Posted by andy r on October 27, 2013 at 20:50:43 from (75.91.149.15):
My John Deere 6620 combine had always started easily, but the last 2 or 3 days it has taken a charge with the battery charger and then a boost to start it. Seemed like it was always dead in the morning. It wasn't an immediate concern as I only had a couple of days of harvest left. I thought the alternator was getting weak. The voltage gauge in the cab was showing below normal in the red. The cab fan, header control, all lights, and air conditioner all worked fine. I had even harvested with the lights a few nights. I was prepared to take the alternator in to the repair shop to have it checked. This combine has 2 - 12 volt batteries in parallel. I thought the batteries were newer, but found '03 scratched in the top. So they were older. Fast forward to this afternoon. I had been working in the field and needed to make a repair on the head. When working on the head with everything shut down I heard a hissing sound. Originally I thought it was the radiator or the air conditioning cooling down. I climbed up and looked and found sort of a smoke coming out of the battery vent on the side. Sort of a pungent smell. The battery sides seemed bulged. With this condition I figured that this battery must have internally shorted out????? I unhooked the smoking battery and ran this afternoon with only the other battery. Running with this battery the alternator voltage gauge showed a normal charge. What do you guys think??? What was happening with the smoking/hissing battery??? Guess I will put two new batteries in an see what happens - maybe the alternator is OK afterall. Thanks.
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