Modern Vespa

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!

https://www.sip-scootershop.com/download/article/1/pdf/9178a03c-a982-4b63-b1a0-f3652b961591/86134000-Schaltplan.neu.pdf?contentType=application-pdf

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

My bikes at an off site garage, I'll upload pics tonight. Thanks for the help, I really appreciate it!

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

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.

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.

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.

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.

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?

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.

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.

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.

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!

there's a downloads link from the page you posted to the diagram you need.

If it mattered they wouldn't both be yellow and they are, in fact, connected together within the unit.

Well I just tested out the wires and connections, it def does matter which yellow the blue is hooked up to. One the back pilot light doesn't go on and one it does. More results and probably questions once I sort out the wire changes from the original to the new. Thanks everyone!

Pretty sure that The 2x yellow wores are A.C. not D.C.

That is an ac regulator. The dc ones have additional two black wires.

So you're saying that, with stator power connected to one yellow the back light works but to the other it doesn't??
As you only mention the back light, I take all other lights are working ok with it in that position.

Yes, with power to the bike the yellow to blue connection has to be right and not just either, or the back brake will not light. Tbh, I didnt test the it with the front headlight and horn yet, as I'm still trying to sort out the colors (as they are different then the lay out of my headlight and switches).