1999 Ford Taurus car only runs if booster box attached

1999 FORD TAURUS
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DREWPIGEON
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Electrical problem
1999 Ford Taurus 6 cyl 100000 miles

Replaced battery, alternator, starter, battery saver relay, and module on alternator (double checked all at auto zone). Car will not hold charge or run unless booster box is attached to battery, as soon as I take it off it dies, immediatly. Any ideas please.
Dec 8, 2009 at 9:20 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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