Really great point, David. A thorough understanding of systems including all system components is really needed to even begin a logical approach to troubleshooting.
Often, us armchair mechanics sitting at a keyboard lack the details needed to provide meaningful troubleshooting assistance. But we don't let that stop us from trying to help based upon our own assumptions, past experiences and misunderstandings.
Even with all that stacked against us, once in a great while, one of us gets it right. So now, we each secretly want to be that next guy to be able to 'ring the bell'. We mean well...
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