Electrical Systems
7.13
Start / Stop Regulator Troubleshooting -- Theory Of Operation
The LR module provides the following functions that are important to remember:
S Controls the starting circuit.
S Provides switched DC voltage once engine has started.
S Regulated and rectifies AC voltage on CARBURETED MODELS only.
S Controls the engine kill circuit.
Step--By--Step Starting Pro cess
1. When the lanyard is inserted into the start/stop switch, the engine kill circuit is opened. (BLK/Y and BLK wires
inside start/stop switch assembly on handlebar.
2. Pressing the start/stop button completes the power--side of the starter motor solenoid circuit. (RED/PUR and
YEL/RED wires inside start/stop switch assembly on handlebar. Battery voltage must be present on the
YEL/RED wire when the start/stop button is pressed.
3. The ground side of the starter solenoid is the BLK/W wire. This wire runs between the solenoid and the LR
module. The circuitry inside the LR module controls the grounding of the BLK/W wire.
4. In order to start the engine, the LR module must observe that the engine is stopped, the tachometer signal is
below a specified RPM, and MFI security lockout is not enabled.
5. The LR module’s tachometer input is via the YEL wire.
6. The MFI security lockout function simply allows the MFI to ground the PUR/W wire. The MFI must ground this
wire to start the engine. The LR module circuity connects the BLK/W and PUR/W circuits when the start/stop
button is pressed, and the engine is stopped. If the MFI security lockout is disabled, the starter solenoid will
complete the starter motor circuit, and provide power to the starter motor.
Step--By--Step Engine Kill Process
1. The LR module recognizes when the tachometer signal, YEL wire, is above a specified RPM and therefore the
engine is running. (DIt models only.) On carbureted models, the LR looks for 2 to 5 Vdc on the BLK/YEL
circuit to know that the engine is running.
2. When the lanyard is removed, the engine kill circuit is closed, which grounds the BLK/YEL circuit and tells the
EMM or CDI module to kill the ignition system and stop the engine.
3. When the start/stop button is pressed while the engine is running, the LR module circuitry will ground the
BLK/YEL circuit because of the tachometer input. (DIt models only.) Carbureted models look for voltage
above 2 to 5 Vdc on BLK/YEL wire. If 2 to 5 Vdc is present when the start/stop button is pressed, the LR
module grounds the BLK/YEL circuit.
Step--By--Step Pump Switch Pro cess
Once the LR module believes that the engine is running because of the signal it receives from the YEL tachometer
circuit, the module connects the RED/PUR and OR circuits together. When this is accomplished, battery voltage
is present on the OR circuit throughout the electrical system.
Switched DC Circuit Override
It is possible to energize the OR circuit when the engine is off. To do so, press and hold the bilge button. Doing
this connects the RED/PUR and OR circuits inside the start/stop switch assembly. This will allow you to operate
the bilge pump and the reverse motor functions.
Bilge Pump
Battery voltage is supplied to pump on orange wire from LR module when engine is running, or when the bilge
button is pressed when the engine is stopped. To test pump apply alternate power and ground. If pump
does
not run
replace bilge pump. If pump runs with alternate power and ground start engine and check for battery volt-
age on Orange wire. Verify that the fuse protecting the bilge pump is not blown. If no power, replace LR module
or repair connection. If power is present on Orange terminal inspect pump ground circuit.
S If pump continues to run after engine is off replace LR module.
S Inspect inlet area regularly for debris.
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