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Beemer01
04-22-2007, 07:32 PM
Next to the fuse box on my 85 K100RS, there is a toggle switch which looks like it should be there. Doesn't seem to do anything... anyone have any idea on what this could be for?
barryg
04-22-2007, 09:03 PM
This is a guessing game, ok my guess is an updated high altitude switch.
jdiaz
04-23-2007, 07:24 AM
Could be remnants of an alarm system.
breyfogle
04-23-2007, 05:59 PM
Didn't come from the factory that way....
MplsK100RT
04-23-2007, 08:52 PM
Could be remnants of an alarm system.

aftermarket alarm?
Beemer01
11-08-2007, 02:40 PM
Since the PO, installed the Switch in lieu of the jumper, I'm guessing that the flat frozen plains would require an open circuit - switch turned off and the lofty highlands would require a closed circuit - switch turned on? Trouble is the way it has been installed makes it hard for me to determine which is which, if you catch my drift.

Any easy way to tell or do I have to disassemble it and test with a battery?:type
cayuse60
11-08-2007, 03:11 PM
Since the PO, installed the Switch in lieu of the jumper, I'm guessing that the flat frozen plains would require an open circuit - switch turned off and the lofty highlands would require a closed circuit - switch turned on? Trouble is the way it has been installed makes it hard for me to determine which is which, if you catch my drift.

Any easy way to tell or do I have to disassemble it and test with a battery?:type


With the engine warm actuate the switch. Closed circuit will reduce fuel mixture, open circuit will enrich. RPM should decrease with circuit closed and increase with circuit open on a properly balanced and tuned engine.
wmubrown
11-09-2007, 09:04 AM
This is a guessing game, ok my guess is an updated high altitude switch.

+1 on this suggestion... it was a very common modification. Easy to check... typically the switch would be wired into the existing plug under the seat, on the left side, up near the rear of the gas tank. If that's where the wire leads go, that's likely what it is. PO might have cut the factory plug off and connected to the factory wires. I left the plug on mine and tapped into the wires so it would be obvious what the switch did.
wmubrown
11-09-2007, 09:07 AM
Since the PO, installed the Switch in lieu of the jumper, I'm guessing that the flat frozen plains would require an open circuit - switch turned off and the lofty highlands would require a closed circuit - switch turned on? Trouble is the way it has been installed makes it hard for me to determine which is which, if you catch my drift.

Any easy way to tell or do I have to disassemble it and test with a battery?:type

Correct - OFF for lowlands, ON for highlands. Typically - up is on, down is off. Testing a switch is very easy with an ohmmeter - put one probe on one switch lead, the other probe on the other lead. HIGH (infinite) impedance = OPEN switch (OFF) and LO (should read less than 100 ohms for sure) is CLOSED (ON).
jcridge
11-17-2007, 09:35 AM
The altitude plug when shorted decreases the injector duration, but how does it acheive that? Is it another complete map, < or> resistance to coolant and or air circuits? I haven't found information on this. It would be a way to increase MPG at low altitude, if it will not prove to be too lean. A variable pot could be installed in place to "tune" the EFI.

Thoughts, comments :stick

Cheers,

John