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u need a multimeter to test the battery
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Yes a multimeter is great and if you can use one properly essential, but if you don't understand electrics it will be of limited use, ceap ones won't have an ammeter (amps reading) and this is the only sure way of checking if a rectifier is doing it's job.
Save yourself heartache and get your battery out and down to an auto electrician/motor accessory shop - they will be able to 'drop' test (load test) your battery for nowt and tell you if it's f*%ked.
If it isn't then you have to start messing with an ammeter in series with your battery and see what charging current it is getting at various revs. I'm guessing now 'cos I don't have a manual but if you get around 6Ah @ 1500 revs your battery should be well topped up.