LAWN & GARDEN PRODUCT ELECTRICAL ELECTRICAL SYSTEM INFORMATION FOR LAWN & GARDEN PRODUCT 106 S–1612
ELECTRICAL LAWN & GARDEN PRODUCT 20 & 22” BATTERY INFORMATION GENERAL INFORMATION (COURTESY OF HAWKER ENERGY PRODUCTS INC.) The battery used on the 20 & 22 inch walk–behind is a Sealed–Lead Battery which utilizes cells made of a pure lead–tin material. These types of batteries are classified as “non–spillable wet electric storage batteries” and may be shipped as such. (Figure 13) Overcharging and undercharging can both decrease battery life.
LAWN & GARDEN PRODUCT 20 & 22” BATTERY INFORMATION – continued ELECTRICAL REMOVAL/NORMAL RECHARGING 1. Disconnect wiring harness. (Figure 14) 2. Push quick release and remove battery case. 3. Attach charger to battery. (Figure 15) 4. Plug charger to an electrical outlet. 5. Charge for 12–16 hours. 6. Disconnect charger from outlet and wall. 7. Attach battery case to handle. 8. Connect wiring harness to battery.
ELECTRICAL LAWN & GARDEN PRODUCT TRACTOR BATTERY INFORMATION GENERAL INFORMATION WARNING: Batteries produce explosive gases. Keep cigarettes, flames and sparks away from batteries at all times. Protect your eyes at all times. Never lean over a battery when jump starting or performing other maintenance. Remove and replace any battery that has evidence of cracks in the case or cover. If the battery is leaking, place the battery in a plastic bag and take to a proper recycling plant.
LAWN & GARDEN PRODUCT ELECTRICAL TRACTOR BATTERY INFORMATION – continued Jump Starting The Battery Battery Charging Tips S Charge the battery if the circuit reading is below 12.4 volts or the Specific Gravity reading from a hydrometer is below 1.225 SG or the load test is below 9.6 volts. S Keep vent caps in place when charging battery. Accidents happen! Always shield your eyes and face when working around batteries. Make sure the vent caps are pushed in completely and cover with a damp cloth.
ELECTRICAL LAWN & GARDEN PRODUCT TESTING THE SOLENOID When the engine of a riding mower will not turn over, there are a few possible reasons for this outside of the engine itself. One reason is the battery does not have sufficient charge (refer to pages 54–55 for charging information). Another reason is a problem with the Wiring Harness/Operator Presence System (refer to pages 56–64 for troubleshooting information). Finally, the last possible reason is a bad solenoid.
RIDING MOWERS ELECTRICAL INTRODUCTION The four DIAGNOSTIC CHARTS contained in this section are intended to assist the technician in diagnosing electrical issues with MURRAY riding mowers. Most of the wiring and components described in the charts are common to riding mowers MURRAY has produced since 1970. However, the seat switches and double pole switches utilized in the operator presence circuits apply to products produced since 1987.
ELECTRICAL RIDING MOWERS REFERENCE NUMBERS At selected points in the DIAGNOSTIC CHARTS, you will be instructed to “See” a particular number. Listed below are details of the twelve numbers referenced in the charts. 1. FUSE 1. Never install a fuse with a higher than recommended amperage rating. 2. Make certain the fuse is fully inserted into the holder. 2. WIRING HARNESS 1. Inspect all wires for breaks, damaged insulation, loose and/or corroded connections. 2.
RIDING MOWERS ELECTRICAL REFERENCE NUMBERS 6. BATTERY 1. Make sure the ground cable of the battery is firmly attached to the frame of the riding mower and the electrical connection is free of paint and corrosion. 2. Check the OPEN CIRCUIT VOLTAGE of the battery. Use the chart below to determine the state of charge of the battery. BATTERY VOLTAGE 12.6 12.4 12.2 12.0 11.8 STATE OF CHARGE 100% 75% 50% 25% 0% 3. Charge the battery per the recommendations on the battery labeling. 4.
ELECTRICAL RIDING MOWERS REFERENCE NUMBERS 9. PTO SWITCH 1. All PTO switches (since 1987) are double pole single throw (DPST). 2. The normally open (NO) set of poles are utilized in the solenoid primary circuit. 3. The normally closed (NC) set of poles are utilized in the operator presence circuit. 10. CLUTCH SWITCH 1. Depending on the application, this switch could be a DPST or a single pole single throw (SPST).
RIDING MOWERS ELECTRICAL THE VISUAL CHECK A 1. 2. 3. DIAGNOSTIC CHART 1 Disengage PTO Depress Clutch / Lock Parking Brake Turn Key Switch to START B C CRANKS NO CRANKS IF NO START GO TO ENGINE CRANKS / NO START SECTION 1. 2. Visually check Battery Connections Visually check Wiring Harness D G NOT OK 1. 2. 3.
