Vespa Electrical

April 8, 2017

A. Vespa Electrical Parts for US mopeds 1972-85

Original condenser
 said “Facet”, orig.
points said “Icet”, coil said “Femsa”

This table of Piaggio part numbers contains most electrical parts on most US models.

Abbreviations:

For switches, N.C. means “Normally Closed”     N.O. means “Normally Open”

For brake light switches,

NCI means “Normally Closed when Installed” (normally open not installed)

NOI means “Normally Open when Installed” (normally closed not installed) 

Vespa
mopeds >
USA
models
72-75
Ciao
C7E1T
C7N1T
76-77
Ciao
78-80
Ciao C7E1T
77
Bravo
78-80
Bravo EEV1T
78-80
Grande
048
79-85
Si
SIV1T
80-83
Grande
MX
068
81-83
Ciao PX
C7E1T
1972-75
Ciao
C7E1T/B
1976-77
Ciao
C7E1T/B
Bravo
EEV1T/B
1978-80
Ciao
C7E1T/B
Bravo
EEV1T/B
78-80
Grande
048/B
80-83
Grande
MX

068/B
Electrical
Version >
turn
signals
turn
signals
turn
signals
turn
signals
turn
signals
points 103133 103133 103133 103133 103133 103133 103133 103133 103133 103133 103133 103133
condenser 144241 102939 102939 102939 102939 102939 102939 152440 162935 162935 162935 162935
ignition
source coil
120391
external
ground
120391
external
ground
120391
external
ground
120391
external
ground
189813
external
ground
120391
external
ground
212403
external
ground
120391
external
ground
162933
external
ground
185047
internal
ground
162933
external
ground
185047
internal
ground
ignition
spark coil
143062 143062
132299
124830
132299
132299 132299 132299 132299 143062 132299 132299 132299 132299
spark plug
NGK #
121908 143541
B5HS
143541
B5HS
137776
B6HS
A15029 137776
B6HS
143541
B5HS
121908 143541
B5HS
143541
B5HS
143541
B5HS
137776
B6HS
flywheel 103485 103485 103485 103485 176418 103485 176418 103485 148125 148125 148125 148125
lights coil 120397 120397 120397 120397 189812 120397 214547 120397 162929 162929 162929 162929
aux. coil none none none none none none none none none
162930
185048 162930 185048
main key
switch
143972
2-pos.
none none none none none none 152453
2-pos.
147556
162912
162912
3-pos.
162912
3-pos.
307872
2-pos.
brake light
switches
connection
126938
NCI in
series
126938
NCI in
series
126938
NCI in
series
126938
NCI in
series
126938
NCI in
series
126938
NCI in
series
126938
NCI in
series
126938
NCI in
series
126938
NCI in
series
126899
NOI in
parallel
126938
NCI in
series
126899
NOI in
parallel
light
switch
143972 156645 156645 307113 186515 307113 186515 152453 147556
162912
162912 162912 307872
2-pos.
horn switch
CEV #
128598
N.O
Grabor
156645
N.O.
8040
156645
N.O.
8040
307113
N.O.
8188
189834
N.O.
Grabor
307113
N.O.
8188
213516
N.O.
Grabor
128598
N.O.
Grabor
147304
163376
N.C.
163376
N.C.
Grabor
307264
N.C.
8192
307297
N.C.
Grabor
run switch
type
CEV #
none 147305
N.O.
8177
147305
N.O.
8177
307114
N.O.
8189
189833
N.O.
Grabor
307114
N.O.
8189
189833
N.O.
Grabor
none 147305
N.O.
8177
147305
N.O.
8177
307263
N.O.
8191
307263
N.O.
8191
turn switch none none none none none none none 144474
CEV188
147304
163377
147304
163377
307263
8191
307263
8191
tail light
CEV #
color
142805
4350
chrome
142805
4350
chrome
142805
185028
4400.2
307162
4350
chrome
187583
CEV234
black
307877
4400
black
189054
Becar
black
142805
4350
chrome
142805
4350
chrome
185026
4400
grey
307162
4350
chrome
307877
4400
black
headlight
CEV #
color
145107
2139V
lt. grey
156729
161395
silver
161395
2139
silver
307110
2143
chrome
189870

