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  #1  
Old 07-02-2019
Jallopy Jallopy is offline
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Beta Alternator Not Charging

Beta Alternator not charging when the engine is rev'd a little or a lot.
It appears to be charging only at idle.
What could it be?

Beta 2019, Same as 2016 - 2019 4T.

Battery volts 12.6.
When at idle the voltage on multi meter only goes up slowly (12.8v) after 2 minutes
If the revs go up the voltage drops again to approx what would be in the battery if the engine was off. Let it idle and the volts will slowly increase again.

Has about 26v ac at the 3 stator wires at idle. ( Only speed I can check)

Did diode test on Rectifier Regulator and everything checked out perfect.

Earth appears to be ok

Anyone know what could be the problem. Or what can I check next.
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  #2  
Old 07-02-2019
Nutty Nutty is offline
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Quote:
Originally Posted by Jallopy View Post
Beta Alternator not charging when the engine is rev'd a little or a lot.
It appears to be charging only at idle.
What could it be?

Beta 2019, Same as 2016 - 2019 4T.

Battery volts 12.6.
When at idle the voltage on multi meter only goes up slowly (12.8v) after 2 minutes
If the revs go up the voltage drops again to approx what would be in the battery if the engine was off. Let it idle and the volts will slowly increase again.

Has about 26v ac at the 3 stator wires at idle. ( Only speed I can check)

Did diode test on Rectifier Regulator and everything checked out perfect.

Earth appears to be ok

Anyone know what could be the problem. Or what can I check next.
I'd swap the battery first John. make sure its not loading the alternator as the excitation comes up. Is it lead-acid or Li-ion?

AC idle voltage is ball-park.
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  #3  
Old 07-02-2019
Jallopy Jallopy is offline
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Pete, I have swapped batteries . Took it out of my other 2015 Beta 390
I have 2 li-ion batteries both less than 5 mths old and have run a load test etc and they both pass.

I cant check the stator ac voltage at faster revs because when I release my thumb of the starter button the engine dies.
The reg / rec. must power up something to keep the engine running when it is all connected.
That r/r plug has 3 thick white wires and 1 red and 1 black wire.
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Old 08-02-2019
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Roon Roon is offline
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John, I suggest you physically plug and replug all the connectors, donít rely on just a visual check.
Itís resolved similar issues on 2 Betas recently.
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Old 08-02-2019
Jallopy Jallopy is offline
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I have re plugged the ones around the fuses, headlight etc but I will remove the tank and have a good look for any faults.

Im off for my 30 minute push bike ride now, when i get back Ill have another dig to see what the trouble is.

No kick start on this model, so it is bump start only in the bush if the battery depletes.
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Old 08-02-2019
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Roon Roon is offline
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Quote:
Originally Posted by Jallopy View Post
I have re plugged the ones around the fuses, headlight etc but I will remove the tank and have a good look for any faults.

Im off for my 30 minute push bike ride now, when i get back Ill have another dig to see what the trouble is.

No kick start on this model, so it is bump start only in the bush if the battery depletes.
Go over all the connectors in the triangular cavity in the main frame under the tank, thats where Ive had some connectors that looked good, but after much tail chasing/swapping components found that there was a connection that wasn't 100% positively engaged.
As always, we should start with the basics before going off on tangents
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Old 08-02-2019
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gibnut gibnut is offline
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Obviously, diagnose & fix the real issue but these little things are great and weigh about 300g.
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File Type: jpg 94EFFF9C-B571-4A9D-92F9-BEB8AD5A064E.jpg (69.2 KB, 48 views)
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Old 08-02-2019
Jallopy Jallopy is offline
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Cameron had the right idea, check all the plugs.

Removed the tank and the first bullet connector I looked at was not pushed "home" it was tight but still needed another 4mm to go and to get it to go in, it was very very hard.

Replaced the tank, and the battery charged at idle and reving .

Hopefully That was the problem. Intermittent faults are a nightmare to find - everything appears to be working then the fault appears again.

Earth bullet connector

Update : This connector is only for the map switch. Nothing to do with the charging system.
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  #9  
Old 08-02-2019
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Medium Rare Medium Rare is offline
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Quote:
Originally Posted by Jallopy View Post
Cameron had the right idea, check all the plugs.

Removed the tank and the first bullet connector I looked at was not pushed "home" it was tight but still needed another 4mm to go and to get it to go in, it was very very hard.

Replaced the tank, and the battery charged at idle and reving .

Hopefully That was the problem. Intermittent faults are a nightmare to find - everything appears to be working then the fault appears again.

Earth bullet connector
The Beta tech who did the wiring probably had some olive oil left on his hands from smoko and couldn't get a firm grip. I'd check for spaghetti in the air box, I hear it's common

https://www.youtube.com/watch?v=SxRo3cejh94
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  #10  
Old 10-02-2019
Marty MOOSE Marty MOOSE is offline
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Quote:
Originally Posted by Jallopy View Post
Cameron had the right idea, check all the plugs.

Removed the tank and the first bullet connector I looked at was not pushed "home" it was tight but still needed another 4mm to go and to get it to go in, it was very very hard.

Replaced the tank, and the battery charged at idle and reving .

Hopefully That was the problem. Intermittent faults are a nightmare to find - everything appears to be working then the fault appears again.

Earth bullet connector
Good find thanks for the pic.
MM
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