Posted by mEl on February 01, 2009 at 13:07:40 from (75.104.128.38):
In Reply to: Re: positive ground posted by fixerupper on February 01, 2009 at 10:45:44:
I believe the reason most components are now being controlled from the ground side is to protect the computers or controllers that activate them. Most are controlled by relays and those are equipped with a diode across the coil to quench the induced voltage generated when the magnetic field collapses across the that coil. That is why in newer equipment it is dangerous to substitute relays unless one is sure the substitute is identical electrically. Nothing like flashing a $500.00 controller with an induced current when the device is turned off and the relay opens. Hope others add to this discussion. mEl KC3EH
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