My nephew has a F-350 diesel that would drain the batteries overnight. I disconnected one battery and jump started the truck and it ran fine. I went to charge the other battery and it pegged the 10 amp charger and triggered the charger relay big time. I took it to the house and used his charger--same thing. Found out he somehow reverse charged the battery. It had also blown the alternator.
The reason he originally recharged the battery was excess current draw with the ignition off.
I took off the starter cable and measured the current draw across the electronics, auxilliary cable with a digital meter. It showed a current draw of about 3-5 amps that my 30 amp analog current meter (borrowed from tractor supplies) did not show. So I then removed each fuse and measured the current draw across each fuse socket and localized it to one minifuse and left it for him to finish tracing it to whatever relay, device was defective. I forget which one.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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