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Using a SPST switch to control both the alternator field and

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schu(at)schu.net
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Posted: Sun Jan 31, 2010 2:51 pm Post subject: Using a SPST switch to control both the alternator field and

List,



I have a switch that I really like that I want to use for the main

switch.  It's a heavy duty switch that can handle up to 75amp, but it's

only a SPST switch.



The diagrams in the Aeroelectric connection show a DPST switch for the

master because it turns off the alternator field coil.  This leads me to

ask two questions:



1.  Does the field coil need to be turned off?  If it's wired directly

to the main power bus then the second the master switch is turned off

the contactor isolates the main buss anyway causing the field coil to

shut down.



2.  If it's harmful to have the field coil wired to the main power buss

without a way to isolate it, then can I wire my main power switch as

shown in the attached drawing?  Other than a little more wire, is there

anything wrong with doing it this way?



Thanks,

schu

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