Tach, hour meter not working

[Diego]

I’m new to this forum. A little background, I have a 2008 Kubota BX24 that has been the backbone of my yard work. I cleared about an acre of forest with this little beast, digging up stumps with the backhoe dragging them out with the backhoe while doing a wheelie. Anyway, can’t say enough about this tractor!! In 2018 my tractor ended up under 5 feet of water during hurricane Florence. I was able to bring her back from the dead and still running strong. Needless to say, the lcd, rpm and hour meter stopped working in 2018. Recently I’ve had issues with the temp meter running hot. Last week the temp gauge froze just short of overheating. I replaced the thermal sensor and the instrument panel. Temps have been good, mowed for 3 hours today never got over half hot. My issue is with the tach and hour meter, they are not registering at all. I have figured out the hour meter and tach run off the alternator. I haven’t needed the tach and hour meter for the last 6 years but they are there and would like them to work. Any assistance would be appreciated. I have the WSM that I have to look at more closely. Initially it doesn’t give a specified voltage that should be coming off the pin that supposed to go to the tach/hour meter. Is it variable? There is voltage, I just haven’t tested at different rpm’s. I

 

[GreensvilleJay]

Assuming the alternator is similar to the BX23S, the 'tach signal' IS a variable stream of pulses which you cannot read with a DVM, DMM or VOM. The higher the RPM, the more pulses you get. You'll need an oscilloscope to actually see them.
Hmm, did you replace the alternator after the Flo event ? If not, it is possible that the 'tach signal' section of the alternator is bad, yet the alternator can recharge the battery.
It'd be great if you could add the wiring diagram into the 'electrical' section here.
Also, was the entire wiring harness(es) replaced ? water and copper wires do not 'play well' together !!!

I had a CJ-5 that went into a creek, it took 7 months for 'weird stuff' to happen...fortunately that was 3 months AFTER I'd traded it in on a new ride.

 

[Diego]

Assuming the alternator is similar to the BX23S, the 'tach signal' IS a variable stream of pulses which you cannot read with a DVM, DMM or VOM. The higher the RPM, the more pulses you get. You'll

need an oscilloscope to actually see them.
Hmm, did you replace the alternator after the Flo event ? If not, it is possible that the 'tach signal' section of the alternator is bad, yet the alternator can recharge the battery.
It'd be great if you could add the wiring diagram into the 'electrical' section here.
Also, was the entire wiring harness(es) replaced ? water and copper wires do not 'play well' together !!!

I had a CJ-5 that went into a creek, it took 7 months for 'weird stuff' to happen...fortunately that was 3 months AFTER I'd traded it in on a new ride.

Yes, I had replaced the alternator. I figured the lcd had stopped work due to the water. I have not replaced the entire wiring harness. Here are some of the diagrams and instructions for testing the circuit. But it doesn’t state the voltage coming off the hour meter/tach pin.