Voltage doesn't really mean anything, especially with an external source (like the alternator of the donor vehicle) pulling up the system voltage. You need to get your car running on its own, then check. However, driving for an hour pretty much confirms that the alt is good, and your suspicion is correct, you generally would get a warning light if the charging system isn't working properly.
A new battery pretty much rules out that as the issue.
The fact that the lights don't dim means that there is no load applied from that starter. Like I said, the next step is to make sure the starter itself is seeing voltage on the small wire in POS3. After that, R&R the starter.