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All you need is a multimeter. Give that video that was linked by @seagiant a watch.
When my alternator went bad, I knew exactly what it was, because my battery was reading 12.5v when the engine was off, and under 12.4 with engine on, meaning the alternator wasn't charging it.
I would get a booster and jump that battery. I'd also get a tender to keep it charged while you diagnose. Once you have the vehicle started, test with a multimeter.
When my alternator went bad, I knew exactly what it was, because my battery was reading 12.5v when the engine was off, and under 12.4 with engine on, meaning the alternator wasn't charging it.
I would get a booster and jump that battery. I'd also get a tender to keep it charged while you diagnose. Once you have the vehicle started, test with a multimeter.
