All you'll do with an ignition ballast resistor in the glow plug circuit is melt the resistor. Point type ignition coils draw about 3 or 4 amps...the ballast resistor is sized to provide six volts drop with that much current flow.
The glow plug system draws several tens of amperes (don't remember the actual number off the top of my head - 60 amps comes to mind, but I'm not sure that's right) and will rather quickly overheat a ballast resistor designed for 3 or 4 amps.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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