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Depending upon engine speed, you should be able to run the engine with no power to the plug except to start it. Consistent slow speed running (what these engines are typically doing anyway) needs a glow plug with a bar. The bar keeps the plug from flooding out at low speeds. It may be that low speed with this engine is so low that its not possible to operate the glow plug without power at any achievable speed though.Alan
Yeah, the engine won't run if I disconnect the battery. I've tried it at low and high RPM with no luck.Chuck