Kubota B7800 engine shut down - no power: Kubota Review  -- Kubota Tractors Discussion Forum and Review Kubota B7800 engine shut down - no power: Kubota Review -- Kubota Tractors Discussion Forum

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 04-06-2013, 13:32 Post: 186595
mbailey



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 Kubota B7800 engine shut down - no power

just installed the alternator upgrade kit. started tractor and ran about one minute before it just stopped running. went to restart and now there is no power to instrument panel. absolutely no electric. battery is brand new. power is showing at starter and alternator contacts. no fuses are blown (50 amp slow blow on new alt wire kit and all fuses on right side main board). checked seat switch, no pto's engaged. Anyone come across this issue.






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 04-06-2013, 21:21 Post: 186601
kthompson



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 Kubota B7800 engine shut down - no power

That sure seems about the time needed to burn a wire or circuit out. Are you certain nothing was wired wrong? I am not familiar with the upgrade.






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 04-06-2013, 21:38 Post: 186604
mbailey



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 Kubota B7800 engine shut down - no power

I don't think so, upgrade is pretty straight forward. coincidentally my buddy was using the tractor a couple of days before and he said the battery was dead. when I picked up the upgrade kit, I also picked up a new battery. did a battery check on old battery and its fine under test load. I still put the new battery in anyway and when I went to start it after installing the upgrade kit I noticed that it cranked slowly, and got weaker as it craked, exactly like a weak battery. It's got to be related. I think I'm gonna have to bite the bullet and call in a pro for this one!! thanks for the response though, much appreciated.






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 04-07-2013, 19:08 Post: 186607
Art White



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 Kubota B7800 engine shut down - no power


There is more then one problem. I'd doubt that you have two batteries that have a bad cell but the old one still might.
The starter might be drawing more then it should but that can be checked.
The dash might be the ignition switch but it also might be the cranking problem. To not have it start when cranking, then there is a problem with the fuel shut off or power to it.






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 04-08-2013, 07:36 Post: 186608
Murf



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 Kubota B7800 engine shut down - no power

It doesn't say if the tractor cranked on restart attempt, did it?

I think Art is on the right track though. The dash and fuel shut off solenoid are tied together.

I suspect you just missed noticing that the dash went dead at the same time it stopped. The stop would certainly be as you described if the fuel shut off solenoid lost power.

I would recheck all wires that were involved in the alternator changeover.

Best of luck.






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 04-08-2013, 23:34 Post: 186614
mbailey



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 Kubota B7800 engine shut down - no power

UPDATE...found the problem. rechecked all wiring and when I unwrapped the original wiring harness that goes from the dash to the starter/alternator I found the red power wire was fed into a plastic connector, with the red wire feeding out of the plastic connector on the other pole and then out to the starter. Inside the connector was a little aligator clip jump from one pole to the other!! (loose by the way) I have no idea what the previous owner was doing or even thinking about when he wrapped this cluster #$&* up. Regardless, cut out the connector reconnected wire properly and presto, lights to the dash and cranked like a spring chicken. On a proud note, the alternator upgrade works great. Highly recommended for anyone who is tired of the brake lights used for headlights feature!! kubota engineers dropped ball on that one!
Thanks for the input everyone, love this website. a lot of great insight from real tractor heads






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Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

Thread 186595 Filter by Poster:
Art White 1 | kthompson 1 | mbailey 3 | Murf 1 |

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