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Dc electrics

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

Re: Dc electrics

Postby ULC Soulagent » Sun Nov 03, 2019 5:06 pm

Toddy wrote:Try another Wassell first ;)

:D mr Tambs getting an order soon
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Re: Dc electrics

Postby Fast n Furious » Sun Nov 03, 2019 5:16 pm

assuming its a stator with 2 yellow wire coming out of it, use a multi-meter set to 200VAC to measure the AC output from the magneto stator. If this seems ok when revved out, then measure the output from your rectifier/ regulator (Wassel) which should read between 13.5-14.0VDC.
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Re: Dc electrics

Postby ULC Soulagent » Sun Nov 03, 2019 6:17 pm

Fast n Furious wrote:assuming its a stator with 2 yellow wire coming out of it, use a multi-meter set to 200VAC to measure the AC output from the magneto stator. If this seems ok when revved out, then measure the output from your rectifier/ regulator (Wassel) which should read between 13.5-14.0VDC.

Don’t have 200vac on my meter ( only 750 & 1000) :| on the 1000 setup the Stator yellow wires are showing only 11v, when connected to the wassel there is nothing even when the battery is connected :(
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Re: Dc electrics

Postby ULC Soulagent » Sun Nov 03, 2019 6:19 pm

Gonna have too wait as Mr Tambs is on hols and for some strange reason SLUK shop has all of Tambs products pulled :roll:
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Re: Dc electrics

Postby coaster » Sun Nov 03, 2019 7:11 pm

ULC Soulagent wrote:
Fast n Furious wrote:assuming its a stator with 2 yellow wire coming out of it, use a multi-meter set to 200VAC to measure the AC output from the magneto stator. If this seems ok when revved out, then measure the output from your rectifier/ regulator (Wassel) which should read between 13.5-14.0VDC.

Don’t have 200vac on my meter ( only 750 & 1000) :| on the 1000 setup the Stator yellow wires are showing only 11v, when connected to the wassel there is nothing even when the battery is connected :(


That does suggest a stator problem, have you checked for any bad soldered joins on the stator and that to wires aren't pinched and shorting behind the stator? You should read around an ohm or so across the lighting coils.
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Re: Dc electrics

Postby MickYork » Sun Nov 03, 2019 8:21 pm

Have you changed the meter to dc when checking the Wassell output ? variable ac in, regulated dc out
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Re: Dc electrics

Postby Fast n Furious » Sun Nov 03, 2019 9:15 pm

As Coaster advised, Do a resistance check across both yellow wires and also do an insulation check from any yellow wire and the engine casing.
If the Wassel is short circuit, it will drag down any measurement of the AC "in" value. So disconnect the yellow wires from the regulator and then connect your meter to these wires and set the AC 750V range.
Start the engine.
When revved out you should see over 100VAC on this open circuit connection.
A very low reading would suggest that both yellow wires are nipped to earth somewhere forming a low resistance short circuit.
Negligible reading would suggest an open circuit coil or wire.
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Re: Dc electrics

Postby ULC Soulagent » Sun Nov 03, 2019 9:48 pm

MickYork wrote:Have you changed the meter to dc when checking the Wassell output ? variable ac in, regulated dc out

Unsure MickYork, I’ll take a pic of meter tomorrow and post it up and go from there :D
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Re: Dc electrics

Postby ULC Soulagent » Sun Nov 03, 2019 9:51 pm

Fast n Furious wrote:As Coaster advised, Do a resistance check across both yellow wires and also do an insulation check from any yellow wire and the engine casing.
If the Wassel is short circuit, it will drag down any measurement of the AC "in" value. So disconnect the yellow wires from the regulator and then connect your meter to these wires and set the AC 750V range.
Start the engine.
When revved out you should see over 100VAC on this open circuit connection.
A very low reading would suggest that both yellow wires are nipped to earth somewhere forming a low resistance short circuit.
Negligible reading would suggest an open circuit coil or wire.

I’ll check that out tomorrow FnF :D
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Re: Dc electrics

Postby Meds » Mon Nov 18, 2019 9:59 am

Did you manage to sort it out?
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Re: Dc electrics

Postby ULC Soulagent » Mon Nov 18, 2019 5:36 pm

Nearly there Meds, lack of garage space and crap weather been a hindrance. Stator is fine, looking like wassel too Blame :?
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Re: Dc electrics

Postby Meds » Mon Nov 18, 2019 6:22 pm

Good news the stator is ok
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Re: Dc electrics

Postby Meds » Fri Feb 07, 2020 8:02 pm

Got round to checking an unloaded standard electronic type stator converted to operate a DC system
60-75v AC at tickover
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Re: Dc electrics

Postby dickie » Fri Feb 07, 2020 10:19 pm

Simple test.

Measure battery voltage.
Start bike.
Rev to 3000rpm (ish)
Measure battery voltage

If the battery voltage is higher with motor running, then that's good. If it's lower, then it's bad, in other words, not charging.
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Re: Dc electrics

Postby ULC Soulagent » Fri Feb 07, 2020 11:13 pm

dickie wrote:Simple test.

Measure battery voltage.
Start bike.
Rev to 3000rpm (ish)
Measure battery voltage

If the battery voltage is higher with motor running, then that's good. If it's lower, then it's bad, in other words, not charging.

Cheers Dickie :D
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Re: Dc electrics

Postby ULC Soulagent » Fri Feb 07, 2020 11:15 pm

Meds wrote:Got round to checking an unloaded standard electronic type stator converted to operate a DC system
60-75v AC at tickover

Good too know Meds ;)
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Re: Dc electrics

Postby Meds » Sat Feb 08, 2020 2:05 am

ULC soul agent
What was the fault in the end?
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Re: Dc electrics

Postby ULC Soulagent » Sat Feb 08, 2020 8:18 am

Meds wrote:ULC soul agent
What was the fault in the end?

Hi Meds,
Too be honest I ain’t got a foggy idea where the fault lies, have bought a scootronics stator n wassel n new hi power cdi stuff that I’ll be fitting soon. Like I said electrics ain’t one of my strong points on anything :lol:
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Re: Dc electrics

Postby dickie » Sun Feb 09, 2020 2:02 pm

Meds wrote:Got round to checking an unloaded standard electronic type stator converted to operate a DC system
60-75v AC at tickover

What do you mean when you say unloaded? Were both yellow wires open circuit?
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Re: Dc electrics

Postby ULC Soulagent » Sun Feb 09, 2020 4:36 pm

This is my tester, not sure if it’s the right Type Image
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