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 - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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