Ok so i went out again, started up fine. I took it for a drive, but i noticed when i turned on the headlights and the heater the clock light on the radio got really dim, as did the gear indicator on the dash.
Measured the voltage between, the neg post and the engine block and the tranny case, and it showed no voltage.
I measured running voltage between neg a pos. posts again, with heater on and headlights on, showed 11.9. With heater and headlights off, showed 12.9 volts.
I did notice the negative battery cable clamp had been broken at the bottom, and had been jimmy rigged back together.
Before i go throwing parts, is there any other definitive test i can do to rule out either the cable and/or the alternator?