OP
UTC

Lurker
Vespa 100 Sport
Joined: UTC
Posts: 2
Location: Canada
 
Lurker
Vespa 100 Sport
Joined: UTC
Posts: 2
Location: Canada
UTC quote
i have a '73 100 sport and when i hit the brake pedal the high beam goes on, on the headlight , and the brake light goes on too. im looking at the wiring and someone replaced the wires with a 5 wire trailer harness... in the past 50 years

any suggestions and help is greatly appreciated!
@garncarz avatar
UTC

Molto Verboso
1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1972 Suzuki T500J
Joined: UTC
Posts: 1022
Location: York, PA (the intellectual center of the universe)
 
Molto Verboso
@garncarz avatar
1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1972 Suzuki T500J
Joined: UTC
Posts: 1022
Location: York, PA (the intellectual center of the universe)
UTC quote
Welcome. Pictures of your scoot will help. Also the serial number of the engine and the frame.

Harness schematics here: https://www.scooterhelp.com/electrics/70.elec.html

Replacement harnesses here: https://www.scootermercato.com/Scooter-Parts/Prim-V90?search=wiring+harness+
OP
UTC

Lurker
Vespa 100 Sport
Joined: UTC
Posts: 2
Location: Canada
 
Lurker
Vespa 100 Sport
Joined: UTC
Posts: 2
Location: Canada
UTC quote
Here's my scooter (V9B1T)
73 Vespa with wiring problems
73 Vespa with wiring problems
100
100
What's here! Awful
What's here! Awful
@mjrally avatar
UTC

Veni, Vidi, Posti
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 59 Ser 2, 65 Silver Special, 90 V5N 50, 2015 HD Road Glide Special
Joined: UTC
Posts: 5142
Location: Oceanside, CA
 
Veni, Vidi, Posti
@mjrally avatar
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 59 Ser 2, 65 Silver Special, 90 V5N 50, 2015 HD Road Glide Special
Joined: UTC
Posts: 5142
Location: Oceanside, CA
UTC quote
There's no way you're going to easily repair that. Best to buy a new harness and replace. Since you just have a taillight and nothing special, it should be an easy harness to source.
@garncarz avatar
UTC

Molto Verboso
1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1972 Suzuki T500J
Joined: UTC
Posts: 1022
Location: York, PA (the intellectual center of the universe)
 
Molto Verboso
@garncarz avatar
1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1972 Suzuki T500J
Joined: UTC
Posts: 1022
Location: York, PA (the intellectual center of the universe)
UTC quote
Here is a good video on how to swap out a harness:

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