1996 taurus dead battery

[HOWWHY]

96 taurus bought new battery ran great everyday
for 3 days then sat for 3 days battery went dead
charging system good regulator good diode showed good on vat 40 type tester
pulled neg cable off set voltmeter to 10a and put it between -battery and -cable shows aprox 1/2 amp draw (no lights left on)
whats the problem i cant find anything wrong with it
recharged the battery and will let it sit again for 3 days
anyone have an answer before the 3 days are up

[jonmark1985]

Try checking your amperage again, but this time, unhook your alternator's large wire, and the wires for the regulator. See if you get any dramatic change in current draw.

[HOWWHY]

ok started over read some more of the forum
opened the drivers door waited 40 min check amp draw was 4.07amps
disconnected alt wire from underhood fusebox no change can hardly see
alt let alone regulator wires to disconnect without taking half the car apart
how important is that when the alt was check by a professional machine


why is the amp draw 4.07 with the door open and (no interiorlights on)
then with the door closed yesterday and the draw being half an amp
im an old gm mech fords seam to be difficult to diag.

[HOWWHY]

Ok So I Shut The Door And Check Amp Draw At Battery With Alt Wire Disconnected But Not Reg Wires And Draw Is Down To Half An Amp
None Of This Makes Any Sense

[jonmark1985]

I don't always trust machines that check altenators, until they are on the bench. I don't mean you to take half the car apart, I figured you could get to it pretty easy.