OP
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Molto Verboso
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Molto Verboso
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Hi,

Where is the alternator on a gs150 ?

Can it be easily fixed / cheap to replace ?

Is it neccessary to replace the battery ?

Thanks
OP
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Molto Verboso
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Molto Verboso
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I have come across a GS 150, but will not start due to an alternator / dead battery problem.

Does anyone have any info on this ?
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Molto Verboso
1974 Rally 200, 1977 Rally 200, 1958 LD125 Mk III, 1965 S.S. 180 and on and on
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Location: Van Nuys, CA
 
Molto Verboso
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1974 Rally 200, 1977 Rally 200, 1958 LD125 Mk III, 1965 S.S. 180 and on and on
Joined: UTC
Posts: 1308
Location: Van Nuys, CA
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There is no "alternator" per se. As with all Vespas there is a "magneto" assembly comprised of the rotating flywheel magnets and the stator plate coils. This magneto generates alternating current and, in the case of the GS150 and (other battery bikes), this AC current is transformed to DC via a rectifier in order to charge the battery. The rectifier is in that box next to the battery and looks like a bolt with a few plates on it. This is called a selenium or "plate" rectifier. Later models, starting in the mid-'70s began using solid-state rectifiers.

A healthy battery is very important on a GS150 (and on very early GS160s). All other Vespa models use a pure AC magneto ignition and do not require the battery to in order to run. The GS150, on the other hand uses a battery/points/HT coil ignition a lot more akin to older cars and larger motorcycles of the era.

What are your current symptoms? Your stator/magneto can be rewired and refurbished, coils swapped, etc. (a service we offer), but a little more info and some guided troubleshooting could help us determine if that is in fact the issue.
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Hooked
Too damn many
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Location: Seattle, WA
 
Hooked
Too damn many
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Location: Seattle, WA
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Quote:
A healthy battery is very important on a GS150
Just want to reiterate this point. It will not start without a good battery. And if you are somehow able to get it to start, it still will not run properly if the battery is weak.
OP
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Molto Verboso
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Molto Verboso
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Hi, thanks for your replies

The GS battery does not charge anymore, so it is unable to start due to no spark ?

Would this mean it is the rectifier is not transforming the current and stopping it from starting?

Is is likely to be the condenser or regulator ?

Or is it best to just replace the coils ?

Many thanks
OP
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Molto Verboso
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Molto Verboso
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or ignition coil ?
@bar_italia_classics avatar
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Molto Verboso
1974 Rally 200, 1977 Rally 200, 1958 LD125 Mk III, 1965 S.S. 180 and on and on
Joined: UTC
Posts: 1308
Location: Van Nuys, CA
 
Molto Verboso
@bar_italia_classics avatar
1974 Rally 200, 1977 Rally 200, 1958 LD125 Mk III, 1965 S.S. 180 and on and on
Joined: UTC
Posts: 1308
Location: Van Nuys, CA
UTC quote
You need to start with a fresh battery, then check for spark.
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Molto Verboso
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Molto Verboso
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fresh battery - horn works, and there is spark
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Hooked
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Hooked
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You are asking lots of questions but not saying much about exactly what the problem is...

So you are saying that you have a fresh battery, spark is good, but the scooter still won't start?
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