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It was originally designed to protect the electrical system in the event the batteries were hooked up backwards, that entire premise was out the window as soon as the 200A alternator came out, no longer was the alternator going through and protected by the Protection Control Box.What does the Protective Control Box (PCB) really protect? Seems they like to eat glow plugs.
Nothing smart about that, CAMO
It was a noble idea that was poorly implemented, unfortunately because of the military's pressure to make all items compatible from one model to the next the extreme short comings were never addressed, then you add some years and now modification by folks that because they will not take the time to research to the point they understand what is going on and I am not surprised that it is not a bigger issue than it is.