Toystoretom
Living Legend
- Joined
- Feb 25, 2006
- Messages
- 2,449
HeR3tic wanted to know where it would be most convienient to hook into the stock wiring harness to install an aftermarket horn, so I did a little digging around.
I turns out that the horn is activated by a switchable ground, which means that 12 volts is supplied at all times to the horn when the ignition is on. The horn "honks" when you press the horn button, which completes the ground circuit.
If you look at the stock horn you will see two small electrical connectors that plug onto the back of the horn. One has a single Purple/black wire going into it, and this is the switchable ground wire. The other plug has two Black/Blue wires going into it. The reason there are two wires here is because this is the 12 volt "hot" wire and it also feeds twelve volts to the front brake light switch. These wires go into a sheath and dissappear under the gas tank. This is a very simple circuit, it is supplied 12 volts by the ignition switch and there are no relays of fuses in it. It is fused on the backside of the ignition switch.
These wires end up going into a main harness and then are split off to the ignition switch and up to the horn button on the handlebars.
You don't want to cut into the Black/Blue hot wire as you may end up killing the front brake light switch. The best thing to do is raise the tank, remove the black plastic trim from the frame just above the right side of the radiator, unplug the two connectors from the back of the horn, and pull this harness back under the gas tank area.
This harness is about a foot long and you can now move it twords the back of the bike, or to the side if you are going to mount horns on your crash bars. Simply make up some extension wires by crimping some spade connectors onto the ends of the wires and plug them into the horn connectors that you just moved. You can run these extension wires to your new horn or if you want to get fancy now would be the time to wire in a fuse and a relay. A relay setup would give you added amps if your new horn is a current hog.
To sum it up... there are no wires or relays under the side panels that will work. It would be easiest just to use the stock harness under the gas tank area verses splicing into the handlebar harness.
HTH... Tomo
I turns out that the horn is activated by a switchable ground, which means that 12 volts is supplied at all times to the horn when the ignition is on. The horn "honks" when you press the horn button, which completes the ground circuit.
If you look at the stock horn you will see two small electrical connectors that plug onto the back of the horn. One has a single Purple/black wire going into it, and this is the switchable ground wire. The other plug has two Black/Blue wires going into it. The reason there are two wires here is because this is the 12 volt "hot" wire and it also feeds twelve volts to the front brake light switch. These wires go into a sheath and dissappear under the gas tank. This is a very simple circuit, it is supplied 12 volts by the ignition switch and there are no relays of fuses in it. It is fused on the backside of the ignition switch.
These wires end up going into a main harness and then are split off to the ignition switch and up to the horn button on the handlebars.
You don't want to cut into the Black/Blue hot wire as you may end up killing the front brake light switch. The best thing to do is raise the tank, remove the black plastic trim from the frame just above the right side of the radiator, unplug the two connectors from the back of the horn, and pull this harness back under the gas tank area.
This harness is about a foot long and you can now move it twords the back of the bike, or to the side if you are going to mount horns on your crash bars. Simply make up some extension wires by crimping some spade connectors onto the ends of the wires and plug them into the horn connectors that you just moved. You can run these extension wires to your new horn or if you want to get fancy now would be the time to wire in a fuse and a relay. A relay setup would give you added amps if your new horn is a current hog.
To sum it up... there are no wires or relays under the side panels that will work. It would be easiest just to use the stock harness under the gas tank area verses splicing into the handlebar harness.
HTH... Tomo
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