wiring Lengths - How important are they?
Post by: canyoncarver on Sep 12, 2017, 13:19:28
I leave mine 5-6 inches longer and fold a section under my tank, it's like 3 2 inch sections stacked per wire (I use all black wires cause I know what there for) that way if I move something or put something else I have a tiny bit of wiggle room and it doesn't effect the look of the harness. I don't wrap my wires I just use all black wires solder and black shrink wrap then zip tie it with black zip ties.

You use all black wires?  I pity the next owner of that handiwork. 
Title: Re: Wiring Lengths - How important are they?
Post by: CQ Custom Designs on Sep 12, 2017, 13:23:43
You use all black wires?  I pity the next owner of that handiwork.
Yup! Haha that's what everyone says. But they will learn!


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Title: Re: Wiring Lengths - How important are they?
Post by: canyoncarver on Sep 12, 2017, 13:27:38
Yup! Haha that's what everyone says. But they will learn!

But why?  The same wire in different colors is cheap!
Title: Re: Wiring Lengths - How important are they?
Post by: CQ Custom Designs on Sep 12, 2017, 13:31:34
I have other colors. Cause I hate wrapping it in tape it gets nasty


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Title: Re: Wiring Lengths - How important are they?
Post by: Sonreir on Sep 12, 2017, 14:28:58
Aside from tape, other options exist. ;)