Electrical problem
1997 Ford F250 V8 Four Wheel Drive Automatic 137000 miles
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While jump starting my friends car My truck just died. We re started it and it ran till the battery went dead and then died. I have replaced the 2 mega fuses and had the Altenator tested and it tested good. Put it all back together and have the same problem. Whats up with this.

Hook up a voltmeter accross the battery, start it up and see what the readings are, should get 13.8-15 volts, if not check the cables at both ends, you may have a corrosion problem, if cables are good, clean and tight, and readings are low, the alternator or regulator are bad, or a fusible link at the starter solinoid near the battery, the pos(+) cable runs over to it...clean all those connections too. Remove neg(-) cable before working on electrical system and replace it last...