Electricity is somewhat like water, it only flows from points of high Volts to low Volts. The amount of Amps that flow depends on the difference between the high voltage and the low voltage.
When you're starting the engine, your high Volts are the battery (12 Volts) and your low Volts are at the starter (0 Volts). It is very easy to get 200 Amps to flow when your low voltage is 0. The voltage can never go over 12 Volts because the limiting factor is the battery.
When you're charging the battery, your LOW Volts this time are at the battery (12 Volts). In order to get 200 Amps to flow INTO the battery, the charger has to produce a voltage that is much much much higher than 12 Volts.
Use the boost mode to CHARGE the battery, but turn it off before you hit the glow plugs next time.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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