Re: Ballest Resister


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Posted by David Sherman [216.18.131.13] on Tuesday, September 15, 2009 at 12:46:16 :

In Reply to: Re: Ballest Resister posted by Robert N. [66.121.52.2] on Tuesday, September 15, 2009 at 09:36:21 :

I think we tend to forget the purpose of the ballast resistor, especially since it's easy to make any given truck run okay with or without it. The point of the resistor is so that the starter switch can bypass it while you're cranking the engine, thus giving more voltage to the coil at a time when a 12 volt battery might only be putting out 8 volts or so due to the load from the starter motor. To use a ballast resistor properly, you would need to wire it up so the current to the coil normally goes through the resistor, but when you're cranking the starter, the coil downstream of the resistor get connected directly to the battery voltage. I've wired them up with the ballast resistor simply in series with the coil all the time, and they generally start fine, but that system doesn't really take advantage of what a ballast resistor system is supposed to do in terms of making it easier to start.



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