OP
@mad avatar
UTC

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1979 Vespa 50cc Special
Joined: UTC
Posts: 23
Location: Houston, Texas
 
Member
@mad avatar
1979 Vespa 50cc Special
Joined: UTC
Posts: 23
Location: Houston, Texas
UTC quote
My Vespa 50 Special blows the taillight at high rpms. I can replace the bulb and it works fine until I ride fast - then it blows the taillight. The break light works fine and does not blow. I replaced the entire taillight assembly and still have the same problem. any thoughts? Many thanks for your input.
Cheers,
M. Daleo
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@bajarob avatar
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1961 VS5T, 1981 P200E, Rigid Frame Chopper, 2001 Harley FXDXT
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Location: Ventura, CA
 
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@bajarob avatar
1961 VS5T, 1981 P200E, Rigid Frame Chopper, 2001 Harley FXDXT
Joined: UTC
Posts: 928
Location: Ventura, CA
UTC quote
MAD wrote:
My Vespa 50 Special blows the taillight at high rpms. I can replace the bulb and it works fine until I ride fast - then it blows the taillight. The break light works fine and does not blow. I replaced the entire taillight assembly and still have the same problem. any thoughts? Many thanks for your input.
Cheers,
M. Daleo
My guess would be it's getting too many volts at the higher rpms like it's a regulator issue. I'm not familiar with your electrical system but you could put a meter on it at your light and measure the volts as you increase throttle and see if it keeps climbing.
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Hooked
300gts super sport
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Location: N.Wales
 
Hooked
300gts super sport
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Location: N.Wales
UTC quote
I had a similar problem on a Rabeneick Moped. That had no battery and no voltage regulator I could see. I solved the problem by fitting another tail light bulb in series. Eg I took positive lead from the bulb , then connected it to a simple plastic bulb holder which stayed inside the light assembly then I grounded the second bulb.

Then when the bike revved both bulbs came on, they were dimmer than just one , but as I never rode at night that wasnt an issue. Also the bike passed its annual mot test as all bulbs worked.
OP
@mad avatar
UTC

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1979 Vespa 50cc Special
Joined: UTC
Posts: 23
Location: Houston, Texas
 
Member
@mad avatar
1979 Vespa 50cc Special
Joined: UTC
Posts: 23
Location: Houston, Texas
UTC quote
Quite a creative work-around.
@ray8 avatar
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Molto Verboso
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Location: Los Angeles
 
Molto Verboso
@ray8 avatar
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Location: Los Angeles
UTC quote
Originally both rear lights would have been off battery DC(?).

If you connect the key switch directly to stator power it will blow that bulb.

&t=1s
OP
@mad avatar
UTC

Member
1979 Vespa 50cc Special
Joined: UTC
Posts: 23
Location: Houston, Texas
 
Member
@mad avatar
1979 Vespa 50cc Special
Joined: UTC
Posts: 23
Location: Houston, Texas
UTC quote
Thanks - After watching that video it seems that it would it stop blowing the bulb if I put a battery in it?
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