Kubota Electrical Problem

[Rebel_Horseman]

Gentlemen, one of my tractors is a Kubota M4030 and I've been trying to deal with an electrical issue for some time now. The tractor is not getting any juice to the dashboad, and specifiacally the starter key. I can turn the key and nothing happens. Also, the lights and blinkers will not function. I believe the key being in the run position allows the alternator to charge the battery. I say this becasue I can jump the electrical terminals on the starter and the tractor will crank fine, except when I tried to crank it a few days ago and the battery was drained. Once I put my charger on it I got it to crank right off using the same method. Once the tractor is cranked, the key does nothing, and it will even crank if the key is in the off position. I've traced every wire from the battery to the dash and I can't see anythign wrong for the life ofo me. The wire is in split loom but the loom doesn't look damaged or anything. All I can figure is that either my ignition switch is faulty, or I have a relay under the hood that's gone out. Any suggestion will be appreciated.



Brian [><]

 

[Tim1]

Brian, when you jump the starter, I assume you are going from the hot battery side to the solonoid small terminal, correct? The battery cable should run to the dash either directly through a 10 ga. wire or through a relay. Hence, no juice to the dash. I would power the ign switch jumped to battery and work my way back, shoot there isn't that much wire. Tim

 

[Rebel_Horseman]

That's correct Tim. I'm jumping right form the hot wire to the ground on the solenoid. I have a feeling that the relay is the culprit but none of them are labeled to know which is the right one.

 

[barbwire]

What is the term?

Rebel, I forget what the term is, but you know those wires that act like fuse. Is there maybe a chance that you have one of those leading to your switch, That may have burned out? And maybe it is just not real obvious? The coating around such a wire may still be intact.

How old is the tractor? Some times wires corrode inside of the insulation, and is not obvious to external scrutiny.

 

[Pawpaw]

Originally posted by barbwire

Rebel, I forget what the term is, but you know those wires that act like fuse. Is there maybe a chance that you have one of those leading to your switch, That may have burned out? And maybe it is just not real obvious? The coating around such a wire may still be intact.

How old is the tractor? Some times wires corrode inside of the insulation, and is not obvious to external scrutiny.

Fusible link?

 

[barbwire]

Yeah thats the one

Old age settin in

 

[supersonic]

I had the same type of problems with my Kubota G-1900. Turned out to be a bad key switch assy. It should be similar as Kubota likes to reuse little parts, think it was like 28-30 bucks for a new one.