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Old bike neutral switch, new harness.. (paging Brad Black)

Started by stopintime, April 21, 2013, 09:56:53 AM

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stopintime

April 21, 2013, 09:56:53 AM Last Edit: April 22, 2013, 04:17:24 PM by stopintime
So, my S2R800 got new old 750 cases with a different switch at the back of the cases.

What's the difference? Can they be modified to work with each other?

(Because it's not connected at the moment I have all sorts of issues: no green light, no start without pulling clutch and raising side stand)
252,000 km/seventeen years - loving it

ducpainter

#1
April 21, 2013, 10:10:06 AM
I think the old (750 type) switch was single wire and the new (800) is a two wire switch.

I'm not certain, but you should be able to connect the power wire to the switch, and the ground to the chassis.

That's what I'd try.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


stopintime

#2
April 21, 2013, 10:31:35 AM
Suggestions about how to establish which of the two harness wires I choose to connect the single positive 750 wire to? Try both and see which works? (I own a multimeter, but we're still strangers)
252,000 km/seventeen years - loving it

ducpainter

#3
April 21, 2013, 10:56:39 AM
Quote from: stopintime on April 21, 2013, 10:31:35 AM
Suggestions about how to establish which of the two harness wires I choose to connect the single positive 750 wire to? Try both and see which works? (I own a multimeter, but we're still strangers)
Set your multi meter to 12V and turn on the key. The wire that registers voltage would connect to the switch.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


stopintime

#4
April 21, 2013, 11:15:55 AM
Not so fast  :P

One red probe from the meter to the two-pin harness connector?
The other, black, from the meter to where?

The bike sends constant positive, through the plus/single wire, to the switch?
Switch breaks that positive to activate the green light?

???

As easy to hold a wire between the single wire and check which of the two harness connector pins make the light go green? Short circuit danger?
252,000 km/seventeen years - loving it

ducpainter

#5
April 21, 2013, 11:39:27 AM
Quote from: stopintime on April 21, 2013, 11:15:55 AM
Not so fast  :P

One red probe from the meter to the two-pin harness connector?
The other, black, from the meter to where?

The bike sends constant positive, through the plus/single wire, to the switch?
Switch breaks that positive to activate the green light?

???

As easy to hold a wire between the single wire and check which of the two harness connector pins make the light go green? Short circuit danger?
Sorry...

Red probe to the wire harness and the black to a chassis ground.

Switch makes the ground connection to complete the circuit. In this circuit the bulb prevents it form being a 'short circuit'.

The advantage to using the meter is it removes the possibility of short circuits and damage.

"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


stopintime

#6
April 21, 2013, 01:07:52 PM
So, with the bike in neutral, ignition on, I find the pin that makes the meter show a reading (the other pin won't show a reading) The wire going to that 'live' pin connects to the switch - the other to engine/chassis ground. Correct?

Will the green light be activated through the testing procedure?
252,000 km/seventeen years - loving it

ducpainter

#7
April 21, 2013, 03:07:41 PM
Quote from: stopintime on April 21, 2013, 01:07:52 PM
So, with the bike in neutral, ignition on, I find the pin that makes the meter show a reading (the other pin won't show a reading) The wire going to that 'live' pin connects to the switch - the other to engine/chassis ground. Correct?

Will the green light be activated through the testing procedure?
Correct...

unless the smoke gets out. ;D
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Gimpy

#8
April 21, 2013, 04:26:40 PM
Quote from: ducpainter on April 21, 2013, 03:07:41 PM
Correct...

unless the smoke gets out. ;D
[laugh]
too true

stopintime

#9
April 22, 2013, 03:16:22 PM
 [bang]  other way around - my 750 engine is the one with a dual wire switch and connector - my 800 harness has a single wire bullet connector.
252,000 km/seventeen years - loving it

Howie

#10
April 22, 2013, 03:50:06 PM
Not sure, but you should be able to use the switch from your 800.  I think the difference is the newer one grounds internaly to the case so a ground wire is not needed.

stopintime

#11
April 22, 2013, 04:05:17 PM
Quote from: howie on April 22, 2013, 03:50:06 PM
Not sure, but you should be able to use the switch from your 800.  I think the difference is the newer one grounds internaly to the case so a ground wire is not needed.

Don't know how it looks inside, but the hole for the 800 switch is deep (before you get to the threads) where the 750 is not. Either the case thicknesses are very different or the switches are.

Confuses me a little more - the parts catalogs for M750i, S2R800 and SS750 all show the same switch (two wires)
252,000 km/seventeen years - loving it

Howie

#12
April 22, 2013, 04:13:35 PM
The switch does need to be the correct length to work, which one would be the correct length for your now custom operation I don't know.  As I remember Ducati went to the single wire switch around 2001.  Too long can be spaced to work.

stopintime

#13
April 22, 2013, 04:19:52 PM
Another "don't know" - this donor engine had a 5 speed gear box, but now houses my 6 speed....
252,000 km/seventeen years - loving it

ducpainter

#14
April 22, 2013, 05:19:03 PM
If the switch is two wire then just ground one of the wires and feed voltage from your harness to the other and see.

The smoke shouldn't escape.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


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