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I'm hoping I can get some assistance. I have a 76 Vespa 90. Runs great. however I can't seem to get the headlight right. I have the wring diagram. (there is a lot of different diagrams) basically there is a dark green wire running from the switch on the headset to the headlight switch. That dark green wire gets its power from a light green wire. That light green wire I cannot find on my diagram. Also the headlight only seems to work with certain bulbs (all are 6volt of course) the high beam indicator light work. When I go to test the volts my meter says 0.00 but the indicator light is lit. I need help.

i have read other post regarding similar issue but none seem to mention this light green wire.
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bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
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Pics of the switch and the wiring inside of your headset would help.
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Ok here is 2 photos
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As you can see my stich terminals are color coated so it seems right. Also my reg only has 4 wires running into it. The diagram I have show 5.
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Can you take shots of the wiring out of the stator and into the reg? I can't find a 4 wire diagram either. What happens if you match up the key switch to this diagram?
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If I match it up to the diagram still no headlight.
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Forum member supplied image with no explanatory text
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What does the handlebar switch that controls the lights look like? What conditions are the wires in it? Your regulator wires match up with my 75 Primavera even though the diagram shows 5.
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There wasn't a switch. I purchased one off eBay. It's not the exact same. But close enough. There was only 4 wires ran. Hi/low beam and horn.
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Hmmm. Can you take a pic of the eBay switch as well as the metal contacts inside the switch?
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Here it is
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The wires seem decent ( some like by the reg are faded but all the others seem in fairly good condition considering the year.
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Hmm that switch matches up with the diagram. Taking a step back, you said the high beam on the bulb works. If you swap the purple wire at the bulb holder with the brown one does the low beam turn on? Where's the black wire on the bulb connect to?
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I was looking at my reg more closely and I do have a 5th wire it's the ground connected to the left mounting bolt.
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I have an old test light headlamp from a 6 volt qt50 (Yamaha moped) when I hook that bulb up the high beam it all works. (No lo beam the part is burnt) but I have a new 6v 35/35 that you see in the second photo it's dim hi beam indicator immediately goes out and low beam still is not working.
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So if you jiggle the brown wire from the switch to the bulb holder does it flicker brighter? If you get your meter and test for AC voltage at the light what do you get for high/ low?
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No no flicker no change. When I use my test bulb it's nice and bright along with the indicator light.

As for my volt meter sorry for my ignorance bit I can't figure out how to test Ac with this meter can you help me:)
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It's hard to read but one of the Vs is AC and one is DC. Usually V with a wavy mark next to it is AC and V with a straight line is DC. They are different so if the meters not adjusted for the right thing the readings are worthless.
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I'm not sure I have 2 settings but I've tried both and it doesn't read anything. Yet the hi beam indicator light is on.
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Turn the switch to 20 on the V with the straight line (measuring no more than 20V DC voltage) and then touch the probes to a good motorcycle battery or 9 volt smoke detector battery. Don't use the claw thing. What does the meter display? If it reads something close to what's printed on the battery then I would say your meter is probably ok and you can now select the 200 V with the curvy wave and now measure AC voltage on the high beam wire.

If the meter doesn't display anything when you measure DC with the batteries, I wouldn't trust it to measure AC and would toss it in the garbage.
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Use your battery as a tester.

Disconnect the fuse and hook a couple of test wires up to the + and - terminals. With the engine not running, run current directly to your new bulb, bypassing the switch.

Do both the hi and low beams work? If yes, put bulb in holder and do the same test.

If all is good, hook up the switch and run current from the test leads to the switch. What happens?
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[quote]Use your battery as a tester.

Disconnect the fuse and hook a couple of test wires up to the + and - terminals. With the engine not running, run current directly to your new bulb, bypassing the switch. Do both the hi and low beams work? If yes, put bulb in holder and do the same test. If all is good, hook up the switch and run current from the test leads to the switch. What happens?
Quote:
if i run the headlight direct from battery it works and so does the hi/lo switch and indicator light.

if you reference my photo above the switch gets power from the dark green wire. The dark green wire gets power from light green wire next to it. i think that light green wire runs to the stator. I just can't figure out why it lights one bulb but not the other (at least correctly) does the AC current from the stator not light Halogen bulbs?

MJRally ill check the AC/DC Volts today when i get off work.
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sorry im new to this forum stuff and i still cant get the "Quotes" right.
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bodgemaster
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Can you post the wiring diagram you're working with?
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UTC quote
im using this diagram. if you notice my switch the spades are color coated and right now my wires match the colors however the diagram shows it a little different. i have tried both ways with no luck
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In the diagram, the light green wire to the ignition switch is a fused line directly from the battery. Is that how yours is wired?
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Ok so I checked my volt meter on my new battery i got for this v90. Says 6.31v. I then turned it to the v200 with the wavy line. And on hi beam I got the 005 lo beam I got 006.

As for the other question no it does not look like my green wire runs back to my battery. There is a red wiring running down stream and the other pink running to the reg from the battery.

Pics for all are as shown.

So I notices I had my setting at 750 and not 200 tested it again and it's right at 6.5 for hi and 6.6 for lo.
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⚠️ Last edited by mikehoffer on UTC; edited 1 time
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UTC quote
I have confirmed my light green wire runs to my stator.
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UTC quote
mikehoffer wrote:
So I notices I had my setting at 750 and not 200 tested it again and it's right at 6.5 for hi and 6.6 for lo.
To answer your earlier question, AC current will definitely power a halogen bulb and you're measuring voltage at each wire so it all should work. I'm stuck until I can tear into my bike and look at the switch. Maybe look at your test bulb and verify the contacts in the back are correct for the Vespa bulb socket ie ground is ground and not really the high beam contact.
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UTC quote
i think what i need to do if buy a new headlight, instead of just this 6v halogen bulb.

does anyone know where i can buy just an original sealed beam headlight for this. all i seem to find are "upgraded" headlights.
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UTC quote
No idea where to buy sealed lamps. Ask on scoot.net. Maybe someone has some stashed somewhere. What's wrong with a newer style lens/ replaceable bulb combo?
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bodgemaster
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UTC quote
6v sealed beams are hard to come by.

It's possible that your stator isn't putting out enough juice to power the 35w halogen. I think something's funky with your new switch though.

Try this:

Disconnect the green that runs from the stator to the ignition switch.

Disconnect the brown and purple wires from the bulb holder (leave the ground).

Start the bike and use the green to supply AC current directly from the stator to the new bulb, bypassing all the switches.
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UTC quote
i do have this setup at home new still. still need bulbs for that as well. just didnt like all the plastic feels cheap.



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