Help with battery light always on

[trikepilot]

Sorry if this has been covered. I tried searching the forum but I came up empty. I am NEW to tractors and diesels so bear with me.

My new-to-me 2010 B7510 has the battery light on at all times. I checked the battery with engine off and it has 12.7v. I ran the rpms up to operating levels and I have 15v. So it appears the alternator (generator) is working. Tractor runs fine with no issues. I mowed 2 hours last weekend.

Is there a regulator or rectifier I should check? Can anyone point me towards some online resource to help track down this issue? I am no expert on vehicle electronics but neither am I ignorant to the basics. I have a DVM and tracked down what I know but I have hit a dead end as to why the battery light is always on.

Thanks in advance!

 

[Dave_eng]

You need to be methodical to solve this issue. A battery showing 15 volts with the engine running is not good. The voltage is too high.

The dynamo rarely fails so I suggest you focus on the rectifier first. The test table is a series of checks made reading resistance or Ohms.
Any test not meeting the table conditions means the regulator has failed.

From the WSM, the trouble shooting suggestions for the condition warning light always ON.

Remember that testing the dynamo involves measuring Alternating Current voltage not the usual Direct Current voltage.

Dave

 

[SidecarFlip]

A bad rectifier will boil out a battery. You adding water often?

 

[trikepilot]

You need to be methodical to solve this issue. A battery showing 15 volts with the engine running is not good. The voltage is too high.

The dynamo rarely fails so I suggest you focus on the rectifier first. The test table is a series of checks made reading resistance or Ohms.
Any test not meeting the table conditions means the regulator has failed.

From the WSM, the trouble shooting suggestions for the condition warning light always ON.

View attachment 47390

View attachment 47389

Remember that testing the dynamo involves measuring Alternating Current voltage not the usual Direct Current voltage.

View attachment 47391

Dave

Thanks. Will go dive back in this weekend.