voltage...

[CTScott]

Originally Posted by CoryM

Chicken or the egg?
A bad battery can draw down on the alternator keeping it from producing full voltage. Charge the battery (or temporarily replace with a known good one) and check your voltage again. Either way you want to have the battery charged because if you replace the alternator, the new one will overwork itself trying to charge the low battery. It is only meant to top-up the battery, not fully charge it. I would guess it is the battery in this case but hard to tell from several thousand km away ;)

Cheers.

For the battery to be bad enough to drag down the output of the alternator, it would also not be able to start the engine.