ELECTRICAL RIDING MOWERS BLOWN FUSE 1. DISCONNECT: 2. 3. DIAGNOSTIC CHART 2 Ignition Key Switch connection Wiring Harness Connections to ENGINE Solenoid Primary Wire INSTALL NEW FUSE A SEE 1 B C FUSE BLOWS GOOD FUSE 1. SEE 2 2.
RIDING MOWERS ELECTRICAL GOOD FUSE / NO CRANK A 1. 2. DIAGNOSTIC CHART 3 – Part 1 – Disconnect Spark Plug Drive System in NEUTRAL CHECK BATTERY SEE 6 B C BATTERY LOW BATTERY OK Charge & Load Test Turn Key Switch to START D E BATTERY LOW Remove and Replace SOLENOID ENGAGES “CLICKING” SOLENOID NOT ENGAGING 1. 2. SEE 8 SEE 7 Check Solenoid Primary Wire Turn Key Switch to START G F NOT CRANKING CRANKING 1. 2.
ELECTRICAL RIDING MOWERS DIAGNOSTIC CHART 3 – Part 2 – SEE 9 / SEE 10 Check normally open side of PTO and Clutch Switches J K SWITCHES BAD Remove and Replace as necessary SWITCHES GOOD Turn Key Switch to START L M CRANKING 1. 2. NOT CRANKING Replace Spark Plug Turn Key Switch to START IF NO START GO TO ENGINE CRANKS / NO START SECTION SEE 3 1. 2. Check for correct Switch Check continuity in START Position N O KEY SWITCH BAD KEY SWITCH OK 1. 2.
RIDING MOWERS A ELECTRICAL DIAGNOSTIC CHART 4 ENGINE CRANKS / NO START TRACTORS WITH SHIFT LEVER LOCATED AT CENTER CONSOLE REAR ENGINE RIDER RAIL FRAME TRACTOR D Occupy Seat while Cranking Engine B C START NO START BEGIN MOWING 1. 2. Disconnect Engine Kill Wire or Engine Kill / Fuel Solenoid Connection Turn Key Switch to ON Check Continuity of Engine Kill Wire to Ground E F CONTINUITY NO CONTINUITY SEE 12 G EQUIPPED WITH FUEL SOLENOID NOT EQUIPPED WITH FUEL SOLENOID J SEE 5 1. 2.
TABLE OF CONTENTS–ELECTRICAL SCHEMATICS ELECTRICAL WIRING SCHEMATICS 2002 & PREVIOUS HARNESSES MAIN HARNESS: 250X50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 MAIN HARNESS: 250X62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 MAIN HARNESS: 250X63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRICAL WIRING SCHEMATICS 24x30 24285 91031 250x40 SEAT SWITCH 92377 SEAT SWITCH CONNECTOR 24273 24273 24x29 MAIN HARNESS: 250X50 LIGHT HARNESS: 250X40 WIRING DIAGRAM FOR: 30, 38, 40” PAN FRAME 1995–2000 AC/DC SYSTEM 122 S–1612
ELECTRICAL WIRING SCHEMATICS 24x30 91031 SEAT SWITCH 24285 SEAT SWITCH CONNECTOR 250x40 92377 91299 91299 24x29 MAIN HARNESS: 250X62 LIGHT HARNESS: 250X40 WIRING DIAGRAM FOR: 46, 52” GT 1995–1998 OPPOSED TWIN S–1612 123
ELECTRICAL WIRING SCHEMATICS 24x30 91031 SEAT SWITCH 24285 SEAT SWITCH CONNECTOR 250x40 92556 91299 91299 24x31 MAIN HARNESS: 250X63 LIGHT HARNESS: 250X40 WIRING DIAGRAM FOR: 46, 52” GT 1996–1998 18, 20 HP KOHLER; 20, 22 HP B&S 124 S–1612
ELECTRICAL WIRING SCHEMATICS 24x24 24x3 94613 24x24 91032 24273 91031 SEAT SWITCH SEAT SWITCH CONNECTOR MAIN HARNESS: 250X84 21064 WIRING DIAGRAM FOR: REAR ENGINE RIDER WITHOUT LIGHTS S–1612 125
ELECTRICAL WIRING SCHEMATICS 24x24 24x3 94613 24x24 24273 91032 91031 91846 SEAT SWITCH SEAT SWITCH CONNECTOR MAIN HARNESS: 250X85 WIRING DIAGRAM FOR: REAR ENGINE RIDER WITH LIGHTS 126 S–1612
ELECTRICAL WIRING SCHEMATICS SEAT SWITCH CONNECTOR SEAT SWITCH 24x32 94159 94613 92377 94136 94136 24x31 MAIN HARNESS: 250X86 SEAT HARNESS: 250X67; LIGHT HARNESS: 250X92 WIRING DIAGRAM FOR: 38, 40, 42, 46” LT 1997–2001 SINGLE CYLINDER WITHOUT AFTERFIRE SOLENOID S–1612 127
