Re: Current draw through ignition switch

["Paul Irvine" <pi@domain.elided>]

To calculate the current draw of the starter you can measure the resistance
of the motor windings - for SPICA you need to measure the resistance of the
cold start solenoid as well and calculate the parallel resistance which
would be 1/(1/R1 + 1/R2). The current draw is then calculated as
12volts/resistance. For a DC starter motor you need to derate the switch 50%
so multiply the current by 1.5 and get a switch of that rating. This of
course is assuming the absence of any relays which, after all is the point
of the pushbutton starter switch - to simplify the circuit and get rid of
all of the superfluous gadgetry that will inevitably eventually cause
trouble.

Paul Irvine - Antioch CA
Project Alfa - http://home.pcmagic.net/pi

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