You're on the right track testing for drain with the test light. A volt meter is going to show volts even with a minimal draw, as in the memory circuits in the radio, ECM, etc.
If you want to attach a number to it, you will need a DC amp meter, connected just as you connect the test light.
I'm wondering if something is interlocking and causing the drain. The interlocked load remains until you disconnect the battery cable to connect the test light, that breaks the circuit, the load goes away, so you get a false test with the light.
Something to try, connect the battery, start it up, drive it, shut it off. Then in a dark area,carefully watch as you pull the battery cable and see if there is a one time spark. If there is a underhood light, disconnect it before you start this test.
If you do have access to a DC amp meter, do the above test, but have the amp meter leads connected BEFORE you break the battery connection so the amp meter will carry the uninterrupted load.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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