K11 Owners Group

will3hawks

Looking to install a secondary fan switch on my 94 K1100RS. What parts are needed? where do you wire in? where is that located? what guage wire is needed? relays? type of switch?

Any help and or photos would be most appreciated as well as the usual death threats and offers to deposit money for Nigerian Princes and lonely widows.

Regards,

Will
_________________
The truth is 100 miles east of Memphis
BMWMOA# 70125
94 K 1100RS (Speedwagon)
"Even if I should die on the road, this would be the will of heaven"
Matsuo Basho, 1644-1694

chopper_harris · Posted: Sun Jun 01, 2008 1:34 pm Post subject:

The relevant wiring is :

Fan Relay
Green/Brown - Live feed from Fuse 7
Blue/Yellow - Signal from Motronic Unit
Violet/Yellow - Output to Fan Motor

Fan Motor
Violet/Yellow - Input from Fan Relay
Brown - Frame Earth

So, you need to trace the Violet/Yellow to a convenient point between the relay and the motor. In practice, that will be just before the connector, which is cable tied on the frame on the LHS under the tank. Crying or Very sad

A relay rated at 10 amp will be fine, and any choice of switch in a convenient location. This depends on what is in your electronics biscuit tin, or how much you want to spend on OEM switches.

The relay load input/output should use cable of AWG 20-21 or heavier.

The switch side of the relay will draw a few mA, cable of AWG 30 will be fine.
_________________
C1 200 (2001)
R100 RS (1990)
NSU Quickly N (1964)
Honda 400/4 F1 (1977)
MotoGuzzi 1000C (1978)
Suzuki TL 1000 R (1999)
Kawasaki KLV1000 (2005)
K12R Sport (2007) - Wifeys

Flying Duck · Posted: Sun Jun 01, 2008 1:46 pm Post subject:

I used a 6 ohm load resistor because I had some around for doing LED lighting. I'd use something with less resistance if I were to do it again to make the fan go a little faster in "half" mode.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

SugarHillCTD · Posted: Sat Apr 04, 2009 4:28 pm Post subject:

Had to revive this thread to ask about the manual fan switch wiring.

Since I now have the bike sufficiently apart to address leak control, I wanted to wire in the switch. I can SEE the "violet/yellow" wire where it comes up from the fan but no way am I going to be able to get to it.

Is there an easier way to get to it inside the relay box?

Thanks for any help.
_________________
John & Cathy

'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F.

Jim · Posted: Sat Apr 04, 2009 4:42 pm Post subject: fan and fan switch modification

Drake or Larry - can one of you take a few minutes to draw a schematic for the resistor and the fan switch? I can't remember who originally posted the mod for the half speed and fan switch - it would be nice to have it done up right and put in one of the tech stickies.

I'm going to install a 3 core radiator (per Larry's install instructions) and a half speed resistor before I head off for the hot desert sands this summer.

Drake, with this mod, does the fan run at half speed when you flip the switch? Then it goes to full speed on the temp sensor if it ever gets that hot?

Thanks, guys.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Flying Duck · Posted: Sat Apr 04, 2009 6:35 pm Post subject:

Quick and dirty drawing. So quick that I should've labeled the load resistor 4 ohm, not 4 amp. Doh! The thing in the middle is of course a relay.

Load resistors generate heat. I used hose clamps to mount it up on the frame right behind the steering head on one of the diagonal members in front of the tank. That way it can dissipate some heat to the frame and there's also air blowing by it.

Yes, when the Moronic wants to turn the fan on it goes to full speed even if my circuit is turned on. The electrons have a choice of taking the route through the normal wiring or through the load resistor. Electrons are lazy and will always take the path of least resistance.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Flying Duck · Posted: Sat Apr 04, 2009 6:39 pm Post subject:

load resistors look like this:

or like this:

Not like this:

_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Jim · Posted: Sat Apr 04, 2009 7:20 pm Post subject:

Thanks, Drake. I should probably copy that to a sticky in the tech section at some point.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Flying Duck · Posted: Sat Apr 04, 2009 7:27 pm Post subject:

I updated my high-tech schematic - it now says 4 watt load resistor.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Jim · Posted: Sat Apr 04, 2009 7:44 pm Post subject:

well... crap! Is it supposed to be 4 ohm? or 4 watt??? or what?
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Flying Duck · Posted: Sat Apr 04, 2009 9:50 pm Post subject:

Boy, am I a dipshit today. It's 4 ohms.

I spent the whole day diagnosing the wrong thing on my project K75 which has had me a bit distracted. The bike was idling at 2000 rpm after I put the air box above the TBs back on after installing a cruise control cable. Could not for the life of me figure out WTF was wrong. It kept flooding too when I tried to start it so I'd have to pull the plugs and wait for the cylinders to dry out.

Tried EVERYTHING. Swapped injectors, FI computers, replaced the crankcase breather hose, checked everything for air leaks. It just kept running better - and faster. Finally thought I'd swap in another TPS even though I didn't think that was the problem. When I was playing with the TPS I noticed there isn't much play beyond the closed position. At 5:30 I finally figured out that what I'd done was that I unknowingly pushed the top of the TPS back when cramming the air box back in - this kept the throttle from closing all of the way.GRRRR!!!! Evil or Very Mad

So then I got the idle adjusted properly and reinstalled the TPS. Purring like a kitten now. Very Happy

_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Gary Bennett · Posted: Sun Apr 05, 2009 3:47 am Post subject:

Jim · Posted: Tue Apr 07, 2009 11:19 pm Post subject:

Gary - I'm sure you posted it somewhere - which fan switch did you use? I guess your fan switch runs the fan at full speed?

I kind of like the idea of being able to run the fan at half speed - if that will keep the bike from having to run the fan. I'm installing a 3 core radiator - figured that and running the fan at half speed would do the trick.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Flying Duck · Posted: Wed Apr 08, 2009 1:29 am Post subject:

Gary Bennett · Posted: Wed Apr 08, 2009 7:55 am Post subject:

If it is not too hot where you live, you might get away with it, but where I live it wasn't enough. I had the three core radiator and the half speed fan and I was changing the resistors often to make the fan run faster as it couldn't keep up with the cooling. I then ditched the resistors and fitted the thermo switch and my cooling problems were solved.
So, 3 core radiator and thermo switch is the answer to everyones questions.
_________________
Gary
'94 K1100RS

Jim · Posted: Wed Apr 08, 2009 8:52 am Post subject:

Gary Bennett · Posted: Thu Apr 09, 2009 6:49 am Post subject:

Jim,

The manual override switch is an Autoswitch from Cycle Gadgets, using the blinker cancel switch. This switch runs the fan at full speed now.
The Thermo Switch is a Davies Craig, the cheapest one.
_________________
Gary
'94 K1100RS

max · Posted: Sat Apr 11, 2009 4:38 am Post subject:

I think i was the first one to suggest the ballast resistor (to some derision, I I remember right Sad

).

The original is still running here on the RS, continually without any switches. Easiest way was to wire it ACROSS the two output terminals of the fan relay in the electronics box - one is is +12v (only on ignition on) and one is the fan motor +ve... the motronic can still fire the relay and put the motor on at full +12v, otherwise it's on at less than 12v thru the ballast.

If you want to add a switch (thermostatic or manual) just put it into one of the leads of the ballast... other thought would be to do a disconnectable insultated plug in the lead and have it on for summer, off for winter

Also, make sure the ballast is against something as a heatsink as otherwise it'll get so hot as to be a hazard to any nearby plastics - I've got mine attached to a frame rail under the seat with metal hose clips and plenty of thermal grease (heatsink grease like used for computer CPU chips).

Max

SugarHillCTD · Posted: Sat Apr 18, 2009 6:01 pm Post subject:

DONE

And nearly all of it is neatly tucked into the relay box. Hardest part was mounting the switch next to the ignition key and finding a switched 12v source.

but it is finally done.

Thanks for all who contributed input.
_________________
John & Cathy

'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F.

Stoked Steve · Posted: Sat Apr 18, 2009 8:03 pm Post subject:

Details, details, do tell, and a photo or two of the new switch arrangement would be nice.
_________________
Steve
Virginia Beach, VA
93 K1100RS Mystic Red SOLD
12 Suzuki DL650A VStrom