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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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