Re: 7.3l brand new Alternator tests good but won't charge in truck.
check your fuses, there will be one that says alternator or generator
Is the battery light on in the dash?
The ford alternator has a built in voltage regulator that must get power from the dash or your good alternator will not charge
The fuse is on the power side of the voltage regulator
1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, RSK
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2001 Excursion 7.3, auto, 4x4, 3.73, freight train family hauler, collecting parts for suspension lift
2000 E350 7.3, auto 2wd, 3.73, toy hauler camper conversion...researching 4x conversion
SEVEN POINT THREE LEAKER