Quote:
Originally Posted by YellowK5
if your truck has a generator it wont care. But alternators have diodes inside of them. They can blow if you pull a power cable while it is running
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That's exactly right. Additionally, the alternator may still work, but the diode(s) could be what we call "walking wounded" in the electronics industry, and simply fail later, at a really inopportune time. One might get lucky doing this, but if a rebuilt alternator is taken in for warranty work and diodes are popped, there will be no warranty on the thing. Popped diodes are a clear indication that the battery cable was pulled while the engine was running. Take it to a qualified mechanic. Note that not all persons calling themselves mechanics means that they are qualified, btw.