Http://manuals.deere.com/cceomview/OMM154566_A7/Output/Index.html
i found this online I hope it helps.
SOURCE: John Deere Lawn Tractor LX176. Battery discharge
Locate voltage regulator above battery to the left as you sit on machine,its behind frame that supports steering wheel.Once you have found it use a light to shine on harness and follow the brown wire that leads into regulator.The plastic around that wire should not be burnt or showing any other color.The LX series machines had a problem with brown wire coming loose and causing the charging light to stay on.Remove plug from reg and use small screwdriver to clean out wire and work it a little so it makes good contact.
SOURCE: John Deere LX188 lawn tractor battery discharge light remaining o
Check the brown wire feeding your voltage regulator,its between batt and steering wheel behind left side of frame.LX100 series machines had a problem with brown wire not fully contacting terminal in regulator.You will know you had bad contact if plastic is discolored.
SOURCE: my john deere LA120 will only start with a jump,
Your starter may be nearing the end of its service life.
If it is worn down it may require more amperage than your battery can deliver to crank. That is why the extra battery helps. More amps!
You can start your tractor and check the wires to see if they are hot to the touch. That would be proof the starting system is drawing more amps. If it isnt hot then you might have connection problems or corrodes leads.
You can try replacing your battery wires to lower resistance and improve power transfer to the starter. Leads are cheap and available at most car parts stores.
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