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More JD4020 Electrical Issues

J

Joe in IN

Member
When I turn the key on, voltage on the batteries drop to zero. This is without pressing the start button or anything. No lights on. Just turn the key, no idiot lights appear, but volts drop to zero on batteries(2 new ones)..

Not sure what to do...check every wire on tractor? call someone to come get. Any thoughts?
 
Check the voltage at each battery, from POST to POST, with a voltmeter.

Most likely, the voltage will stay up to about 12.5 Volts.

Then, check between the terminal CLAMPS at each battery to see if the clamps are making contact with the battery posts.
If OK that far, you probably have a bad cable(s), where the conductor is not making contact with the end terminal(s).

Having witnessed several battery explosions over the years, I wear appropriate eye protection when working around batteries, and suggest you do, as well,
 
Did an Ohm's check on cable's, have 2 new ones(positive's), the negatives are good, I cleaned up the connections to make sure the grounds were good.

Same voltage from term to term as from solenoid to chasis ground. When key is turned on...it drops like a rock...
 
You CAN'T check battery cables with an Ohmmeter. (At least not in a useful manner.)

Obviously, there's a bad connection that conducts well enough to make you happy with what you see on the Ohmmeter, but won't carry enough current to crank the engine.

One or more of the cable ends is not making good contact with the conductor inside the cable.
 
Had a 730D 24 volt do that once. Ended up one of the solder on cable ends was not soldered on good, showed voltage, but put on a load and lost the voltage. the cable was end was stuck enough that it did not fall off, but not enough to get hot.
 
Purchase a "bargin basement" multi-meter and simply perform voltage drop checks on all of the cabling and connections until you find the culprit/s..................VERY easy to do............unless of course you've already done so............
 
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