Question about John Deere 4020 Gas & Diesel Tractor Radiator

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Have a 4020 with a 24 volt starter on it. The starter went bad and I had to replace. Shop sent me a new one that doesn't have the isolated ground post for the positive ground. They said to hook the wire to the mounting bolts on the starter. I don't think this will work will it?

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Posted on Jan 02, 2017

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SOURCE: I have a 3010 John Deere +24 volt pos ground how

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.

Posted on Feb 17, 2011

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

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

nova2nv
  • 197 Answers

SOURCE: john deere 318 wiring diagram I replaced an bg 316

Purple wire goes to the solenoid on starter.If you installed starter with single wire post all you have to do is mount a solenoid to the frame just in front of starter,existing batt/starter cable goes to one solenoid post,purchase a short red cable and install on other solenoid post and run it to the starter,plug purple wire into new solenoid and the way you go.

Posted on Nov 16, 2009

Testimonial: "This was great advise bought a solenoid and away i go thx"

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3 Answers

I just replaced the starter in my car and it still just clicks what would my issue be


Check positive and ground cables first. Clean any corrosion, replace if it is bad. Could also have bought a bad,new starter.

Feb 04, 2015 | Cars & Trucks

1 Answer

Truck will not start


Best thing to do. Take the starter to a shop to test for you if it's good or not.
-If not good, replace it
If good then do the following:

Q: Can you turn on the head light and horn?
A: Yes.
-Okay check all connectors from battery to starter must be good connect (tight). If not tight it.
A: Yes all tight.
-Now hook up a volt meter to the end of the cable at starter and ground. Any voltage ?
A: No.>>> It's bad cable (Due to corrosion)
Yes. there is 12 volts there.>>>The wire to the starter solenoid
is either bad connect or not connect. If so connect it.

Q: What is the solenoid?
A: This is mechanic language ( It is a small motor that attach to the stater)

-Yes that wire is connect good.
-Okay. it connect good but still can't start. Now unplug that wire and hook up the volt meter to the wire and turn the key to start .
You should have 12 volts there. If not Check fuse and relay.

Mai Lor

Feb 24, 2013 | 2000 Ford Expedition

1 Answer

1988 Winnebago, not charging at all.


If it is just the chassis battery that is not charging, then the battery isolators if bad. Check the output at the back of the alternator and if it is puttin out, then the problem should be at the battery isolator which is somewhere on the vehicle (most likely under the hood). Follow the alternator output and it will go to the battery isolator. At the battery isolator the lead coming from the alternator should read at least 13.5-14.5 volts and if it does, then check the other two leads coming off of the isolator and they should also read the same. The two leads coming off of the isolator should each go to a different battery and they both should read the same but if not then the isolator is bad. If the two leads coming off the isolator do read 13.5-14.5 volts, then there is a problem between the isolator wiring and the battery somewhere. Check the battery to engine ground, engine to chassis grounds and make sure that they are good. The chassis battery is more than likely a chassis ground so make sure that is has a clean connection. Coming off of the starter solenoid are several fusible links and they could be open(blown). There could also be other fusible links on the vehicle so check around the starter and along the wiring harness. Check the harness for frayed/broken/corroded/ or discolored wires as they can cause problems. If the charging system is working the batteries do not need to be new in order to read the correct charging voltage.

Aug 06, 2012 | Ford Cars & Trucks

1 Answer

I have a international 127 cub cadet and replaced the coil with a 12 volt internale reg coil but still have not spark points look good


You need to isolate the coil by removing the ground wire from it and then trying for spark. If you can get spark without the ground wire attached, then your coil is good and you have an electrical short to ground somewhere in the machine, such as a bad on/off switch or some other thing you'll have to determine; which can be difficult. Best of luck to you.

Nov 12, 2011 | Garden

3 Answers

I have a 97 isuzu rodeo, starter just clicks, had this problem before and i adjusted the neutral switch and it started, now it doesn't start even after adjustment. how can i know if the neutral switch...


This may actually be a problem with the starter solenoid and not the neutral safety switch. If when you try to start the vehicle and you are only getting a clicking, then I would replace the starter solenoid which is typically found on the passenger side firewall. If not there, then on the starter itself.

Oct 21, 2011 | 1997 Isuzu Rodeo

1 Answer

P0120 P0220 faults on a 03 Avalanche. First went into reduced power mode. Cleared faults. Truck still will not go over 35 mph. Did not trip the check engine light.


this is an obd2 trouble code table, it can help you understand the meaning of code.
for p0120,
the possible solutions:
If you have access to a scan tool, with KOEO (Key on engine off) observe the TPS voltage. With throttle closed, voltage should be about .45 volts. It should gradually sweep upwards to approximately 4.5 to 5 volts as you depress the throttle. Sometimes only a scope can capture an intermittent glitch in the TPS signal voltage. If you notice a glitch in the TPS sweep voltage, replace the TPS.
NOTE: Some TPS sensors require fine adjustment. If you aren't comfortable with using a DVOM (Digital Volt Ohm meter) to adjust the new TPS, then it's best to take the vehicle to a shop. If the voltage is not .45 volts (+or- .3 volts or so) with the throttle closed or if the reading is "stuck" then unplug the TPS connector. With KOEO check for 5 volts reference voltage present at the connector and a good ground. You can check the signal circuit for continuity by jumping a fused wire between the ground circuit of the TPS connector and the signal circuit. If the TPS reading on the scan tool now reads zero, then replace the TPS. However if that doesn't change the reading to zero, then check for an open or a short on the signal wire and if none is found, suspect a bad PCM. If manipulating the TPS wiring harness causes any change in idle, then suspect bad TPS.

Jul 20, 2011 | Chevrolet Avalanche Cars & Trucks

1 Answer

1988 460 motorhome starting problem


When its hooked up, you should be able to put 12 volts on the little stud on the solenoid and it should start. One large stud will have 12 volts on it, so just jump it right there. Did you get the wires in the right place. The solenoid should have 1 large wire going down to the starter. Be sure the battery cables are clean and tight ( both ends) Check battery voltage when cranking, should go to 10-11 volts. Check voltage between negative terminal on battery and engine, should be ZERO when cranking. The solenoid has 2 large studs, make sure the battery positive wire and all the other wires are hooked to this stud, the other large stud should just have the wire going to the starter.

Jan 23, 2010 | Ford E-350 Cars & Trucks

2 Answers

Chrysler 2004 starter doesn,t turn ,battery has 12.7 volts lights and horn works good but starter doesn't even click


My 2004 Sebring did just that. it was a fusible link. a tiny square box in there with the fuses. they are a cube that plugs in about 3/8" of an inch square. Find the bad one replace it and the starter starts working again.

Sep 08, 2009 | 2004 Chrysler Sebring

1 Answer

Went to body shop for a week. Now wont start, they


Bad battery or starter connections ? Bad ground ?Or they installed a faulty starter, you are not missing anything i can think of.

Aug 13, 2009 | 1998 Dodge Ram 1500 4WD

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