Neutral switch
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Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Mon Feb 27, 2017 5:29 pm quote
My 1980 100 neutral light won't work.
So far I tried to bypass the neutral switch by connecting the 2 wires that go to the switch together. Nothing happened. Next I plugged the wire from the high beam indicator into the neutral light and it went on. So the bulb is working.
Does this mean there's a short somewhere inside the Scooter?
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 06 PX150, 65 Li225 Silver Special, 86,95,96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3442
Location: Oceanside/ SF
Mon Feb 27, 2017 5:43 pm quote
It could be a wire integrity problem, but start with the easy stuff and check for corrosion at the bulb, bulb holder and bulb holder ground. If still nothing get a jumper wire and bypass the harness and see if the bulb will light up, that will tell you if the harness wire is bad. Then finally check the switch.

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Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Mon Feb 27, 2017 5:56 pm quote
Thanks, I got the bulb to light up by plugging the wire from the high beam indicator. So the bulb works.
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Mon Feb 27, 2017 6:25 pm quote
I bypassed wire going from switch to light, no good. So there is no power to the neutral switch. I see from the schematic that the power wire comes from near rear brake pedal so that's where I'll have to look next.
Addicted
Rally 180, li150, P125, p200, p200, p200
Joined: 13 May 2015
Posts: 646
Location: Va
Mon Feb 27, 2017 7:02 pm quote
Vpfalcon wrote:
I bypassed wire going from switch to light, no good. So there is no power to the neutral switch. I see from the schematic that the power wire comes from near rear brake pedal so that's where I'll have to look next.
Does that mean yo jumped the switch contacts? This would help rule out a bad switch.
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Tue Feb 28, 2017 4:23 pm quote
I cleaned the connection to the rear brake ( we're it gets power) connected the red to the yellow and voila! The light works.
Unfortunately I was a little rough on the neutral switch and snapped off a connector. So I have to buy one now.
Maybe it was bad anyway! I'm pretty sure it will work with a new switch.
Thanks for the schematic it really helped.
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 06 PX150, 65 Li225 Silver Special, 86,95,96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3442
Location: Oceanside/ SF
Tue Feb 28, 2017 4:40 pm quote
Good deal!
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Sat Mar 04, 2017 9:43 am quote
The switch works when not installed. Connected the two wires, manually press the plunger (button) and the light works. With the switch installed no light.
I took the cover off the shift mechanism (batwing?) the pin that presses the plunger is there. Hate to take that apart as the bike shifts well.
Is the shift mechanism for American Vespa different from European? Maybe it was replaced some years ago and it doesn't have the tab to engage the switch.
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Sat Mar 04, 2017 2:48 pm quote
The gear selector does not depress the plunger. I'm thinking if I adjusted the position of the selector it may start to work. First pic is 1st gear, second pic is neutral

image.jpeg

image.jpeg

Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Sun Mar 05, 2017 9:43 am quote
The switch I ordered which is labeled correct for my Scooter is "normally open". The switch required for 100 Vespa needs to be "normally closed". Wrong switch.(Max!)
The notch in gear selector should line up with the switch, (circuit closed). When in gear the plunger is depressed, (circuit open).
I was able to gerryrig the original switch to test.

IMG_0346.JPG

Hooked
P200e
Joined: 13 Feb 2017
Posts: 121
Location: Eureka, Ca
Mon Mar 06, 2017 8:36 pm quote
you really need to clean that scooter up. That's a mess.

Also, if you find the right switch let me know, I need one also
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Tue Mar 07, 2017 7:30 am quote
Thanks Gump,
I'll consider cleaning the motor up a bit. It's just oil and grease, it doesn't bother me much.
Sc**ter W**st has part they think will work on the smallies. #126899

IMG_0352.PNG

Hooked
Jet 200, P200E (x2), T5
Joined: 27 Jan 2013
Posts: 362
Location: Paris, France & L.A., Cal, USA
Wed Feb 27, 2019 5:02 am quote
So, did it work out?
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 522
Location: Oak Brook, Illinois
Thu Feb 28, 2019 4:33 am quote
Yes the part worked!
Hooked
Jet 200, P200E (x2), T5
Joined: 27 Jan 2013
Posts: 362
Location: Paris, France & L.A., Cal, USA
Thu Feb 28, 2019 3:33 pm quote
OK thanks!
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