Posted by Steve@Advance on March 12, 2019 at 18:18:59 from (66.169.147.211):
In Reply to: Can a bad alternator posted by flying belgian on March 12, 2019 at 17:54:27:
It can, but so can any thing else that's not turned off, and a bad battery can discharge itself with no external draw.
If this is an old school tractor, pre electronics, you can do the "spark test".
Warning! Only do this in a well ventilated area and not with the battery on a charger!
With everything off, and some charge in the battery, remove one cable, touch the cable to the battery post and watch carefully for a spark. There should not be a spark.
Or connect an incandescent test light between the post and disconnected cable. The light may glow very dimly, preferably not at all.
If there is a spark, or the light glows bright, start by disconnecting the alternator wiring. If the draw stops, the alternator is bad.
If it still has a draw, start disconnecting other accessories, wire harnesses, keep testing between each disconnect until you narrow down the drain.
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