Originally Posted by sergey
My local Triumph service has finally been able to diagnose the issue, and the problem was: faulty starter drew 180 AMPS when hot.....
Wow - now that would certainly do it
A fairly simple test to see if same problem would be to check voltage across battery when hot, with lights on - if not sagging significantly under 10A load from lights & is measuring over 12V still, measure voltage again while cranking - normal sag while cranking should be in the order of 11.0V with a well-charged battery.
Of course if battery is not fully charged it will sag further, even if starter is normal - the key would be how much it sags with just the lights
Compare your hot & cold voltages for these conditions:
Resting (off); lights/ign on & cranking
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