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Vespa Preme 67' & Stella 2S 09'
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I am looking for a wiring diagram for Wiring Loom for conversion to E-Ignition/DUCATI (https://www.sip-scootershop.com/en/product/wiring-loom-conversion-to-e-ignition-ducati_86134000)

I purchased it because it said it fit my smallframe for a electric ignition conversion and when I opened it I think there some extra wires I do not recognize. Any help would be appreciated, thanks!
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My harness seems to have 4 branches past the back brake. I get ones for engine, one for regulator, one for brake light, but what is the 4th one for?
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Aphasia wrote:
My harness seems to have 4 branches past the back brake. I get ones for engine, one for regulator, one for brake light, but what is the 4th one for?
pics would help
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My bikes at an off site garage, I'll upload pics tonight. Thanks for the help, I really appreciate it!
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Here's the 4 spurs off the back. From top to bottom in the pic
1: 2 red wires
2: 1 red & 1 black
3: 1 black, 1 blue, 1 green
4: 2 blue, 1 black that splits to another clip
Forum member supplied image with no explanatory text
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it is exactly as described on the diagram.
1. brake pedal switch
2. Brake light
3. junction box
4. Regulator.


not being an ass here, but did you spend any time with the diagram and your harness? with a good, cold beverage in hand, that wiring loom is pretty simple to wrap you head around.
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Thank you, I am very green and I'm just trying all this for the first time. I really appreciate the diagram and help! I'm pretty intimidated doing the work but I wanted to dive in and start knowing my bike and the parts more.
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So im circling back as im working, i have a problem and not sure what to do. Wiring harness has 2 blue 2 black (one being the looped ground) but my regulator has 2 inputs. I'm not sure what to do with the blues, can i combine the blue wires to 1? or do i now need a different regulator cause that would create 24v?
Forum member supplied image with no explanatory text
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Aphasia wrote:
So im circling back as im working, i have a problem and not sure what to do. Wiring harness has 2 blue 2 black (one being the looped ground) but my regulator has 2 inputs. I'm not sure what to do with the blues, can i combine the blue wires to 1? or do i now need a different regulator cause that would create 24v?
blue to yellow
blue to yellow
black to ground.
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So i can just ground both blacks to the bike and not have it go into the regulator?
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Aphasia wrote:
So i can just ground both blacks to the bike and not have it go into the regulator?
ground it to the regulator. see your diagram above.
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Sorry again i'm really new to this, the regulator only has 2 inputs and the wiring harness has 2 blue outputs, 1 black output, and another black that has an O ring that i clearly ground to the bike via a screw. I get the 2 blue to the two yellow, but that's all the inputs of the regulator. I can replace one of the clasps with another O ring and ground both to the frame?
⚠️ Last edited by Aphasia on UTC; edited 1 time
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Molto Verboso
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
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Molto Verboso
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To add to Mr gick,

Blue from the junction box goes to the right side yellow
Blue that goes to the lights and such goes with the left yellow as shown in the wiring diagram. Also make sure that regulator is solidly grounded to the frame.
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Molto Verboso
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
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Molto Verboso
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UTC quote
Aphasia wrote:
Sorry again i'm really not to this, the regulator only has 2 inputs and the wiring harness has 2 blue outputs, 1 black output, and another black that has an O ring that i clearly ground to the bike via a screw
One of the blues goes to the lights that's the output. One blue comes from the junction box/stator. Follow the diagram and use the correct blue for each attachment to the yellows.
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FridayMatinee wrote:
Follow the diagram and use the correct blue for each attachment to the yellows.
It doesn't matter which blue goes to which yellow.
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Molto Verboso
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
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firekdp wrote:
It doesn't matter which blue goes to which yellow.
I beg to differ. Both VAPE systems I have won't work with the wires switched.
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Thank you all, I'm doing hook up this friday and will check back in after that! Thanks again for all the help and advice!
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there's a downloads link from the page you posted to the diagram you need.
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FridayMatinee wrote:
I beg to differ. Both VAPE systems I have won't work with the wires switched.
If it mattered they wouldn't both be yellow and they are, in fact, connected together within the unit.
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