Alternator output results: dead alternator? *Updated results*

[Gabbastard]

Car in question is my AX with a VTS engine and alternator(5groove pulley type), so VTS setup but without PAS or ABS.

Car chuckdd it the other week coming back from my mates. My battery light came on really dimly, gradually got brighter, then i indicated and the gauges all died, car spluttered and i made it into a parking space. My dad met me and juiced up my battery using jump leads for 5 mins. Started my car no problem, drove a few miles and the light was getting brighter again, so stopped and juiced up the battery again.

Tested the alternator today after charging the battery with a good mains charger. Car started fine. Here are the results

Car idling with no accessories or lights on: ~13.5v
Car idling with dipped beam on: ~13.4v
Car idling with blower on full, full beams, brake lights,hazard lights on,but head unit off: 13v, ocassionaly dropping just below.

Weirdly, if I switch the hazards off but put the indicators on, the dash battery light dimly flashes in time to the indicators, but doesnt with the hazards. :-s

Shagged alternator? 13v seems pretty low as in a Saxoit would be running ABS and PAS as well, despite the fact I was running everything at full tilt except the radio.