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@danie avatar
UTC

Hooked
'57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '05 GT200
Joined: UTC
Posts: 357
Location: George, South Africa
 
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@danie avatar
'57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '05 GT200
Joined: UTC
Posts: 357
Location: George, South Africa
UTC quote
Most of the times when we get hold of a vintage Vespa, the wiring is shot. Most of us would just buy a new loom, but some of us like to do our own thing. If you want to convert your vintage Vespa to 12V and need a new wiring loom, you can use the attached diagram. It has the correct colours, lengths and connections.

(To convert a 6V stator to 12V, is quite simple. There are three coils on a 6V stator: a spark coil and two lighting coils. The lighting coil with the yellow and blue wire produces 12V. Throw the other lighting coil away and fit another 12V coil in its place. Then connect the two blue wires. You now have three wires coming from the stator: red to the external ignition coil and kill switch, black to earth and blue to the voltage regulator).

The "codes" on the wiring diagram means the following:
FM means a female medium connection
FL means a female large connection
d3 means a round connection with a 3mm hole etc
ST means shrink tubing
OP
@danie avatar
UTC

Hooked
'57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '05 GT200
Joined: UTC
Posts: 357
Location: George, South Africa
 
Hooked
@danie avatar
'57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '05 GT200
Joined: UTC
Posts: 357
Location: George, South Africa
UTC quote
I forgot to mention that you start with a. The values to the left is how far the wires must protrude from the a shrink tubing.
⬆️    About 1 year elapsed    ⬇️
@xperimental21 avatar
UTC

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Super
Joined: UTC
Posts: 101
Location: -7 degrees
 
Hooked
@xperimental21 avatar
Super
Joined: UTC
Posts: 101
Location: -7 degrees
UTC quote
Great! anyway I don't really know about electricity but I'm going to convert my 6v VBC into 12v without battery and I will use LED bulbs. So i have questions

1. I think I'll buy new wiring loom rather than wiring it by myself, so do I need 12v wiring loom?
2. Also what about the rear brake switch and handelbar switch do both have to be 12v?
3. Is it necessary to install voltage regulator? which type i should use?
OP
@danie avatar
UTC

Hooked
'57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '05 GT200
Joined: UTC
Posts: 357
Location: George, South Africa
 
Hooked
@danie avatar
'57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '05 GT200
Joined: UTC
Posts: 357
Location: George, South Africa
UTC quote
1. I'm not sure if you will get a 12V wiring loom for your VBC. If your existing loom is ok, you can keep on using it with a small modification.
2. The 6V rear brake switch is an opener, whereas a 12V switch is a closure, thus you will need a new switch. You also need a new light switch.
3. LED bulbs are DC, so you will need a voltage regulator that has a DC terminal (5 connection regulator). Your horn must stay AC. If you decide to use normal bulbs, you can use a 3 connection regulator.
@chandlerman avatar
UTC

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
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Location: Nashville

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Lucky
@chandlerman avatar
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
Joined: UTC
Posts: 9975
Location: Nashville

75 Days Since Last Explosion
UTC quote
A few more notes...you can get a 12V DC horn. It costs about $100 US, though, so like 2-3x what an AC horn costs.

If you want to go 100% DC, you can get the SIP Vape Rectifier by itself and convert the system over that way.

I put a BGM 12V AC harness in my GL when I re-did it, but run the entire thing DC. The difference is that it's one or the other, no split AC/DC sides like the stock harness would be.

As Danie noted, you need to get the Normally-Open rear brake switch, but it's a straight swap to install.

The handlebar switch will work for AC or DC, but not the split system.

The last thing to make sure you understand is the concept of "Ground." Apologies if that seems patronizing, but most of the mistakes people make dealing with wiring come from not understanding the idea that ground is common across all the circuits and there's not a necessarily a "matching" wire to complete a circuit.

Good luck!
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