Another great case study by Bob in Massachusetts, this time related to a 2011 F-250 no crank situation that had already had its battery and starter motor replaced before it got to him. As he described it, “At key on, the dashboard lights up but when turning the key to crank, there is a faint click and then everything goes dark.” After checking the battery, which tested good, he headed off on his diagnostic adventure.
He immediately started voltage drop testing various aspects of the starting/charging system, in search of the root cause of the issue. It didn’t take long before he started zeroing in on the issue. By his second test, he was able to determine that voltage at the starter during an attempted crank “saw a drop to almost zero volts.” It was then just a matter of time, and a few more tests, before he identified the source of the problem.
This case study is very clearly presented, well documented and follows the diagnostic path from start to finish. As one commentator noted, “Your case studies are always so well written and easy to understand. You are a fantastic teacher!” We couldn’t agree more. This is a great one to share with new techs in the shop or anyone who is developing their electrical system diagnostic skills.
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