My Ford has dual alternators, 1-200 and 1 150 amp.
At start up in the Winter, I am drawing well over 200 amps.The supplemental heater is 1200 watts(120 amps), glow plugs, two seat heaters, air compressor, head lights, plus the other 25 lights or more if trailer and camper are hooked up, and the draw that all the 12 volt and 120 volt outlets have, stereo and other things I forgot.