The voltage is under the seat, at the back, close to the rear mudguard.
Your battery sounds buggered.
A volt meter should read about 12-13v with the engine off.
With the engine running, anything about 14-15v is ok.
As your is showing 17v, its possible it is because the battery is totally shagged, and its pumping in loads of charge to try and charge it.
It sounds like a new battery is needed, about £30.
I'd then test again, and if thats getting 17v, then i'd also replace the reg/rectifier. I think theres a post on here, and there about £33.
Worst case scenario your looking about £65
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