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 - Talk of the Town: Trailerin a Tractor, Chains or Straps? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: " I bought a trailer and plan to take my CASE VAS to some shows. I don't yet have anything to secure it to the trailer. So which is better to buy and use; the ratchet-type straps or binders and binder chains?
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