Cub Cadet RZT-S Series - Manual (Page 68)

RZT-S
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• 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 power is not being turned off. Check for power at the sole-
noid. Check continuity between G and L terminals. Check for no continuity between L and the B terminals.
NOTE: If the engine is at an idle when the key is turned off, fuel is drawn into the engine through the idle ports
of the carburetor by-passing the fuel shut off solenoid. The raw fuel will travel through the engine and ignite in
the muffler causing an after fire.
• 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 continuing to operate. Check continuity between the M and G termi-
nals in the OFF position. Check continuity from yellow wire connection all the way to the spade terminal
on the magneto.
2. In the START position, continuity can be found between B, S, and L terminals.
• Battery power from the B terminal is directed to the start circuit through the S terminal and to the after fire
solenoid through L.
• 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 parking brake and PTO switches.
• Symptom: No crank, solenoid click: The problem lies in the heavy gauge side of the starter circuit; low
battery voltage, battery cables, starter cable, solenoid, or ground issue.
• Symptom: Crank, spark, but no fuel: First check the fuel tank to verify that there is fuel in it. If there is fuel
in the fuel tank, test for power at the after fire solenoid. If there is no power there, then check for continuity
from B to L in the START position. If power is reaching the red wire that connects to the L 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 after fire solenoid to lis-
ten 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, 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.
NOTE: An incorrect key switch may send power to the primary winnings of the ignition module instead of a
ground signal. If this happens, the module will need to be replaced.
3. In the RUN position (green zone), the B and L terminals should have continuity. Once the engine is running,
the alternator produces current that tracks back to charge the battery via the red wire, bypassing the key
switch.
• Symptom: Battery does not charge: Follow the engine manufacturer’s recommendations for testing alter-
nator output. If alternator output is getting to fuse, 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 battery 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 from the L terminal of the key switch.