520 xi toro/WH

[tooltime1 0]

Hi, I  have a 1998 , toro /wh 520 xi. Has a Kohler 20 HP,  445 hours, recently, the battery light comes up  on the dash,while mowing after a hour of mowing, battery is completely drained, and will not start tractor without a jump start. 
1) i replaced old batt with new battery
2)cleaned connections
3) same issue,with dis charging, with new battery install

voltage check  at battery not running = 13.36v
voltage check with engine running  half throttle = 12.1   and the longer the eng runs the lower the volts drop,light on dash comes on, and if i mow,battery is dead in 1 hour. 

Any ideas what i can check or do? Thanks jim




 

[gwest_ca-(File Mod) 10,488]

Here are some detailed wiring diagrams you can download.
http://www.wheelhorseforum.com/files/file/3737-tractor-1998-520xi-520xie-wiring-detailedpdf/

First check to make
Turn the ignition switch to the RUN position without the engine running.
Record the voltage across the battery posts.
Now go to the voltage regulator on the engine and check the voltage on the violet wire to the B+ regulator terminal. It should be the same as the first battery voltage check. If not that likely is your problem. This test checks the path the charge current takes to get to the battery.

Let us know what you find because there is more.

Garry

[shallowwatersailor 3,213]

The regulator is under the engine on the left side.