I have searched everything I can find to search but can't find an answer. Seems as though most have trouble with glow plugs not working. My problem is just the oposite. I can't get them to stop. At least not with a temperature under 200 F. This truck is new to me. 1984 C3500 6.2L 4 Speed w/ granny low. 4.56 rear. 49,000 miles. The mileage is one of the reasons I bought it. I have replaced the thermostat. Was 160. Now 180. I have replaced both batteries and alternator and 5 or 6 alternator belts. I think the alternator is lined up now. Seems I couldn't get it hot enough to stop the glowplugs from cycling. The glow plugs have an enormous drain on the batteries and alternator (78 amp.). I find that even in 10 degree temperatures at 3200 rpm's it takes at least 45 minutes to get the temp up enough to stop the glow plugs from cycling (pre 180 stat). Just put it in yesterday. Better now but still a problem. Can't seem to get the alternator belt to stop squeeling when the glow plugs continually fire up. Battery is loosing charge. Headlights getting dim. I thought by replacing all that I have the plugs would stop cycling after the engine warmed up. Additionally, the 20 amp guage fuse keeps blowing. Seems to happen after starting when I have had the block heater plugged in the night before. Cruise dosen't work. Was told the previous owner had it disconnected? Clutch seems to be stacking up after repeated use in town. Sounds like a lot of problems and my wife thinks I've bought a money pit but I really like the truck and would like to keep it. If I could determine the causes of these problems and fix them myself I could keep the costs down. Many on this board have helped me with other questions and I hope someone can help me with these.
Thanks
Frank