cooling fans blow fuse - BMW Luxury Touring Community
 
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post #1 of 13 Old Sep 20th, 2008, 3:03 pm Thread Starter
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cooling fans blow fuse

My 2003 K1200RS blows the fuse for cooling fans and horn immediately. Haven't ridden it all summer as the LT has had my interest but took it out this morning and noticed the horn didn't work, then temp gauge started climbing in slow traffic. The RS usually runs hotter than the LT but I could tell the fans weren't on.

Pulled over and had a small amount of coolant over flow. It cooled down quickly and I was able to get it back to the barn at near highway speeds so over heating was not an issue.

My question is where do I start? It appears to be a short somewhere. Fans spin freely, one horn is loose at the mounting.

Redrider
2000 K1200LT
2003 K1200RS


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post #2 of 13 Old Sep 20th, 2008, 5:53 pm
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Re: cooling fans blow fuse

I looked at my diagrams but I show F3 15A for the horns and F9 10A for the fans. This was for a 2003 K1200RS. So I am not sure what is going on.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
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post #3 of 13 Old Sep 21st, 2008, 6:40 pm Thread Starter
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Re: cooling fans blow fuse

Saw a similar configuration in the Clymers. My fuse boxes look like the 2002 and earlier, title says 2003. Probably a very early run 2003.

Redrider
2000 K1200LT
2003 K1200RS


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post #4 of 13 Old Sep 21st, 2008, 11:45 pm
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Re: cooling fans blow fuse

Are you known to have varmints like mice or rats where you store it? Could be something got in there and nibbled on the wires while stored.

David Taylor
San Jose, CA
2010 R1200RT Polar Metallic
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post #5 of 13 Old Sep 22nd, 2008, 9:42 am
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Re: cooling fans blow fuse

Does it blow the fuse immediately or after it gets warm? If one of your fans seized it could short circuit and therefore blow the fuse. At least thats what happened to mine.

Andreas Pleschutznig
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post #6 of 13 Old Sep 22nd, 2008, 11:07 am
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Re: cooling fans blow fuse

Both of my factory diagrams RS 2001-2003 and 2003-2006 show the same thing, two different fuses for the horn and fans

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #7 of 13 Old Sep 22nd, 2008, 11:17 am
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Re: cooling fans blow fuse

Following up on Andy's response... Like you said, F3 is the fuse for the horn and the fans - it also supplies voltage to the anti-theft alarm connector. If the fuse blows immediately and you do not have an alarm installed, then you may have a problem with a short in the wiring harness. If you have an alarm, disconnect the module (6-pin connector to a small module under the seat) and see if the fuse still blows immediately. If it doesn't blow after you unplug the alarm module then the module has failed.

The horns and the cooling fans are isolated from this fuse by relays - any short in the horn circuit would blow the fuse only after you press the horn button. Similarly any short in the fan wiring circuit would only show after the engine was hot enough to demand fan operation by closing the fan relay.

If the fuse is not blowing immediately after you install it, honk the horn. If it works and doesn't blow the fuse, you have a short downstream of the fan relay, probably a shorted fan motor. A shorted fan on an RS is not altogether uncommon.

Randy Prade
Aurora, CO

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post #8 of 13 Old Sep 22nd, 2008, 10:11 pm
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Re: cooling fans blow fuse

I had a seized fan right after buying the bike.... I never lost my horn, but the fuse didn't blow until the fans "kicked" on....

Maybe I never checked the horn after blowing the fuses... who knows!!

'10 1200 GSA -- Banana!!
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post #9 of 13 Old Sep 22nd, 2008, 10:45 pm
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Re: cooling fans blow fuse

Quote:
Originally Posted by michman
I had a seized fan right after buying the bike.... I never lost my horn, but the fuse didn't blow until the fans "kicked" on....

Maybe I never checked the horn after blowing the fuses... who knows!!
The LT fans don't share a fuse with the horn. The OP was talking about an RS, which does.

Randy Prade
Aurora, CO

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post #10 of 13 Old Sep 23rd, 2008, 9:41 am
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Re: cooling fans blow fuse

OK, I found the correct set of diagrams that show the shared fuse. Looks like it also feeds the optional alarm as well so try that if the other circuits check out OK.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #11 of 13 Old Sep 25th, 2008, 2:47 pm Thread Starter
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Re: cooling fans blow fuse

Both fans spin freely and the fuse blows immediately, as soon as the key is turned on. There is no visible damage to what I can see of the wiring harness but have not removed the plastic yet. I do not have an alarm on this bike.

There are two horns, I think add on or after market. One is on the left side, is loose and appears to have some corrosion on one of the terminals. Hope that is it. I plan on getting the plastic off soon and report back.

Thanks to all.
Mike

Redrider
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2003 K1200RS


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post #12 of 13 Old Oct 2nd, 2008, 2:20 pm Thread Starter
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Re: cooling fans blow fuse

And the solution was:
A short in the horn wire. The horn had become slightly loose from the mounting bracket and because of that the wire treminal was touching the bracket and had worn through the insulation thus shorting the circuit immediately when the ignition was turned on. The horn didn't work and the fans had no chance to come on.

Occam's Razor-try the simple things first

Redrider
2000 K1200LT
2003 K1200RS


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post #13 of 13 Old Oct 2nd, 2008, 3:35 pm
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Re: cooling fans blow fuse

Good find!!!!!

Mike Trevelino
Williamsburg, VA
2008 RT - Sold December 2019
2000 LT - Totaled at 99,960 miles


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