Modern Vespa : Headlight and horn issue.

Headlight and horn issue.

Nelluch125

UTC

details

Hooked

1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce

Joined: UTC
Posts: 467
Location: St. Catharines, Ontario

Nelluch125

Hooked

1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce

Joined: UTC
Posts: 467
Location: St. Catharines, Ontario

UTC quote

So I have px125e.
Swapped in a p200 engine.

All lights work minus the headlight (top bulb) and the horn.

When I start flipping switches, the bottom light turns off and the large bulb lights up bit only when i rev the throttle. It's nothing noteworthy but it does light up a tad.

The horn gives me nothing. It's dead.

Any idea what I could be?

Could it be the bulb?
Do I need a new horn?
Could it be the rectifier?

Any tests I can do to narrow it down?

The battery is brand new.

Thank you.

N

garncarz UTC details Molto Verboso 1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1955 BMW R50 Joined: UTC Posts: 1206 Location: Lakes Region of Maine
garncarz Molto Verboso 1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1955 BMW R50 Joined: UTC Posts: 1206 Location: Lakes Region of Maine	UTC quote https://www.scooterhelp.com/electrics/pages/VNX2T.px125e.html https://www.scooterhelp.com/electrics/pages/VSX1T.p200.html

OP Nelluch125 UTC details Hooked 1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce Joined: UTC Posts: 467 Location: St. Catharines, Ontario
OP Nelluch125 Hooked 1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce Joined: UTC Posts: 467 Location: St. Catharines, Ontario	UTC quote garncarz wrote: https://www.scooterhelp.com/electrics/pages/VNX2T.px125e.html https://www.scooterhelp.com/electrics/pages/VSX1T.p200.html Grounds are good. Switches intact.

chandlerman UTC details Innovator 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 66 Lammy S3, 63 Lammy S3 Riverside Joined: UTC Posts: 12999 Location: Nashville 301 Days Since Last Explosion
chandlerman Innovator 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 66 Lammy S3, 63 Lammy S3 Riverside Joined: UTC Posts: 12999 Location: Nashville 301 Days Since Last Explosion	UTC quote Isn't it a split AC/DC system? Sounds like something is crossing over between the DC (pilot light/turn signals/brake light) and AC (headlight/tail light) sides of the electrical system, maybe.

OP Nelluch125 UTC details Hooked 1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce Joined: UTC Posts: 467 Location: St. Catharines, Ontario
OP Nelluch125 Hooked 1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce Joined: UTC Posts: 467 Location: St. Catharines, Ontario	UTC quote I have no idea. Electrical issues elude me. I am honestly at a loss. Hence why I'm here asking. I'm hopeful someone has experienced this and solved it.

sdjohn UTC details Johnny Two Tone '15 GTS300, '86 PX125EFL, '66 VBB, '01 ET4 Joined: UTC Posts: 9063 Location: San Diego, CA
sdjohn Johnny Two Tone '15 GTS300, '86 PX125EFL, '66 VBB, '01 ET4 Joined: UTC Posts: 9063 Location: San Diego, CA	UTC quote yeah headlight and horn are on the ac side of things

OP Nelluch125 UTC details Hooked 1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce Joined: UTC Posts: 467 Location: St. Catharines, Ontario
OP Nelluch125 Hooked 1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce Joined: UTC Posts: 467 Location: St. Catharines, Ontario	UTC quote sdjohn wrote: yeah headlight and horn are on the ac side of things Ok. So what does that mean in respect to diagnosing or resolving my issue?

sp949 UTC details Hooked PX150E Joined: UTC Posts: 297 Location: Modesto, California, USA
sp949 Hooked PX150E Joined: UTC Posts: 297 Location: Modesto, California, USA	UTC quote When you swapped to the P200 engine, did you transfer the stator from your 125E to the 200? I am pretty sure you need that stator for everything to work properly as before. The battery powers the horn, brake light, neutral light, and tail light (if your ignition switch has a parking position).

garncarz UTC details Molto Verboso 1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1955 BMW R50 Joined: UTC Posts: 1206 Location: Lakes Region of Maine
garncarz Molto Verboso 1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1955 BMW R50 Joined: UTC Posts: 1206 Location: Lakes Region of Maine	UTC quote sp949 wrote: When you swapped to the P200 engine, did you transfer the stator from your 125E to the 200? I am pretty sure you need that stator for everything to work properly as before. The battery powers the horn, brake light, neutral light, and tail light (if your ignition switch has a parking position).

Nelluch125

UTC

details

Hooked

1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce

Joined: UTC
Posts: 467
Location: St. Catharines, Ontario

Nelluch125

Hooked

1981 Vespa P200e, 1985 Vespa PX125e, 1985 T5, 1971 Sprint Veloce

Joined: UTC
Posts: 467
Location: St. Catharines, Ontario

UTC quote

sp949 wrote:

When you swapped to the P200 engine, did you transfer the stator from your 125E to the 200? I am pretty sure you need that stator for everything to work properly as before. The battery powers the horn, brake light, neutral light, and tail light (if your ignition switch has a parking position).

I installed the stator that came with the p2.
Everything works. Minus the horn and tip headlight bulb.

spacecat UTC details Hooked Vespa Primavera 1974 Joined: UTC Posts: 225 Location: Nebraska USA
spacecat Hooked Vespa Primavera 1974 Joined: UTC Posts: 225 Location: Nebraska USA	UTC quote Take these two items out and test them separately. They may both have failed or they may have different causes of failure.

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