I am e newbie when it comes to the diesel tractor thing, but I'm wondering why I have the hardest time starting mine. I have a mid 80's G5200H and it's in good shape, needs a little tlc, but I have had it running several times since my friends mom gave it to me. How long should I warm up the glowplugs before I start it? It's spring time here in MIchigan and usually around 60 outside. It seems like I always run the battery down by the time it should fire up. any advice will help.