Cub Cadet 1000 SERIES Service Manual page 77

• Symptom-engine runs with key in OFF position:
The key switch is not completing the path to
ground either because of an internal fault or a
bad ground connection elsewhere in the har-
ness. Check continuity between M, G, and A1
terminals with key switch in OFF position.
Check green wire continuity to ground.
• Symptom-loud "BANG" when key is turned to
the OFF position: The after-fire solenoid is not
closing, either because it is physically damaged
or the alternator output is not getting grounded.
Check for power at the solenoid. Check continu-
ity between G and A1 terminals. Check continu-
ity from red wire to afterlife solenoid.
• Symptom-Engine runs 3-5 seconds after key is
turned to OFF position: The after-fire solenoid is
turning-off the fuel supply, but the ignition is con-
tinuing to operate. Check continuity between the
M and G terminals in the OFF position. Check
continuity from yellow wire connection all the
way to the spade terminal on the magneto.
38.5. In the START position, continuity can be found
between B, S, and A1 terminals.
• Battery power from the B terminal is directed to
the start circuit through the S terminal and to the
afterlife solenoid through A1. There is no alter-
nator output to A1 until the engine is running.
• Symptom-No crank and no starter solenoid
click: Power is not getting to the trigger spade on
the starter solenoid. Test for a good battery
then check for power where the fused red wire
with white trace connects to the B terminal.
Check for continuity between B and S terminals
in START position. If power is getting to the S
terminal in the START position, the problem lies
down-stream in the starter circuit;
Check continuity from the orange wire on the S
terminal to the orange wire with white trace on
the trigger spade on the starter solenoid. If it is
broken, trace through the brake and PTO
switches.
• Symptom-No crank, solenoid click: The problem
lies in the heavy-gauge side of the starter circuit;
battery cables, starter cable, solenoid, or ground
issue.
• Symptom-Crank, spark, but not fuel: First test
for power at the solenoid, if no power the check
for continuity from B to A1 in the START posi-
tion. If power is reaching the red wire that con-
nects to the A1 terminal in the start position, the
problem lies down-stream of the key switch. A
handy quick-check is to apply power to the red
wires where they connect to the S terminal
(whole circuit) or directly to the afterlife solenoid
to listen for the audible "click" that it makes when
functioning.
• Symptom-Crank, but no spark: This is a highly
unlikely scenario. If it occurs after a key switch
has been changed independently of the RMC
module, this would arouse suspicion that the
wrong key switch was installed. Otherwise, the
problem lies elsewhere in the safety circuits or
engine. Do not over-look the possibility of a bad
magneto or chafed ground lead within the
engine harness.
38.6. In the NORMAL RUN position (green zone), the
B and A1 terminals should have continuity. Once
the engine is running, the alternator produces
current that tracks-back from the A1 circuit to
charge the battery, via the red wire with white
trace connected to the B terminal.
The plain red wire carrying alternator current to
the A1 terminal doubles-back, with the second
plain red wire on that terminal supplying power
directly to the after fire solenoid.
• Symptom-Battery does not charge: If the switch
has continuity between B and A1 in the RUN
position, follow the engine manufacturer's rec-
ommendations for testing alternator out-
put.
If alternator output is getting to and through the
key switch, but not reaching the battery, the fuse
may have blown after start-up. A blown fuse will
disable the starter circuit.
A simple quick-test for the presence of alternator
output at the battery is to check across the bat-
tery posts for DC voltage.
• Symptom-After fire solenoid does not work:
engine starts and dies: The after fire solenoid is
powered directly by the red wire carrying alterna-
tor output, and should operate independently of
anything else on the tractor once the engine is
running. If the alternator fails and battery power
is not reaching the afterlife solenoid through the
key switch, it will not work. This is an unusual set
of circumstances.
38.7. In the REVERSE CAUTION MODE (yellow
zone), the same characteristics are true as for
the normal run position, but in addition the L ter-
minal will have continuity with the A2 terminal.
The A2 terminal is connected to the RMC mod-
ule by a white wire. The L terminal (formerly
used for the lighting circuit) connects directly to
the ground circuit of green wires.
When the key is in the REVERSE CAUTION
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Series 1000 and 1500