You have to be careful what type of test light you use. A test light with an LED bulb will not perform this test very well. The test light has to have a an incandescent bulb. The slightest draw will light an LED. I hate to pump Harbor Freight but I have linked one they offer. Someone may also come along and recommend a volt meter. They have the same problem especially digital ones, it only requires a few milliamps to operate a meter. You do not have to make any special connections to a ground it just can connect between the battery post and the disconnected cable. If this is a cab tractor that has an interior light that comes on when the door is open keep that in mind, that is an immediate false draw. So you may want to figure out which fuse powers that before you unhook the battery. If you determine there is a draw I personally would disconnect all the wires from the alternator as the first disconnect before starting in on fuses. Failing diodes in an alternator causing draws are fairly common.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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