Case 580SR Service Manual page 340

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274 SECTION 21 - TRANSMISSION
Key on power
T-LED Blinks
N-LED Blinks Slower
Select neutral and push kickdown
button:
1 red - 7 green
Check battery voltage above
NO
17.7 Volts
Check dual battery connection is
parallel and okay
Check alternator output
Repair or
NO
is it correct
replace
YES
No input fault
NO
YES
Other input fault
NO Check through F1, F2, F3 or
F11
YES
YES
NO
YES
YES
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Disconnect and
reconnect correctly
YES