I have a late 60's JD 4020 with 24v system. Now I have replaced the batteries, the starter, and the seliniod but i have nothing at the starter whe I push the start button. The switch and start button test good but there doesn;t seem to be any reation at the starter when I push the button, Any help?

There is a common issue with this year and I have run into it maybe 100 times, The ignition starter switch (located near the bottom top of the steering column) is defective, the switch halves come apart and this causes a no start. Hook a test light up to the fender solenoid, when the key is held in start position the little wire (solenoid signal wire) should light a 12 volt test light, if not you are not getting any power from the ignition starter switch. The switch is very cheap and easy to replace.

Sound like seliniod on starter may be bad....

Replace the starter switch.

Is the lights being on draining the battery, if not then you have two problems, first check the lights, unplug connector from headlight switch and see if that turns lights off, if so then replace the headlight switch, next is the starting if battery is fully charged and nothing happens when key is turned then i would start by checking the starter, with a test light have someone hold the key in the start postion while you test starter, the back of the starter seliniod you will see two connections, one is a big connection with a battery cable going to it, that cable should have power at all times then theres a small connection next ti the big one with a small wire, thats the trigger wire that should have power when key is in the start postion, if theres power to both then replace the starter and thats the starting problem. good day.

The 3010 24v JD system is not a true 24v system. It is a balanced split 12v system, with one positive ground battery and one negative ground battery. The only 24 volt accessory is the starter, where the batteries meet in a series to provide 24 volts for starting. All other accessories are 12v, half powered by the positive ground battery and half powered by the negative battery. The generator charges one battery in one direction and the other battery in the reverse direction. Therefore a 24v alternator is not easily adapted to this system.
The usual solution is to change to a 12v system with an alternator, changing the starter to 12v and changing the polarity of the positive ground battery to negative ground.
The cost of a 12v starter and alternator is far less than the cost of a 24v alternator, plus the added benefit of using 12v lights and other accessories.
JD switched to this 12v type of system with alternator during the 20 series production, but used two 6v batteries in a series due to the larger cranking amp rating of the 6v batteries occupying the same physical space.

Make sure ALL wires are connected properly, check starter.

test the trigger wire for the starter and see if there is signal going to seliniod on start and check distrubutor took you should solve that

the ground cable that goes from the battery to the top bolt in your starter either needs a new end or you need a new cable.

I do not have answer I will like to have an answer for my 316 JD no power no lights on dash battery new and was running shot off and wont stared again.Thank You

yes you need to replace the starter because most likely the seliniod is attached to the starter and you have to buy the whole thing