ok the truck is a 1986 M1009 diesel, and ive noticed that starting in cold weather is a bear. it cranks and cranks and i have to press the gas pedal down to get it to fire. heres the thing, i always turn the key to "on" and wait a good 10-20 seconds before cranking the engine, but i never see the "wait" light. then today, i go to start the truck, see the wait light and wait for it to turn off. crank the engine and it fires right up. so i guess im wondering if this could be a glow plug relay problem. like an intermittant electrical problem. i thought it just had the original glow plugs and they werent doing the job anymore, but after today with the wait light working and then the truck firing up after two, maybe three cranks, im thinking the problem is something else. any ideas?