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New member here looking for any help I can get.

I tested the battery, key switch, starter/solenoid, and fuses on this mower, and all are perfectly fine. When you turn the key switch to "on" the display screen goes blank and none of the safety switch indicators even show up on the display screen. When turned to "start" there is no click from the solenoid, clunk from the starter, or anything.
I do not have much experience with EFI mowers at all and am completely lost with this.

Thanks,
Nate

Try this. With a fully charged the battery connect your volt meter across the battery and measure voltage. Now try starting the engine. With the key in the start position measure voltage across the battery again. If the th voltage drops below 10.5VDC your battery is bad and needs to be replaced.

Yes, I tried this in hopes that it would be such an easy fix, but the battery tested fine

Now you will have to check each of the safety switches. At least one is not working properly, not allowing current to get from the key switch to the solenoid.

This is what I thought at first, but normally, the screen will still have something displayed. I have 2 other Exmarks, so i went out and tested them, leaving one of the safety switches off each time to see if i could narrow it down that way, but the screen never completely went blank. Would this have anything to do with the RED CPU under the control panel possibly?

First check for blown fuse. Then check that the 12V is present on the "A", "B" and "I" terminals of the ignition switch in the run position.

Terminal A key in off position: 0v
key in on position: 2.2v
key in run position: 0v

Terminal I key in off position: 0v
key in on and run position: 2v

Terminal R key in off position: 0v
key in on and run position: 2v

Then what the "B" voltage in these positions? You have a supplied voltage problem, now just got where it is dropping out and what is causing. Just more troubleshooting ahead.

The "B" voltage is the same as the "I" and "R" voltage.
While testing this though, when I turned the key to "run" i got a faint "click click" from the mower, but it only happened once. I tried turning the key 4 or 5 more times and it didn't happen again.

Okay let's try a voltage drop test. Place one meter lead on the positive battery post (not the cable end) and the other on the "B" terminal and have the switch in run position. You be reading near zero volts. If you get something quite a bit higher then either battery post cable is dirty or the cable is faulty. It also could a faulty ground that is causing the problem which in case you try testing the same way except you test from the negative post to engine crankcase. Again you should find near zero volts. Anything else would indicate a grounding issue.

Meanwhile I'm off to the bank and recycle center this morning.

golfcartNF said:

Terminal A key in off position: 0v
key in on position: 2.2v
key in run position: 0v

Terminal I key in off position: 0v
key in on and run position: 2v

Terminal R key in off position: 0v
key in on and run position: 2v

Click to expand...

Okay so I retested this and found that the guy I had helping me had his probe on the negative terminal while I tested the voltages at the key switch. Here are the correct voltages for the A, I, and R terminals.
A: off - 12.5v
on - 10.5v
run - 12.5v

I: off - 12.5v
on -10.7v
run - 10.7v

R: off - 12.5v
on - 10.5v
run - 10.5v

Something not right about you testing as "A", "I", and "R" all should be ZERO volts in the off position provided you were reference frame ground. And there is a huge voltage drop going here too as if you got a bad connection which hint at by that click click sound and then nothing.

Try explaining what you did to get the last set of voltages.

Finally found the problem with this mower. all it turned out to be was that the wires going into the fuse block were a little loose.

That's why I was about doing a voltage drop from the positive post to the "B' terminal on the ignition switch with in the run position. It should had shown intermittent voltage problem.

But at least you hit on the problem. And yes I have seen fuse holders to give problems which is why I stock a few of the different ones here.

StarTech said:

That's why I was about doing a voltage drop from the positive post to the "B' terminal on the ignition switch with in the run position. It should had shown intermittent voltage problem.

But at least you hit on the problem. And yes I have seen fuse holders to give problems which is why I stock a few of the different ones here.

Click to expand...

Where do you get the fuse blocks for Exmarks? I called my dealer, and he said I would have to buy the whole wire harness, but I don't want to pay $200 for a piece of plastic haha.

I think this is the holder but note no terminals are included.

32160-258​

Now it does look that Aptiv (F56) female terminals are used but not sure as I haven't personally seen this fuse holder.

I had a similar issue with my 2003 Exmark. Turns out the Terminal connector from the engine to the wire harness had degraded causing a bad connection. I was able to buy a ne connector and repin or I could have just spliced the 4 wires. Sounds like you a bad connection somewhere. I think I get a big click if the interlocks are holding me out but not certain from memory.
best of luck

I agree with StarTech, you must have 12v at the B terminal for anything to work. Test at the connector with the connector unplugged from the switch. Not having the wiring diagram for your model, you'll have to back trace from the B wire to the Pos battery. There may be fuses, switches and\or relays in the path. I don't think you have a shorted to ground wire as it would drain the battery, but you may have a pinched open wire.

golfcartNF said:

New member here looking for any help I can get.

I tested the battery, key switch, starter/solenoid, and fuses on this mower, and all are perfectly fine. When you turn the key switch to "on" the display screen goes blank and none of the safety switch indicators even show up on the display screen. When turned to "start" there is no click from the solenoid, clunk from the starter, or anything.
I do not have much experience with EFI mowers at all and am completely lost with this.

Thanks,
Nate

Click to expand...

For what it is worth, I had this same issue with my LS4041 utility tractor. Tried everything over a period of 10 days, even bought a new starter for it ($450). Every time I turned the switch on, all indicators went blank and no starting noise. Turns out, that when I recently bought a new battery I thought I should replace the corroded battery cable connectors and I bought some cheap ones at the auto store off the rack. Ordered new connectors and replaced the battery cables at the same time. Fixed all my problems for $30. When I bought the cheap ones at the auto store I thought to myself "these don't feel right but they are brand new." The old saying still applies, check your pecker tracks.

Connect a known Good Battery to the Starter. + cable to big lug on Starter, Last connection to good Ground on Frame. Starter should rotate. Perhaps try jumpers on all 'safety' switches (3-4).