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I would agree with you under these circumstances. I just really hate replacing parts without troubleshooting, but you say no access to a volt meter, so I would have to agree with replacing the alternator. I would just hate for you to replace the alternator and still have the same issue.
If you have time, and your planning on replacing it anyways, you should uninstall it, and take it apart, I would clean the contact side of the rotor, and lightly file down the brushes and then put it back together and reinstall to test it.
I have managed to save a few alternators using that little trick, and if it doesn't work, then hey, you were gonna replace it anyways.
05 Lariat Crew Cab, Short Bed, 142K and counting, 4x4, ARP studs, EGR Delete, IPR High Flow Coolant Filter, Dash Boss, SCT SF3 innovative tunes, Innovative FICM Tuner, Deleted CAT and Muffler, blue spring upgrade, High idle mod, Cobra 29 LXE.