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The alternator put's out about 9 amps at about 5000RPM, and at idle will be much less -1 to 2 amps at most. Depends on the state of the rotor magnet (they do deteriorate with age, heat and vibration), good connection from alternator through rectifier to battery, and the rotational speed.
The coils will draw around 4 amps when running (averaged out to about 2amps due to dwell angle), and the headlight about 4 amps, with tail light less than 1/2 amp. The battery will be rated about 7 to 9 amp/hours (if it's in really good condition).
So, drawing 6.5 to 7 amps out of the battery, and only putting 1 back in, means drwaing 5.5 or so amps from the battery, which will probably be less than perfect, means the voltage applied to the coils will drop below that required to create a spark good enough to ignite the mixture in the cylinders - engine stop.
My advice:
turn headlight off when idling
if you need to keep the headlight on while idling, raise the idle revs a little (eg 1500 RPM)
if you battery is weak, replace with an Absorbed Glass Mat maintenance-free type, at 9 amp/hour rating.
replace the alternator rotor (magnet)
hope this helps
Pete
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Per Ardua Ad Astra
(Through difficulties to the stars)
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