My 520H is over charging

[dmyers 5]

My 520H is over charging at 17 volts and around 14 volts with the headlights on. The battery is newer and I swapped out the regulator from another 520H that is works properly. The regulator that came off the over changing tractor works fine on my other tractor. I hope one of you can suggest something I missed to help me get it running again.

[953 nut 55,074]

Generally you will find that overcharging is due to a poor ground on the regulator. Clean up the contacts and mounting points on the old regulator and it probably will work fine.

[dmyers 5]

I much appreciate the tip I’ll try it tomorrow. 

[JoeM 7,871]

6 hours ago, 953 nut said:

poor ground on the regulator

Plus, If you are relying on the volt meter on the machine, double check with another meter. I always use a hand held meter to check against the one on the machine. 

[dmyers 5]

Thanks for your input I did use a handheld meter and I was surprised how accurate the tractors meter was.

[dmyers 5]

I think the over charging issue will be my ignition switch. I have no continuity between the B plug and the R plug when the switch is in the ON position. I'll find out for sure once I get a new switch. Thank everyone who responded.

[lynnmor 7,302]

The voltage should be correct at the center terminal of the voltage regulator, nothing downstream will increase the voltage.

[gwest_ca-(File Mod) 11,032]

23 hours ago, dmyers said:

I think the over charging issue will be my ignition switch. I have no continuity between the B plug and the R plug when the switch is in the ON position. I'll find out for sure once I get a new switch. Thank everyone who responded.

Don't know what model year your 520 is but most do not use the R terminal on the ignition switch. No wire to it.

 

Garry

[dmyers 5]

I did see until after your comment that the wiring diagram shows the R terminal isn’t used, so even though it didn’t test out it doesn’t matter Because it’s not used. I appreciate all suggestions.