Aftermarket horn -- Intermittent

[Brainless]

OK, What gives?

I've made this mod to at least 5 other bikes. The Monster doesn't seem to like it:

I bought a Wolo BadBoy air horn and have tried to install it in 2 ways:

1) with a relay
The relay actuates off and on.

2) without a relay.
The horn inconsistently shuts off and on.

What am I missing?
All additional wires are 14 AWG. Relay's are brand new and, yes, I've tried a few of them.
Is the ECU asking for a certain ohm?

[Speeddog]

Which Monster are you installing it on?

[Brainless]

Sorry...

It's a 2016 1200S

[Speeddog]

The stock horn wiring and switch can't handle one of those horns without a relay with dedicated supply wiring.

So when you tried it with the relay setup, what happened?

[Brainless]

So when you tried it with the relay setup, what happened?

The relay opens and closes (clicks on and off) at a regulated pace (approx 1 second intervals) while I have the horn button pressed. I've tried this with and without the horn hooked up. The fuse (20Amp) does NOT blow. Voltage being fed to the relay at the passive side is 11.83V with a fully charged battery and motor NOT running. I've tried both relay that came with the air horn and a Panasonic Micro Relay. Both behave the same. From what I understand, they both draw a minute amount of current.

I'm stomped...

[Speeddog]

WTAF 

That's nutty. I'll look at some documentation, see if there's some sort of explanation.

[stopintime]

Is that a turn signal relay? 

[Speeddog]

Well, it's not the dumbest thing I've ever seen, but it's the dumbest thing I've seen today, and I've been on Twitter already so that pretty well sums it up.

The horn wiring, and the wiring from the left handlebar horn button, all go directly into the instrument cluster.
One horn wire splits off to the optional alarm too.

I have some 'Sparky' skills, but I'm by no means an expert, so *absolutely* run the following advice past a real 'Sparky' to improve your chances of not releasing magic smoke.

You may be able to add resistors (in series or parallel) to make the relay coil resistance close to the horn resistance.
This *may* leave enough current for the relay to operate properly.

A more complex but likely safer path would be to leave the OEM horn on, and tap off it's wires to trigger a MOSFET transistor to drive the relay coil.

This whole deal is proof that just because a thing is possible, doesn't necessarily mean it's a good idea.
I'm looking straight towards Bologna while I'm typing that.

[Brainless]

Well, it's not the dumbest thing I've ever seen, but it's the dumbest thing I've seen today, and I've been on Twitter already so that pretty well sums it up.

The horn wiring, and the wiring from the left handlebar horn button, all go directly into the instrument cluster.
One horn wire splits off to the optional alarm too.

I have some 'Sparky' skills, but I'm by no means an expert, so *absolutely* run the following advice past a real 'Sparky' to improve your chances of not releasing magic smoke.

You may be able to add resistors (in series or parallel) to make the relay coil resistance close to the horn resistance.
This *may* leave enough current for the relay to operate properly.

A more complex but likely safer path would be to leave the OEM horn on, and tap off it's wires to trigger a MOSFET transistor to drive the relay coil.

This whole deal is proof that just because a thing is possible, doesn't necessarily mean it's a good idea.
I'm looking straight towards Bologna while I'm typing that.

OK, so the relay in parallel sounds like another way to do it. I don't know why I hadn't thought about that. As for the resistance, I thought about that. Just didn't have the right resistor. I did put a random one and the relay didn't even click. I even tried a small LED. 

Totally appreciate the feedback. It gave me some ideas. 

Is that a turn signal relay? 

Lol! Might as well be... 

[Howie]

Can you show us a wiring diagram of exactly what you did?

Is that a turn signal relay?