Question about John Deere 4020 Gas & Diesel Tractor Radiator

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4020 w/ 24v system sparks when the battery is connected

On a john deere 4020 w/ a 24 volt split system sparks when the left cable is connected to the battery and makes the wires going to the generator and regulator hot. ??

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  • rjivaro May 11, 2010

    It sounds like you reversed the polarity on one or both batteries. If so, it is possible you damaged the generator and/or regulator so that even if you do connect them correctly you will still have a short. Not neccessarily, but it is possible.

    Get a wiring diagram and make sure they are connected correctly. If the sparking continues it will require further work.


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I usually fix electrical problems by process of elimination. Disconnect the wires attached to generator and touch the battery cable to the battery if it still arcs disconnect the regulator. continue until you find whats pulling current from the battery.

Posted on Jun 05, 2009

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