P200e: no turn signals, brake light, or horn
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Lurker
1979 Vespa P200e
Joined: 01 Apr 2021
Posts: 2
Location: Alaska
Tue Apr 13, 2021 11:14 am quote
1979 model, I believe that it has the late 1979+ electrics. Keyed ignition and good battery that tests at 12v+

The taillight illuminates with the key in the on position. The headlight illuminates with the engine running. The horn works when connected directly to a 12v source. The horn circuit has continuity as tested with a multimeter when the horn button is depressed. Iíve found the wiring diagram online but Iím an amateur with electrics requiring cookbook instructions to complete a task.

Do the ignition and run switches need to be on to operate horn, brake, and blinker? From what Iíve read, they all operate off the battery and donít require the engine to be running to operate.

Iíd love some guidance on where to go from here in diagnosing and fixing the non-operable brake light, turn signal, and horn.
Member
66 bluebadge,primavera,2x 74 rally,79 p200e 64 gl 2x 64 vbb 2x ld 57 ld 125
Joined: 08 Dec 2014
Posts: 37

Tue Apr 13, 2021 11:27 am quote
I would pull the spare tire off, and check the fuse(white plastic cylinder with wires coming out either end) and while your there check all the connections at the regulator,turn signal relay, etc. It wouldn't hurt to pay attention to the wire colors and where they come from and where they go. it will pay off later tracking down future faults. Good luck, and keep us posted on results/problems, the people on here are a font of knowledge!
Molto Verboso
2007 Stella 225
Joined: 02 Nov 2019
Posts: 1678
Location: Rochester, Minnesota
Tue Apr 13, 2021 2:26 pm quote
What wiring diagram are you using for reference?

Is this after 1979 correct for your scooter?

https://www.scooterhelp.com/electrics/pages/VSX1T.p200.html#euro_after


Using you digital multimeter

What voltage do you have on the horn, no buttons pressed. Key in on or run position?

+ on meter to white wire on horn
- on meter to a ground or scooter chassis.

What voltage do you have on the 1 terminal of the ignition switch, no buttons pressed. Key in on or run position?

+ on meter to white wire terminal 1
- on meter to a ground or scooter chassis.


If those readings are not battery voltage, I would pull the wires from terminal one and connect them to a 12 volt battery and see if they work.
Addicted
1981 P200E / 1979 P200E / 1974 Rally 200
Joined: 30 Jul 2009
Posts: 583
Location: San Francisco, CA
Tue Apr 13, 2021 7:56 pm quote
jedihunter wrote:
I would pull the spare tire off, and check the fuse(white plastic cylinder with wires coming out either end) and while your there check all the connections at the regulator,turn signal relay, etc. It wouldn't hurt to pay attention to the wire colors and where they come from and where they go. it will pay off later tracking down future faults. Good luck, and keep us posted on results/problems, the people on here are a font of knowledge!
Second this. It sounds like the fuse.

Those plastic fuse holders get corroded, so might even be the connections, if the fuse is ok.
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