ELECTRICAL WIRING SCHEMATICS SEAT SWITCH CONNECTOR SEAT SWITCH 24x32 94159 94613 250x90 92377 94136 94136 24x31 MAIN HARNESS: 250X86 SEAT: 250X67; LIGHT: 250X92; EXTENSION: 250X90 WIRING DIAGRAM FOR: NOTE: 250X86 & 250X90 ARE AVAILABLE AS PART NUMBER 776170 128 42” LT 2000–2001; 46, 52” GT 1999–2001 OPPOSED TWIN CYLINDER WITHOUT AFTERFIRE SOLENOID S–1612
ELECTRICAL WIRING SCHEMATICS SEAT SWITCH CONNECTOR SEAT SWITCH 24x32 94159 94613 92556 94136 94136 24x31 MAIN HARNESS: 250X87 SEAT HARNESS: 250X67; LIGHT HARNESS: 250X92 WIRING HARNESS FOR: 38, 40, 42, 46” LT SINGLE CYLINDER 1997–2001; 42” LT V–TWIN CYLINDER 2001; 46, 52” GT V–TWIN CYLINDER 1999–2001 WITH AFTERFIRE SOLENOID S–1612 129
ELECTRICAL WIRING SCHEMATICS 24x30 94613 91031 24273 SEAT SWITCH CONNECTOR 24x29 SEAT SWITCH 21064 ‘‘ (PEDAL UP) 24273 MAIN HARNESS: 250X88 WIRING HARNESS FOR: 38” PAN FRAME 1998–2000 EXPORT WITHOUT HEADLIGHTS DC ONLY 130 S–1612
ELECTRICAL WIRING SCHEMATICS 24x30 94613 91031 250x40 SEAT SWITCH 91846 24x29 SEAT SWITCH CONNECTOR 24273 MAIN HARNESS: 250X89 24273 LIGHT: 250X40 WIRING HARNESS FOR: (PEDAL UP) S–1612 38” PAN FRAME 1998–2000 EXPORT WITH HEADLIGHTS DC ONLY 131
ELECTRICAL WIRING SCHEMATICS 24x32 94613 690106 94159 250x92 92377 24x31 94136 94136 MAIN HARNESS: 250X93 LIGHT: 250X92; SEAT: 250X94 WIRING HARNESS FOR: 30” REAR DISCHARGE 1999–2001 EXPORT 132 S–1612
ELECTRICAL WIRING SCHEMATICS 94613 1401149 24x24 94136 94159 SEAT SWITCH 24x37 24x24 SEAT SWITCH CONNECTOR 94136 MAIN HARNESS: 250X102 WIRING HARNESS FOR: 30” MID–ENGINE RIDER 2001 DOMESTIC S–1612 133
ELECTRICAL WIRING SCHEMATICS 94613 1401149 24x24 94136 94159 SEAT SWITCH 24x37 24x24 SEAT SWITCH CONNECTOR MAIN HARNESS: 250X103 WIRING HARNESS FOR: 94136 30” MID–ENGINE RIDER 2001 EXPORT 134 S–1612
ELECTRICAL WIRING SCHEMATICS 24x32 21075 94159 94613 92556 1001575 24x31 1001575 MAIN HARNESS: 250X112 LIGHT: 250X92; SEAT: 250X67 WIRING HARNESS FOR: 40, 42, 46” LT RAIL FRAME 2003 EXPORT WITH AFTERFIRE SOLENOID S–1612 135
ELECTRICAL WIRING SCHEMATICS 24x32 21075 94159 94613 92377 1001575 24x31 MAIN HARNESS: 250X113 1001575 LIGHT: 250X92; SEAT: 250X67 WIRING HARNESS FOR: 38, 40” LT RAIL FRAME 2003 EXPORT WITHOUT AFTERFIRE SOLENOID 136 S–1612
ELECTRICAL WIRING SCHEMATICS 94613 1401149 24x24 1001575 94159 92739 24x24 24x37 1001575 MAIN HARNESS: 250X115 WIRING HARNESS FOR: 30” MID–ENGINE RIDER 2003 DOMESTIC & EXPORT S–1612 137
ELECTRICAL WIRING SCHEMATICS 24x32 21075 94159 94613 92377 94136 24x31 MAIN HARNESS: 250X116 LIGHT: 250X92; 94136 138 SEAT: 250X67 WIRING HARNESS FOR: 38, 40” LT RAIL FRAME 2003 WITHOUT AFTERFIRE SOLENOID S–1612
ELECTRICAL WIRING SCHEMATICS 24x32 21075 94159 94613 92556 94136 24x31 MAIN HARNESS: 250X117 LIGHT: 250X92; 94136 SEAT: 250X67 WIRING HARNESS FOR: 40, 42, 46” LT RAIL FRAME 46” GT RAIL FRAME 2003 WITH AFTERFIRE SOLENOID S–1612 139
ELECTRICAL WIRING SCHEMATICS 24x30 21075 94613 94159 250x92 92377 24273 24x29 24273 MAIN HARNESS: 250X122 LIGHT: 250X92 WIRING HARNESS FOR: 38” LT PAN FRAME 2003 140 S–1612
