Posted by Jon Hagen on February 17, 2014 at 12:32:06 from (69.26.17.61):
In Reply to: Re: 6v to 12v posted by rrlund on February 17, 2014 at 11:23:54:
I do the same. I consider pos ground to be a dangerous oddball in an otherwise 99% 12V neg ground world.
Converting to neg ground eliminates some confusion when charging or jump starting. Also 12V neg ground allows you to use many modern polarity sensitive accessories that have permanent magnet motors or solid state electronics that are almost exclusivly 12V neg ground.
I am also not too keen on using a 6V generator to produce 12V using a 12V regulator. Not only does the 6V generator need more rpm to produce 12V, but the field impedience is wrong and causes more wear and problems with the already troublesome vibrating contact mechanical regulators.
My older tractors are all daily workers, not a parade queen in the bunch, so give me a reliable rotating field generator (alternator) with an accurate reliable solid state regulator built in.
Also, although I have just about given up thinking the public will ever understand,
There is no such thing as a coil with a built in resistor. You cant put a red hot resistor inside an oil filled coil can without having a burst and burn disaster. What some seem to think is a coil with a built in resistor, is actually a coil with a primary winding made from thinner, longer magnet wire that will run on 12V without an external resistor. No internal resistor is ever used, such a coil does not exist.
Your choices are a coil with a 1.5 ohm primary winding, that runs on 6V, or, when series wired with a 1.5 ohm external resistor, can run on 12V. The other option is to use a coil with a 3 ohm primary winding, which does not have any sort of resistor inside, which will run on 12V without the aid of an external resistor.
This post was edited by Jon Hagen at 12:59:06 02/17/14.
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