Horn Relay and "What are these wires" - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 03-22-2016, 10:51 PM Thread Starter
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Horn Relay and "What are these wires"

Hi everyone,

While I'm working on converting my bike, I have a couple of questions that someone might know in the electrical section.

I've got some nice horns that come with a relay. My question is that if I wire the relay directly to the battery (with a fuse) and use the stock horn wire as the trigger, will the relay be an electrical vampire while the bike is off? I want to know whether to use a switched 12 volt source or power the relay from the battery.

I can say that I haven't searched the manual due to time, but before I do, I want to know what these dangling connectors behind the right-side cover are for. I just want to know what they might be availble for (see image below)

Thanks,
JT
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post #2 of 4 (permalink) Old 03-23-2016, 11:54 AM
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I've had a relay'd horn mounted on my bike for a couple months now, and there's no battery drain with it. I'm not a hugely experienced electrician but my understanding is that a relay basically takes a weaker electrical signal that's coming from the stock horn wire and uses that power to close a connection between the wire going directly to the battery and the new horn. So if the switch isn't being powered, there is no connection = no current draw = no battery drain.

1995 VN750:
Ear shaved, re-jetted with 142/42 & 2 needle shims.
New modified front end with Maier GP fairing, half-ape handlebars, supersport grips and bar-end mirrors.
Stock seat, cut and modified to remove the passenger backrest.
Factory-Spec Sportster shocks.
Self-fabricated rider's backrest.
Engine guards and highway pegs.
Custom-made straight pipes, fiberglass-wrapped exhaust.
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post #3 of 4 (permalink) Old 03-23-2016, 12:30 PM
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Yup, when no current is coming from the 'trigger' wires of the relay, the 'triggered' circuit is open and no current flows.

The dangling connectors are the 'accessory' leads, and can be used for exactly what you're doing. They are 'always on', not relying on the ignition switch.
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post #4 of 4 (permalink) Old 03-23-2016, 03:38 PM
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Found this reading through the verses: https://www.vn750.com/forum/40-electr...cessories.html
Has some details that may be of interest.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
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