· Horse Power JUNKIE
Have you tried pulling the grid heater relay?
:agree2: that is where they are located.The grid heater relays (two of them) are under the driver's side battery tray mounted on the fender NOT in a box. Trace the grid heater wire back. Only way to disconnect the relays for the grid heater is to disconnect it from the battery terminal or from the grid heater terminals (in the last case make sure to insulate the end with electrical tape so it doesn't short out under the hood). A lot of the time the grid heater relays will arc closed (even temporarily) and cause a loss in voltage in the system. The grid heaters consume aprox 90-100 amps each and your alternator is only capable of MAX 130 amps and even less at idle. I replaced my grid heater relays last fall, they come as a pair on a common bracket so only order one from Dodge if you are ordering. I also found them at a well stocked local parts store, but Dodge was $50 cheaper at $104 for the pair.