Alternator Won't charge battery

[Red-Diz]

Hey guys, my bike is losing battery charge if i ride it at night (coz all the lights are on)

it's only putting out about 11v when i'm riding.

so i'm sloooowly losing power the longer i ride it.

at the moment i'm just charging my battery at the end of every week, but i was wondering if getting a new alternator was a very difficult and/or costly?

it's an old bike 86 nz250 suzi

[pesh]

sure it's not regulator / rectifier ?
have u tested it with a multimeter

[oldskool]

You need to check the out put charge of the stator but I would say its your RegRec but you need to check out put of stator first to sure.
Your stator should put out 60 + volts test this between the yellow's

[boris]

I'm no expert but I would agree with Dylan and Pesh here mostly reg/rec's that seem to play up.