[Roadtrip]

Sounds like the voltage test is good. As long as the voltage is above 12, it'll charge the battery.

Really need to do a Amp test. Check out Walmart or an Discount Auto Store for one. Or better yet, mooch one off a friend. An ampmeter is important because it will tell you if the alternator is putting out sufficient CURRENT (vice voltage). Also, an ampmeter can tell you if there's a short somewhere (even with the key off) that can slowly drain the battery. If you do have current being drawn off the battery with the key off (assuming there's no clocks, etc running on a hot bus), you can probably isolate the problem circuit by removing fuses one at a time until the ampmeter show zero.

Have you checked for bad cells in the battery with a specific gravity battery tester? If you don't have one, they're a couple of bucks at Walmart.

BTW, what kind of radio do you have . . . . one of those 500W blasters?

Are you sure you've check the clutch and brake pedal area for interfering wires, pinched wires and inadvertent shorts?

Of all problems, electrical ones are probably the most frustrating. Take you time and think logically.