Looks like you got a new regulator a couple of months ago. I assume that did not fix the problem? I can tell you that 3.5 mA will not drain a battery. Even a weak battery should not be drained by 3.5 mA. What eveidence do you have that the battery is actually draining at all? It appears you have eveidence that the battery is NOT draining at all. So you have some other problem not related to the battery. Is the symptom still car won't start and check engine light on?

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra