L1500 alternator replaced

[KennyMillar]

I've had my L1500DT for about 3 months now.
The battery hasn't been charging, and when I tested the alternator there was no voltage at all coming from it. (Energised, bench test).
So I bought a new one from Stavros-Savva and fitted it tonight.
Now, charging voltage at the battery is about 18V at 2000 RPM.

This seems a bit high to me? So I suspect either a wiring issue or the voltage regulator. I can check the wiring but not sure I can test the regulator.
I don't just want to keep firing the parts canon either.

Will a charging voltage of 18V damage my battery?

 

[Jim L.]

Will a charging voltage of 18V damage my battery?

Yes, it will damage it. Normal charging voltage should be about 14 VDC.

I think that there is a wiring issue, which could include the ground (chassis) reference connection.

 

[KennyMillar]

Will a charging voltage of 18V damage my battery?

Yes, it will damage it. Normal charging voltage should be about 14 VDC.

I think that there is a wiring issue, which could include the ground (chassis) reference connection.

Thanks! I will check the wiring next chance I get to work on the tractor.
I found the WSM for the L175 which is pretty similar. It has a good diagram of the alternator and regulator wiring.

 

[Jim L.]

Another possible issue is with the mechanical regulator. If the points have gone bad, then too much current could be allowed through the field coil, indicated as a voltage rise.

Not knowing if the regulator is original, it could be possible that the existing regulator has an adjustment setting underneath it.

Besides a direct replacement of a mechanical regulator, there are many solid-state replacements.

Good luck with your project.

 

[KennyMillar]

Another possible issue is with the mechanical regulator. If the points have gone bad, then too much current could be allowed through the field coil, indicated as a voltage rise.

Not knowing if the regulator is original, it could be possible that the existing regulator has an adjustment setting underneath it.

Besides a direct replacement of a mechanical regulator, there are many solid-state replacements.

Good luck with your project.

Thank you!
I'm reasonably sure it's the original regulator. I'll try to get some time to strip it down and check.