I am having trouble with my truck starting when it is cold unless I plug the block heater in. I have checked the relays the temperature probe and the heaters. The heaters get hot but not glowing red should they glow red or not. I have cleaned the battery cables and all the grounds. I had to fool the temp. probe because it was warm because it would not kick juice to the heaters unless I fooled it into a cool temperature. I am going to check in the morning to each heater to make sure it is getting 12 volts before the relays kicks out. What else could it be if not the heaters. Any help would be appreciated.
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