Mystery Switch?

[Laitch]

Well then, I don't understand rbm's take on this, but I wish I could. I'll sleep on it.

[rbm]

That makes sense to me, Tim. What I'm not understanding is how the connection made by the switch would differ from the connection made by adding the loop in the plug.

The high altitude plug connects to a totally different set of pins on the ECU (Pin 11) than does the TPS (Pin 2&3).  When you short the pins in the high altitude plug, you're not overriding the TPS, you're telling the ECU through Pin 11 to go into a "fuel enleanment" mode .  When this Yeeehaaa switch is engaged, it tells the ECU through Pin 3 to go into "accelerator pump" mode and enrichen the fuel.  That's why this mod doesn't do what it's intended to do.

[Inge K.]

It exists two different versions of the high altitude plug wiring.
1. Connects 12V+ to pin 3 (shorts the WOT contact in the TPS).
2. Connects 12V+ to pin 11.

[Bill]

It exists two different versions of the high altitude plug wiring.
1. Connects 12V+ to pin 3 (shorts the WOT contact in the TPS).
2. Connects 12V+ to pin 11.

Is one method better than the other,  is there a model year with the change, is there a program change in the ECU related to the change ?

[Farmrjohn]

The mystery switch is indeed wired to the altitude correction plug.  The rocker switch has three wires, black, grey, and white from top to bottom that go into a sleeve.  Sometime in the past the black and grew wires were connected to the male portion of the altitude plug, which looks like it has two black wires.  The free end of the white wire remains in the sleeve.  It looks like I've answered my question on which position is "on", which would be up.  While I'm not happy with the connectors used, I think I'll keep it active in case I ride to elevation over 4000' or so.  The discussion on which pins are connected is interesting.  My understanding of the altitude correction plug is that when inserted it interacts with a pin otherwise not used, changing the amount of fuel.  I would assume it would lower the fuel with higher altitude, just as changing to a smaller jet in a carb would do.

[Inge K.]

Is one method better than the other,  is there a model year with the change, is there a program change in the ECU related to the change ?

1. No idea, but 12V+ to pin 11 is mostly used.
2. Have only the dates on the different wiring diagram.....very early model pin 11, then ~ a couple of years
    with 12V+ to pin 3, then return to pin 11 metod.
3. AFAIK it haven't been any change on the ECU's.