Ongoing BX Electrical Saga

   / Ongoing BX Electrical Saga #1  

Tom_H

Veteran Member
Joined
Mar 27, 2004
Messages
2,457
Location
20 mi SE of Sacramento, CA-rural
Tractor
Kubota BX2200
As I posted previously, after getting the Woods backhoe purchased and mounted, the tractor immediately began blowing the fuse that controlled fuel guage, temp. guage, glow plugs, turn signals, and headlights. New fuses blew instantly. I couldn't find the problem and finally took the BX2200 to the shop.

They diagnosed it as a bad voltage regulator. I got the tractor back and ran it for about 10 hours. That same fuse blew again. I discovered the 15 amp fuse had been replaced with a 25 amp fuse. I tried replacing it with a good 25 and that blew right away.

Since I was in the middle of a big project, excavating brown stone material from backyard paths so paved walkways could be put in, and moving the old material out into the woods to construct a new woodland trail, I kept on using the tractor. The same 5 things were out, but it would start and run. I thought I'd get the paths done and then this year's weeds brush hogged, then take her back in. I did get all the old paths excavated and moved about 10 yd3 of crushed stone into place between the forms for the concrete mud to be poured onto, along with some trenches dug with bh for some drain lines. During all this the battery died, but it was 3 y.o. I replaced it and the new one had no problems, so don't think that was related to all the other elec. problems.

The concrete trucks arrived Mon. a.m. I had offered the tractor to carry the mud, but they had a pumper. I did start out, however, using the FEL to deliver 80 lb. bags of pebbles every 8 feet that would be used to "seed" the surface for an exposed aggregate look.

After delivering a particular bucket load of bags, I tried to start up, but the engine started knocking as if running out of fuel. I put more in, but fuel never seemed to get to the cylinders. I took both filters off, each was clean as a whistle: I could blow through each and fuel rushed through each. The little nut valve downstream of the second filter had not been touched.

I talked with the svc. mgr. @ local dealer, who had me check the solenoid. The thing did not make an audible click when turning to the start position, but did click when going from run position (though not running) back to stop. I had no way to get the tractor on trailer so he decided he'd send a technician in a day or so when he could spare one.

The next a.m., it did manage to knock on 8 or so strokes with partial combustion, then emitted smoke for a few more seconds while attempting to start. Then no smoke, just the starter futilely turning.

The technician came this a.m. (Fri.) and could not diagnose anything other than the problem being electrical in nature. He did bypass the entire fuse system with a 7 amp in line fuse to the injector pump and started it and got it on his trailer.

Any theories, observations, past experiences?

Thanks guys.
 
   / Ongoing BX Electrical Saga #2  
Tom_H said:
They diagnosed it as a bad voltage regulator. I got the tractor back and ran it for about 10 hours. That same fuse blew again. I discovered the 15 amp fuse had been replaced with a 25 amp fuse. I tried replacing it with a good 25 and that blew right away.

The technician came this a.m. (Fri.) and could not diagnose anything other than the problem being electrical in nature. He did bypass the entire fuse system with a 7 amp in line fuse to the injector pump and started it and got it on his trailer.

Any theories, observations, past experiences?

Thanks guys.

My theory is that your dealer didn't have a clue the first time and risked frying your tractor with a fuse that was 10A higher than specified. Additional electrical parts from battery to alternator to solenoid, wires, etc. may have been damaged since. It's one thing to do a short test with a higher amperage fuse but leaving it in there with the hope that it "makes the problem go away" isn't the answer.

Call them up and ask for a better mechanic this time or find another dealer.
 
   / Ongoing BX Electrical Saga #3  
slewisma said:
My theory is that your dealer didn't have a clue the first time and risked frying your tractor with a fuse that was 10A higher than specified. Additional electrical parts from battery to alternator to solenoid, wires, etc. may have been damaged since. It's one thing to do a short test with a higher amperage fuse but leaving it in there with the hope that it "makes the problem go away" isn't the answer.

Call them up and ask for a better mechanic this time or find another dealer.

Tom you have a dead short to ground in the circuit that's blowing the fuse. If you want to find it without an electronic Fault Finder like the GTC-FF310 ($167.86) I suggest you do what mechanics call a pin and wiggle test. By physically tracing the wires on both sides of the fuse buss you will soon find splices and branch circuits. Chances are you will find a single wire with the insulation rubbed off and against a frame weldment. Simply unplug components you find connected into your specific circuit and try powering up with the 15 amp fuse, sized by the factory engineer for ampacity and dielectric protection, after each component you disconnect. I know this is time consuming but the bottom line is you will do it or pay someone to do it and from your post the Dealer doesn't have a clue. I always try to get the electrical one line diagram and study it for spliced branch circuits. Remember, all the components can be disconnected from a circuit and you must pain stakingly test each disconnect component each time under power to see if it clears the shorted circuit to ground.
 

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