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John Deere 200LC won’t crank

D

Dlunamand

Member
Joined
Mar 7, 2018
Messages
7
Location
Olive Branch ms
I have a problem with a 200LC John Deere I need help with. It won’t crank and when you turn the key off after trying to crank it the battery relay stays energized. I have determined the alt shut down relay and starter protection relay are staying energized thru a ground signal coming from the monitor. I have more information if anyone can help
 
Former Wrench

Former Wrench

Senior Member
Joined
Jan 3, 2014
Messages
470
Location
Montesano, WA
Occupation
Retired
See if you can find somewhere to bar the engine over. Crankshaft, Flywheel, whatever is easily to reach. It is important to rule out a seized engine.
 
0

02Dmax

Senior Member
Joined
Dec 4, 2007
Messages
687
Location
MO
Dlunamand said:
I have a problem with a 200LC John Deere I need help with. It won’t crank and when you turn the key off after trying to crank it the battery relay stays energized. I have determined the alt shut down relay and starter protection relay are staying energized thru a ground signal coming from the monitor. I have more information if anyone can help
Click to expand...
Does it click or anything when you try to start it? I've had to replace a bunch of those main relays on those exact machines.
 
D

Dlunamand

Member
Joined
Mar 7, 2018
Messages
7
Location
Olive Branch ms
It will crank if I unhook the alternator excitation resistor. I am getting battery voltage to the monitor pin 42 when the key is turned on.
 
0

02Dmax

Senior Member
Joined
Dec 4, 2007
Messages
687
Location
MO
Dlunamand said:
It will crank if I unhook the alternator excitation resistor. I am getting battery voltage to the monitor pin 42 when the key is turned on.
Click to expand...
I'd say replace the alternator. Had a JCB do that exact thing to me once.
 
rmllarue91

rmllarue91

Senior Member
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Apr 16, 2014
Messages
701
Location
northeast pa
Occupation
field technician
Did you ever get it sorted out? Grounding the wire will make it start but battery light will be on.
 
rmllarue91

rmllarue91

Senior Member
Joined
Apr 16, 2014
Messages
701
Location
northeast pa
Occupation
field technician
It seems like with key on engine off should be getting like 8-14 volts on d+ not 20+ volts could this just be the resistor out of spec?
 
rmllarue91

rmllarue91

Senior Member
Joined
Apr 16, 2014
Messages
701
Location
northeast pa
Occupation
field technician
I hope that's it I just have issue believing that a bad alternator can cause a no crank. but maybe it was a design flaw because the c model it's separate the excite circuit from charging light indicator. New alternator shows a separate resistor that goes from b+ to d+ making it self excite. Going to see if dealer has any paperwork with updated alternator
 
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