Horn Relay? - K-Bikes.com - Excellence in Motion
 
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post #1 of 5 (permalink) Old Jun 30th, 2013, 10:16 am Thread Starter
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Horn Relay?

Replacing my stock, sickly bumblebee horn with a Hi/Lo pair of Bosch's. Not the loudest out there but waaaay better than stock. I got the horns used. They had previously been on a K bike, had the stock brown/green pair soldered into their wiring.
Question is:
Should I install a relay or just use the existing harnessing and power?
I had a nautilus on my last bike wired through a relay, but it has a huge current draw. These maybe not so bad.
Consensus?
Thanks...
...bob...
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post #2 of 5 (permalink) Old Jun 30th, 2013, 10:54 am
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Quote:
Originally Posted by haileymon
Replacing my stock, sickly bumblebee horn with a Hi/Lo pair of Bosch's. Not the loudest out there but waaaay better than stock. I got the horns used. They had previously been on a K bike, had the stock brown/green pair soldered into their wiring.
Question is:
Should I install a relay or just use the existing harnessing and power?
I had a nautilus on my last bike wired through a relay, but it has a huge current draw. These maybe not so bad.
Consensus?
Thanks...
...bob...
You do NOT say what model-year you have.

If you have a last generation K1200RS (2003-2004) or K1200GT (2003-2005), then you should have 8 fuses per fuse-box (16 slots total). In this case, the Horn and optional Alarm-System are on the same fuse. So the fuse might take the additional watts needed, but the wires (to the horn) may not.

BUT, If you have an earlier model K1200RS (1998-2002), then you should have 4 fuses per fuse-box (8 slots total). In this case, the Horn and the Radiator-fans share the same 15 amps fuse, so the fuse might NOT take the additional watts needed when the fans are running.

Given the bad habits of the BMW design to use the minimal wire size for everything, I would say it is always safer to use a relay WHEN IN DOUBT...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
John (Montreal, CANADA)
K1200RS (2002 IceBlue/Red - 96,000 miles)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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post #3 of 5 (permalink) Old Jun 30th, 2013, 8:45 pm
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There should already be a horn relay on your bike. Up to specs for a larger horn or two, that I don't know.

In any case my bike is double relayed if just to bypass most of the too small BMW wiring.Better voltage at the horn connections also, gained 0.73V.

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post #4 of 5 (permalink) Old Jun 30th, 2013, 10:06 pm Thread Starter
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Horn Relay

Thanks for the input, folks. I don't know the current draw of the new horns. I will delve into the wiring diagram to check on the possibly existing relay. I will most likely be installing a relay just to get more AWG to the horns.


btw...Its a 2001 in Hello Officer Red.
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post #5 of 5 (permalink) Old Jul 1st, 2013, 5:39 am
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There is a horn relay but the wires from it to their wimpy horns are pretty thin and can corrode.

For bigger horns it might be easier to fit an additional relay close to where the horns are being mounted to use short power wires, then use one the existing horn wires to trip the new relay.

To avoid using the oem ground and horn wires, run in a new pair of ground and power from the battery terminals (12-14 AWG?)

If you do that first and fit an inline fuse at the batter, you then have a good power pickup point in the cockpit for other addons.



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