BASIC HARLEY WIRING DIAGRAM


Wiring your Harley. 

The first thing to do is to find the wiring diagram that best suits your bike. 

1- Disconnect your Battery and remove. Earth wire first!! Remove you existing wire loom, if any. (You may be able to use some of the outer covering later.) 
2- I’m assuming all your electrical components are in place, eg: Headlight, Horn. 
3- Using a minimum 14 gauge strand Automotive type wires, select your colours for each component and route the wires connecting components. Work with only one wire at a time, and leave an extra 4 inches of length per side as insurance. 
Tag each wire end and write WHERE IT GOES. Tape the wires to the frame so you have a rough wiring loom. 
4-For the Battery and Starter Motor use at least 10 gauge wire. 
5- Once you have all the wires laid out, route them so they will not be in danger of rubbing or dangling. You can now make a wiring loom and touch each wire end to the component it’s attached to. Without removing the tags, cut each wire down so you have 1 inch over the required length. Remove the loom. 
6- You are now ready to affix terminals to your loom. Do it on a clean flat surface, make sure the soldering iron can be used safely. If you have kids this is a time you don’t want them around. 
7- Avoid using spade or horseshoe type connectors, over time they have a tendency to open up or spread. Use eye type terminals that fit the studs or terminals on the components. These will tighten up nicely using star washers. 
Don’t hook up wires without connectors, it’s a disaster waiting to happen. 
8- Crimp or solder terminals well, I prefer to do both. Do not over crimp, excessive force will end up with a bad connection. Always use the appropriate size terminals for the wire gauge being used. 
9- Avoid splicing wires in the middle of a circuit if you can run one wire instead. 
10- You can now install your wiring loom, use tie wraps every 6 inches or so and route the loom away from contact with heat. You should be able to install it so it’s pretty much hidden from view. 
11- After you finish and before connecting the battery, Double Check Every Connection! Better to be safe than sorry. 
12- Connect the battery, positive first and test every circuit.