dk grey
307868
2143
black
189870

dk grey
152452
2139V
lt. grey
147554
162909
silver
162909
2139V
silver
307262
2139V
chrome
307868
2143
black
hl housing 307239 no # 307869 no # 307339 307869
impedence
coil in hl
156045 none none none none none none 156045 156045
none
none none none
hl bulb
6V sealed
121559
CEV171
121559
CEV171
121559
CEV171
307238 A10004
4667-1
307238 A10004
4667-1
121559
CEV171
121559
CEV171
121559
CEV171
121559
CEV171
121559
CEV171
Vespa
mopeds >
USA
models
72-75
Ciao
C7E1T
C7N1T
76-77
Ciao
78-80
Ciao C7E1T
1977
Bravo
78-80
Bravo EEV1T
78-80
Grande
048
79-85
Si
SIV1T
80-83
Grande
MX
068
81-83
Ciao PX
C7E1T
72-75
Ciao
C7E1T/B
76-77
Ciao
C7E1T/B
Bravo
EEV1T/B
78-80
Ciao
C7E1T/B
Bravo
EEV1T/B
78-80
Grande
048/B
80-83
Grande
MX

068/B

 

102939

103133

120391

120397

 

 

 

 

 

 

126899 = CEV 9343

126938 = CEV 9342

126939

128598

See Switches

 

 

 

 

142805, 307162 = CEV 9350

143972 (w/key)
2-position with diode

144241 early condenser

 

 

 

 

 

 

 

144474

145107

145107 partial

147304

 

 

 

 

 

 

147305
CEV 8177

147554

147556 (with key)
3-position with diode

148125

 

 

 

 

 

 

 

156045?

156645
CEV 8040

161395

162909

 

 

 

 

 

 

 

162912 (plus key) 3-position, no diode

162935 condenser for blinker models

 

 

 

 

 

 

 

162929

162930

162933

163376
Grabor N.C.

 

 

 

 

 

 

 

185026
CEV 9400 grey

185028
CEV 9400.2 grey

185048

 

See Tail lights

 

 

 

 

 

186515

187893

189054

189833 Si switch

189834

 

 

 

 

 

 

189870

192930 Si lens

307113
= CEV 8188

307114
= CEV 8189

307262
= CEV 2139V

 

 

 

 

 

 

 

307263
= CEV 8191

307264
 CEV 8192 N.C.

307297
Grabor N.C.

307872

307877
 CEV 9400 black

 

307xxx parts for Grande.

See Tail lights

 

 

 

 


B. Wiring Diagrams

Original wiring diagrams were scanned from original Owners Manuals, or Assembly and Preparation Manuals.

 

Original Wiring Diagrams for models without turn signals

No original available
1972-75 Vespa Ciao
4-wire magneto with
external ignition ground

Original wiring diagram
1976-80 Vespa Ciao
 4-wire magneto with
external ignition ground

Original wiring diagram
1977-80 Vespa Bravo
4-wire magneto with
external ignition ground

Original wiring diagram
1978-80 Vespa Grande
4-wire magneto with
external ignition ground

 

 

 

 

 

 

 

 

 

Original wiring diagram
1979-83 Vespa Si
4-wire magneto with
external ignition ground

Original wiring diagram
1980-83 Vespa Grande
4-wire magneto with
 external ignition ground

Original wiring diagram
1980-85 Vespa Ciao PX
4-wire magneto with
external ignition ground

All of these have an external ignition ground, which is the blue magneto wire. It must be connected to ground in order to have “spark”.

