Army;
It's science, but not rocket science...so you can make an informed judgement call (much as the vehicle elec eng would have)...for instance I'd consider the modest current of Directional Indicators and Wipers as somewhere between Continuous, and Intermittent, so weigh them at 50%...High current of Fog or Driving lights, I'd weigh (for the purpose of Charging System sizing) at 80-90%...I'd add in Brake Lights at 20%...again you're making a bit of an academic exercise of this, but the 60A Alt will serve you well. Remember also, that the rated output of Alt is used only when called for...at other times, it is just available and on stand-by, and trickle-charging the Bat.
Cheers
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