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Power Strokes
7.3 Tech
IDM,PCM Failure?
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[QUOTE="Dave_Nevada, post: 1499726, member: 29749"] If there's a diode installed on the B+ bus to the PCM (CPU in the computer world), then there's a real risk of it popping open (like a fuse) or even worse, fusing closed so there's no protection against an accidental reverse polarity situation. I've seen both. Current on a ground bar/bus behaves like nothing else we're used to, so the sky is the limit in its affect. Since I assume you're an electrician, I want you to imagine someone incorrectly wiring 100 amps on a ground bar in a house. 'Poof' goes anything in it's path. Even MOV (Metal oxide Varistor) components melt in that situation. MOV's protect you against a very fast surge 5 msec or less, not sustained out of spec high current from a battery cable sporting 700+ amps. That nuts to expect it to. And you're right, normally diodes act like a one way valve (gate) in a water system. That is provided you don't over drive their ability to stop a reverse bias to their P/N (Positive/Negative) junction. All bets are off if you do. [/QUOTE]
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