charging issues help please

[shockedmustang]

I have a 2008 3 door hatch im having a weird issue with the charging system. On the way home from a small trip it stopped charging lights went off radio shut down and the heater shut down. But the battery light never came on but I checked it with a dmm and it showed 10 volts. The next day I charged the battery and replaced the alternator. 2 days later it happened again . So I thought the new alternator was defective and replaced it again. same thing just stopped charging on the way home from a short trip. But something different this time I hit a bump and it started charging all of a sudden. So i checked the alternator wires all of them were tight I also checked the battery cables all tight.I even checked the wire that connects the battery to the body next to the battery it was tight also I even ran a ground from the alternator bracket to the battery and a positive cable from the alternator charging post to the battery also . I checked the fusible link on top of the battery they are both intact I'm at a lose as what to check next any idea would be very helpful thanks in advance Joe