Voltage reg Kubota 7100

[Robw54]

Got a little Kubota putting out 17+V on the battery so I've just been running with it disconnected to avoid it boiling the battery but it's a pain not charging.

Opened up the regulator tonight and this look to be melted which would explain it being f'ed? Can get a new ones about £40 but checking it can't be anything else (tried diff alternator and battery).

Also found this other wire (not the red, that's the battery ) no idea what it should be connected to and if related to the reg problem?

 

[Ukjay]

Check the wire that has expanded too (1st pic, correded terminal) - there is something amiss there

 

[Robw54]

Check the wire that has expanded too (1st pic, correded terminal) - there is something amiss there

Think that the blue on this

 

[Mursal]

Not so bad its charging ........................
Lads do put a switch (if its the weekend) on where the regulator should go, give it a bit of a charge, you can set the voltage with engine revs, then when charged, flick the switch.

 

[Mursal]

A few more here at different price points click

 

[Robw54]

Not so bad its charging ........................
Lads do put a switch (if its the weekend) on where the regulator should go, give it a bit of a charge, you can set the voltage with engine revs, then when charged, flick the switch.

I would but other use it and it might blow.

 

[Ukjay]

Think that the blue on this

View attachment 676986

You may find that it has cooked the wiring - so best check and replace what is needed. No point changing rectifier is the wiring is shot.

 

[Mursal]

Well you need a new one anyway, so just proceed with caution when you plug the new one in.
External regulators are hard to fault find, so hopefully you have the problem.

 

[Mursal]

Another lad in trouble click
I was looking or a wiring diagram for you, but found the above instead ..............

 

[Pheasant Surprise]

Not so bad its charging ........................
Lads do put a switch (if its the weekend) on where the regulator should go, give it a bit of a charge, you can set the voltage with engine revs, then when charged, flick the switch.

That’s called de-sulphation mode, chuck 17 volts at the battery to blow the crap off the plates. Pay good money for that in a fancy smart charger.

 

[Pheasant Surprise]

Got a little Kubota putting out 17+V on the battery so I've just been running with it disconnected to avoid it boiling the battery but it's a pain not charging.

Opened up the regulator tonight and this look to be melted which would explain it being f'ed? Can get a new ones about £40 but checking it can't be anything else (tried diff alternator and battery).

Also found this other wire (not the red, that's the battery ) no idea what it should be connected to and if related to the reg problem?

Extract of Electrical System from WSM below, might help you.

See Fig N-4 and N-5 on page 5 for charging circuit.

 

[Robw54]

We look to be sorted with the new reg. Before and after.

 

[Mursal]

A new regulator is a tad extravagant, but we'll let it go ....................

 

[Robw54]

A new regulator is a tad extravagant, but we'll let it go ....................

Solid state too