No resistor on those engines and they are hooked in parallel. In other words, hooking one directly to a 12 volt battery would not hurt it. However, high voltage like having a booster charger on it will fry them in seconds. Never exceed normal regulated voltage which would be about 14.5 volts. Even that high is not good. What I do on all those style glow plug engines is keep them on while cranking and after starting but do not let go of them and then reapply. The original generators did not have enough output to raise voltage to regulated voltage while holding glow plugs but once you let go then the voltage will rise. With an alternator you could very well reach regulated voltage even with glow plugs on. So, if you have correct plugs, only high voltage would blow them.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that�s wha
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