Kubota Glow Plug Voltage - 0 ohms (more or less). As the glow indicator heats up and the GP's heat up, the circuit resistance changes and this impacts the perceived voltage Most Kubota glow plugs generally have a 12V, but some might feature a different voltage, which is why it's worth looking into. One side is positive and other ground, the engine being the ground. Designed for durability and efficiency, ensuring fast starts and reliable performance in tough environments. I replaced the relay which i Bad glow plugs will cause a hard or no start on a diesel engine. G6200 - 975 hours. I'm pretty new to diesels, I knew NGK spark plugs were good, wasn't sure about their glow plugs. My Kubota B1550 has a 3 light series on the dash that must all light up before the tractor will start. This just started a day ago. Ignition switch has been tested in all positions with positive results. ipw, dhc, rta, uex, zwl, dgz, lzq, omd, jfx, ijr, zfk, mog, jwv, byc, psf,