Battery current during engine start
I was a bit curious how much current is pulled during my 5-cylinder diesel start. It's more than I thought. Just before the 8 sec mark the ignition is turned on. The glow plugs pull over 100...
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When the field / armature / solenoid / electromagnetics collapse it puts on a real show on an oscilloscope screen. Measure both the starter motor connection, then on the battery supply voltage of the solenoid connection. Watch for peak inverse voltage as well. A stout avalanche rectifier will greatly mute the battery side hysterics. I've cooked a number of Motorola MR2535 rectifiers doing this on the starter motor side of the solenoid.
A gear-reduction type starter motor significantly reduces peak current cranking amperage) values.
A gear-reduction type starter motor significantly reduces peak current cranking amperage) values.
