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blown bulbs

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

blown bulbs

Postby Scoot655 » Tue Mar 07, 2017 5:50 am

I cant figure out why I seem to blow a lot of rear bulbs?I've recently changed the regulator and re-done the earth connections.I've also recently put a new engine in my GP so I assuming that rules out a dodgy stator as this problem was occurring before the engine change as well.
any suggestions much appreciated! :cry:
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Re: blown bulbs

Postby Knowledge » Tue Mar 07, 2017 7:58 am

Just for clarification, is this a 12v AC system?

Is it just the tail-light filament that is blowing?
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Re: blown bulbs

Postby Watfordwhite » Tue Mar 07, 2017 7:36 pm

Possibly bad Earth on the rear light to frame.
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Re: blown bulbs

Postby Meds » Tue Mar 07, 2017 10:02 pm

Try adding a earth wire that connects the back light directly to the engine earth and see if that cures it.
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Re: blown bulbs

Postby Scoot655 » Wed Mar 08, 2017 1:20 am

Knowledge wrote:Just for clarification, is this a 12v AC system?

Is it just the tail-light filament that is blowing?


yes it is a 12v AC system and just the tail light that blows. What is the best make of regulator to get and who supplies them?
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Re: blown bulbs

Postby Knowledge » Wed Mar 08, 2017 10:38 am

I think you need to check that earth before you spend money replacing a regulator that might be performing just fine. Look at the responses above: no one is pointing a finger at the regulator.

You can always check the output with a meter, to make sure it is not dramatically exceeding 12v.
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Re: blown bulbs

Postby Meds » Wed Mar 08, 2017 12:30 pm

If it was the regulator you would problems with other lamps blowing.
If you convinced it's the regulator take all the lamps out except the head light and Rev the scooter, if the headlight blows it's the regulator
Anthony Tambs sells them
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