The tiny blue spark when you connect a cable is not a good indication of a "draw" as most alternators have an electrical noise suppression capacitor connected to the output stud( Nipondenso) or inside on the rectifier heat sink (10-12 SI Delco)that will cause a tiny spark when first connected, but draw nothing after that. Better as the others say, connect a test light or meter between the bat post and bat cable to check for a continuous draw.
The suggestion to check if the alternator wires (#1-#2 on a Delco alternator, (L and S on a Nipondenso) are reversed is a prime suspect. Another is to check where the alternator wiring crosses the fuel return line to the fuel tank at the top front of the engine. I had this cable rubbing on that line in my 4450 until it wore through the insulation and shorted the two small wires together. It would then discharge the battery in about 1 day.
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