Adding A Manual Fan Switch to a 4 Valve K Bike

[Filmcamera]

I get no reading between pins 30 and 87 on either of the two relays, in fact no reading between any of the pins except 85 and 86.

The tops of them have nothing on them so I haven't posted a picture.

The only OEM relays in there seem to be, 61 31 1 459 676    SAFETY RELAY ABS, which is the big dark blue one on the top LHS and 61 31 1 459 677    RELAY - SCHLIEßER which is the black one to the right of it.

The other five, three yellow and two blue, are the type shown in the photos from an earlier post

[Inge K.]

I get no reading between pins 30 and 87 on either of the two relays, in fact no reading between any of the pins except 85 and 86.

Then your blue and yellow all is NO relays, which it also should be.

Where you have a black OEM relay which ends on 677 (NO) it normaly should be a blue OEM relay which
ends on 675 (NC)......but if the ABS is disconnected/not active, that doesn't matter.

[Filmcamera]

Ok so I will have to actually change the way the fan is wired for it not to be on all the time.  Though at this point I am tempted to use the now empty ABS switch and just wire it in as a manual on/off switch.

[piptravels]

Some people like to add a manual fan switch to their K bikes to help keep the bike's operating temperature down on hot days.  Adding a fan switch is really quite simple. The Motronic control unit triggers fan operation by grounding a blue/yellow wire that triggers the fan relay.  If you tap into that blue/yellow wire and have the switch ground that wire then the fan will come on.

Does this apply to a 1996 K110LT? I just got one and did my first 1,400+ mile trip and the manual switch looks like it might
be essential here in Southern California

[johnny]

greetings...

in socal i would be thinking of a johnny blanket... and of course go ahead and wire in that fan switch on your eleven hundert lt...

welcome to motobrick.com...

j o

[Laitch]

Some people like to add a manual fan switch to their K bikes to help keep the bike's operating temperature down on hot days.  Adding a fan switch is really quite simple. The Motronic control unit triggers fan operation by grounding a blue/yellow wire that triggers the fan relay.  If you tap into that blue/yellow wire and have the switch ground that wire then the fan will come on.

Does this apply to a 1996 K110LT? I just got one and did my first 1,400+ mile trip and the manual switch looks like it might
be essential here in Southern California

The title of the thread is Adding a Manual Fan Switch to a 4 Valve K Bike. Are you aware that your K1100LT is a 4V K bike? It is, so this thread applies to your bike.

Austin, Texas isn't in Southern California. Are you commuting and store a bike there to ride when you're out there? K-bike do not store very well without certain precautions being taken.

[piptravels]

I just rode from Austin to the high desert in southern California. I was not aware the K1100LT was a 4v K bike. But I am now, thanks. Not much on knowing every little detail...I just like to ride and fix things as they come up

[Laitch]

I just rode from Austin to the high desert in southern California. I was not aware the K1100LT was a 4v K bike. But I am now, thanks. Not much on knowing every little detail...

Knowing whether your K is 2V or 4V isn't a little detail. Fix things as they come up must mean put air in the tires.

How about posting a few photos of your bike?

[piptravels]

Some people like to add a manual fan switch to their K bikes to help keep the bike's operating temperature down on hot days.  Adding a fan switch is really quite simple. The Motronic control unit triggers fan operation by grounding a blue/yellow wire that triggers the fan relay.  If you tap into that blue/yellow wire and have the switch ground that wire then the fan will come on.

Pardon my ignorance Frankenduck, so I would be switching the blue/yellow wire on the wiring harness to the green ground wire and this should give me the manual fan switch functionality?

[piptravels]

greetings...

in socal i would be thinking of a johnny blanket... and of course go ahead and wire in that fan switch on your eleven hundert lt...

welcome to motobrick.com...

j o

Hey Johnny, Thanks for the welcome. I switched the blue/yellow wire and the green/black (frame ground) and the fan comes on when the ignition is turned on but the engine is off. When I start the bike the switch no longer turns on the fan-defeating the purpose for me. Should I be using the smaller solid green wire instead?

[Inge K.]

I switched the blue/yellow wire and the green/black (frame ground)

Green/black is switched power........connect the blue/yellow to a frame ground, battery negative
or a Brown wire (which is frame ground) with the switch in between.

[piptravels]

Green/black is switched power........connect the blue/yellow to a frame ground, battery negative
or a Brown wire (which is frame ground) with the switch in between.

Thank you so much! I was under the impression that Green/black was a frame ground-live and learn. Will tap brown and report back :2thumbup:

[The Mighty Gryphon]

Easy way to remember.

Ground is also called "earth".  The earth is made of dirt, and dirt is often brown.