john deere 790 electric

[jimdocsr]

i have a fully charged battery. Good connections, juice at the starter and fuel solenoid. No lights, indicator lights on dash and will not click or turnover. It as if a relay is stuck or the ignition switch is bad. Any ideas

Update- This morning I went to the tractor and turned on the keys and my indicator lights came on. I jumped up on the seat - put it n neutral, depressed clutch and turned the key. All I got was one loud click. Turned it again and got the same single click. The third time my lights were off, no click and all dark as described above.

 

[Spanner]

Ign. sw. 'could' be bad. Also there're a lot of fuses in the fuse box...

 

[crashz]

My 770 would bounce around enough for the seat switch to fall out of place. I tend to forget the PTO safety switch too.

 

[Dave M7040]

Invest less than $10 in a 12 volt test light.

With this tool you can explore for blown fuses. The test light, with the alligator clip on the battery negative terminal, is touched to both ends of the fuse while it is in place. If the test light illuminates on one end and not the other the fuse is blown.

If you have a wiring diagram plse post it so I can look for how the safety switches are handled. Some are just wired in series but other tractors use a controller.


Next, read this carefully:


What I am about to suggest bypasses all safety switches and must be done with great care starting with someone on the tractor with a foot on the brake and gear selector in neutral.

If you have a mower deck be certain it is in the off position and your feet well away.

Make up a short piece of 14 or 16 gauge wire with a slip on terminal on one end.

Remove the plug in small wire connection on the starter. Plug on your wire on the starter terminal, turn the ignition key to on. Touch your small wire to the battery terminal on the starter. The engine should turn over and likely start. Remove your wire immediately. You can leave it on to start the tractor but just knowing it will turn over is enough to establish the starter works.

There may be a few small sparks as you do this but no problem if this happens.

Come back after getting a test light and doing this jump the starter bit. Be extra careful as people can be injured or killed by a run a way tractor.

Dave M7040

 

[jimdocsr]

checked all fuses-all good.
is there a relay you know of or now based on my updated thread . Could it be a shorted starter? If so why do my indicator lights go dark?

 

[jimdocsr]

please review my updated thread.

 

[k0ua]

It "could" be a lot of things. What you have to do is take a voltmeter and an assistant and start at the battery posts. Take a measurement on the battery posts. NOT the battery terminals, but the battery posts. Have the assistant attempt to start the tractor. What does the voltmeter read before and after the test? Form a hypothesis from the data you just gathered. Move out to the battery terminals, and perform the test. Form a hypothesis from the data gathered from the test. Move out to the other ends of the battery cables, namely the ground lug to the chassis and the starter solenoid input bolt. Perform the test and once again, decide on you hypothesis. Do you see where I am headed with this? This is NOT rocket science.. Simple tests and simple ideas. It amazes me that people always think because a tractor doesn't start, it must be some sort of starter failure. The starter is about number 30 on a list of problems why a tractor will not start. Way up on that list is the battery itself, the battery to terminal connections, the terminal to battery cable connections, the battery cables themselves, the ground lug bolt, etc. etc. ALL of these things are far far far more likely to cause a tractor not to start than a defective starter. There are literally hundreds if not thousands of "my tractor wont start" threads here on TBN. and the results are nearly always the same. Come to think of it, I can't remember a single defective starter in hundreds of these threads. Good luck.

 

[Dave M7040]

Take the negative battery cable off the frame or engine.

Polish both the frame and cable end as it sounds like you have a connection which cannot pass lots of aamps.

Dave M7040

 

[jimdocsr]

I followed your instructions - Unplugged solenoid on starter(small wire) inserted slip connecter with wire into slot on solenoid (starter) -tractor neutral key on (no lights on dash) touched starter battery terminal and nothing happened. Turned key to start and touched starter- Nothing happened.

Tested wire jumper with key on and it had juice while plugged into small wire connection- tested starter lug from battery and it had juice.

If its the starter why are my dash lights not on when the key is on. They always are. I have no running lights-or headlights either.

 

[jimdocsr]

installed new battery and terminals- tested with battery analyzer battery real good. - get juice to starter. I an try and come off battery direct to starter lug