osidejack,

Unless you are keeping your rig stock, remember that an alternator is a option. Not to difficult to do the swap either.

If the cost/availability of a new generator is a issue, a auto electric shop could probably rebuild your existing unit quite reasonably.

Has someone tested your rig to verify that the generator is at fault...there are other components in the system that could cause a no charge condition! It's hard on the bank account to just replace items until the problem disappears.

Stuart