Disconnect one of the battery cables and connect an unpowered test light that has a real, small incandescent lamp inside (no batteries, no LED, no buzzer, just a simple test light with a low wattage incandescent lamp) in series between the battery cable and the post it was removed from. (Either cable works for this.)
If the test light lights or even glows faintly you have a current draw that is draining the battery.
Disconnect various components one at a time (generator, regulator, ignition coil, light switch, etc., etc., whatever it's equipped with. When the test light goes dark you have found your parasitic draw.
On the other hand, if diagnosing this sort of thing is not your strong suite there's nothing wrong with slipping a battery cable off during while it's sitting unused, or if the "Correct Police" will allow, install a battery disconnect.
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Today's Featured Article - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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