JD4020 Electrical Issues Resolved...

Joe in IN · Sep 19, 2008

Some of your were curious as to the outcome of the reverse jumping of the batteries.

If you recall I bought two new batteries then had voltage issues(after it started 1 time)...

Some of you said starter or alternator or batteries...

Took it to the shop, ended up being the starter...and the batteries. The batteries were brand new(after the reverse jumping)...

So can a fried starter trash brand new batteries? So the fix-it guy said...

So 2 new batteries and a new starter and it works just fine...

just wanted to follow up for those interested...

JDemaris · Sep 19, 2008

I'm not sure what you're calling a "fried" starter. I guess I don't even know if you've got a grounded 12 volt starter or a groundless 24 volt starter.

With the "24 volt crank - 12 volt neg - 12 volt pos" systems used on some 4020s - the starter was our number one problem. I was sent to many Deere service schools on the issue. Basically, the 24 volt starters lose their isolation after time, usually from damp brush dust inside. When the develop a ground, the charging system cannot work properly. Usually, all that is needed to fix is to take the starter apart and clean out the dust.

Now, if you have a 12 volt system? There's no electronics to fry - maybe you mean the starter solenoid got stuck engaged? If so, it could overheat, cause starter damage, and drain the batteries dead.

In regard to reverse jumping the batteries? It's not going to hurt the starter, at all. If you did it when the batteries were stone dead - and you have a generator on the tractor, reverse jumping wouldn't have hurt anything - except put a heck of a strain on the old batteries.

JD4020 Electrical Issues Resolved...

Joe in IN

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JDemaris

Well-known Member

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