 

 

 

 

 

 

 

 


Original Wiring Diagrams for models with turn signals

No original available
72-75 Ciao with blinkers
4-wire magneto with
external ignition ground

No original available
76-77 Ciao with blinkers
4-wire magneto with
external ignition ground

No original available
1977 Bravo with blinkers
 6-wire magneto with
external ignition ground

Original wiring diagram
78-80 Ciao with blinkers
 6-wire magneto with
internal ignition ground

 

 

 

 

 

 

 

 

 

Original wiring diagram
78-80 Bravo w/ blinkers
 6-wire magneto with
internal ignition ground

Original wiring diagram
78-80 Grande w/blinkers
6-wire magneto with
external ignition ground

Original Wiring Diagram
80-83 Grande w/blinkers
 6-wire magneto with
internal ignition ground

Most of these have an external ignition ground, which is the blue magneto wire. It must be connected to ground in order to have “spark”.

 

 

 

 

 

 

 


Myrons Wiring Diagrams

Making these wiring diagrams was difficult and took over 150 hours of study. Some original diagrams were not available. To produce them, 1) all the Vespa USA-models and years had to be identified, 2) the parts catalogs and amendments were studied to make the table of electrical part numbers, 3) actual parts from Myrons inventory were photographed, or images from the internet were collected, to identify every electrical part, 4) some of the parts, especially switches, were tested to determine their internal wiring and function, 5) some actual wirings from stripped out mopeds were photographed and studied, matching each actual wire to the diagrams. 

 

1972-75 Vespa Ciao
4-wire 2-coil magneto with external ignition ground

1972-75 Vespa Ciao with blinkers
4-wire 2-coil magneto with external ignition ground

 

 

 

 

 

 

 

 

 

 

 

1976-80 Vespa Ciao and Bravo
4-wire 2-coil magneto with external ignition ground

1976-77 Vespa Ciao with blinkers
4-wire 2-coil magneto with external ignition ground

 

 

 

 

 

 

 

 

 

 

 

1977 Vespa Bravo with blinkers
6-wire 3-coil magneto with external ignition ground

1978-80 Vespa Grande with blinkers
6-wire 3-coil magneto, external ignition ground

 

 

 

 

 

 

 

 

 

 

 

1978-83 Vespa Grande, Grande MX 
4-wire 2-coil magneto, external ignition ground

1978-80 Vespa Ciao and Bravo with blinkers
6-wire 4-coil magneto, internal ignition ground

 

 

 

 

 

 

 

 

 

 

 

1980-83 Vespa Ciao PX
4-wire 2-coil magneto, external ignition ground

1980-83 Vespa Grande MX with blinkers
6-wire 4-coil magneto, internal ignition ground

 

 

 

 

 

 

 

 

 

 

 

 


C. Electrical Service

Magneto-Generator and Engine Wires

Top coil is ignition source coil. One end (red with eyelet) goes to the points. The other end goes to ground, either internally or externally.

Bottom coil is lights source coil. One end is grounded internally. The other end (with red plug) goes to the main lights.

Side coil is auxiliary lights, only on turn signal models. Both ends go to a rectifier for battery charging.

1976-80 Vespa Ciao

1978-80 Vespa Grande

1978-80 Vespa Grande
with turn signals

 

 

 

 

 

 

 

 

Vespa Ciao with blinkers, ignition wire behind points is corroded badly

Bad wires: 1970’s Vespa moped wires are often corroded badly. They all have faded brittle insulation that breaks in places, exposing the braided copper core. Here is a turn signal model Ciao with a vital wire shorting out secretly behind the points. All of the wires near the engine are cracked and corroded badly, in places. They break like glass when you try to bend them.

 

 

 

Vespa Ciao with blinkers, brittle and badly corroded condenser wires

Bad wires: The bad wire shown above is this condenser wire. This is a turn signal model Ciao, with the condenser mounted externally. Non-turn-signal models have internal mounted condensers. This poor wire is actively shedding green flakes of copper oxides. Also note that the blue wire (external ignition ground) is faded to dark grey. It is also cracked open and corroding. Both of these wires are needed to run.

 

 

 

Replacing engine wires: Many 1970’s Vespa mopeds need their engine wires replaced. Many have intermittent or no spark, or dim or flickering lights, because of bad wires. Some electronic or hardware stores sell braided copper wire by the foot, but some only have 50 ft rolls. The old connectors can be cleaned and re-soldered to the new wire. That requires good flux-core solder and some skill.