If light comes on and stays on, usually it's the brushes worn out, or a wire has come off the voltage regulator which on most Lucas alternators, is inside the plastic end cover.
Or the voltage reg is ****..
Shouldn't happen after only 12 months though.
Check the brown wires are on the starter solenoid, not fallen off.
If all else fails, pull it off and get it tested at an aulo leccy.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.