Re: John Deere 4000 - two 6voltsor two 12 volt batterys
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Posted by Gerald on October 09, 1998 at 07:58:38:
In Reply to: John Deere 4000 - two 6voltsor two 12 volt batterys posted by G.Rainey on October 09, 1998 at 00:19:49:
: My J.D. 4000 is a little hard starting when temp. drops down .I currently have it set up with two 6 volts in series to make 12 volts,would two 12 volt batteries hooked in parellel start this tractor better. thanks gr. If the two 6 volt batteries have twice the ampere hour rating of the 12 volts, which they probably would in the same size cases, there should be NO difference. The key to starting is a good set of cables and clean connections. The first thing to suspect when cranking is poor, is that the battery posts are corroded. Modern batteries except the fully sealed ones vent acid fumes around the posts. I've had them EAT the connectors until they broke. Acquire and KEEP a battery post and connector brush. When there's a hint of poor cranking, take the ground connection off first, always, and then take all the rest of the connections off the batteries and polish posts and the insides of connectors until they shine brightly. Then reconnect, doing the ground last. Automotive stores carry spray paints to help preserve the connections but its hard to get it on the bottom side where it would do the most good for the acid fumes. Sometimes grease applied helps protect the connections, but nothing beats cleaning those connections. Why take the ground off first and put it back last? When swinging the wrench on the grounded post the only hazardous place to hit the other end is the positive post. If you work on the positive post first, any thing that's a nearby ground is hazardous. The batteries can supply a couple thousand amps to the wrench which can heat it rapidly. Also the battery heats, the battery creates hydrogen and oxygen and the sparking from the wrench can ignite that mixture spraying battery acid in your face. Once you remove the ground connection the only hazard left on the rest of the posts is the other post on the battery. If clean battery connections don't make it crank well, then its time to check the charging system to see it charges the batteries properly, and that the batteries have adequate water, e.g. they've not been over charged. All the connections in the starter circuit need to be checked next, then the starter itself. Starters do wear brushes and bearings and can lead to poor or no starts. Batteries in series tend to share the load and charging better than batteries in parallel. In either case they should be replaced in matched pairs. Gerald
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