Running a snow plow on 2005 2500 4x4. Heater worked fine in the morning, went home shutoff truck for 10 min. and started back up. Drove down the road and heater would not work and truck started to overheat. Parked it and returned 2 1/2 hours later and plowed with it. heater would not work but the temp gauge stayed normal the whole time.
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sounds like an ignition switch glitch or ignition harness problem can be either depending on the amount of wear and tear with turning on and off of the ignition tumbler or possible chafing or inconsistent short in harness to ignition switch check the ground line up through harness first and check the wiring harness condition
It sounds like your draining your battery with all the accessories. It could be a loose alternator belt or that the belt is just getting wet and slipping or your alternator is not up to the job!
Try going to a good auto parts store like Advanced Auto and ask them if this could be the problem. They may be able to swap up your alternator to one that can handle the load!