Battery voltage drops to 5V with negative connected on a Ford Edge

Dan the man said

Leave the negative cable on the battery. Remove the positive cable and with a test light put one probe on the battery post and the other on the cable if the test light lights up there is a short, and finding that on a modern vehicle will be a nightmare to say the least.

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Just start unplugging stuff. PCM first. My 2012 Caravan starter was shot. We took it in and the Kragen tester said it was good. Well, I knew it wasn't so I bought the rebuilt and we put it on the tester and it tested good too but it actually shot out with some force, unlike the old one. Ill take it! Put it in and off to the races......