XL TRACTOR ELECTRICAL DEMYSTIFICATION GUIDE Table Of Contents – Page 1 of 1 GLOSSARY RELAY SOLENOID SWITCH SWITCH SEAT SWITCH TROUBLESHOOTING WIRING DIAGRAM STARTER MOTOR CIRCUIT SPARK CIRCUIT SPARK CIRCUIT CHARGING CIRCUIT LIGHTS CIRCUIT* -- 12 HP MODEL ONLY
Contents Glossary Relay 3 ........3 Brake Switch..................................... ...................................... 4 Ignition Switch.......................................................................... 4 Seat Switch.................................................................... ..........5 Solenoid ........................................................................... Troubleshooting I Wiring Diagram........................................................................
Relay Part Numbers 48-4700 Purpose 1 The relay monitors currentin one circuit. If current is present, it flips an SPDT (single pole, double throw) switch to the other position. How It Works A relay is actually two simpler parts working together. 1. Coil: Terminals 85 and 86 are connected to a coil. Applying 12 volts to these terminals energizes the coil turning it into an electromagnet. coil Terminals not energized Terminals 30+B7a closed open closed energized open Table 1 2.
Switch Part Numbers Brake/PTO Switch 88-9931 Purpose NC2 NOS SPDT Switch (at rest) Used as part of the safety interlock circuit, it is typically used to monitor the position of thePTOorbrakelever. How It Works ThisSPDTmicroswitchhasthreeterminals.Thelever is springloaded in the “up” position. When the lever on top of the switch is pushed, continuity switches from COM 1 and NC2, to COM1 and N03. 10081 Testing 1. Disconnect the switch from the harness. 2. Verify the conditions in the table.
. Switch Part Numbers 38-1420 Seat Purpose This switch monitors whether or not an operator is in the seat. How It Works Seat Switch (no operator) 10094 The switch is open without an operator and closed withan operator. The ribbon operates a friction mechanism which,in turn, activates the switch.A removable cover provides access to the switch contacts. Testing Note: Because of the friction mechanism, itis possible to get false readings with the switch removed from the seat.
Wiring Diagram . RED BATTERY NOT SUPPLIED WITH HARNESS SAFETY RELAY SOLENOID I RED GND WHITE I YELLOW I BLACK WHITE FUSE 7.5 amp GRAY SEAT SWITCH N.0, PTO SWITCH N.O. n RED GREEN DARK BLUE NEUTRAL SWITCH N.O. YELLOW BROWN LIGHTS N.O.
Starter Motor Circuit (ignition switch in“start” I I Fuse T“‘ Battery (12 volt) Starter Motor (turning) Re Brake Switch (brake on) amp) PTO Switch (deck disengaged) Ignition Switch (in ”start”) Solenoid (energized) Spark Circuit (ignition switch in“start” c o i l will not produce spark when light blue (kill) wire is grounded I I I I I I I I Re Battery (I2 volt) T-43134 Re Re Fuse (7.
Spark Circuit (ignition switch in "run Coil will not produce spark when light blue (kill)wire is grounded I I I I Re Re Re PTO Switch Switch Brake on) (brake Fuse Battery 2 volt) (7.5 amp) Switch R. Seat Switch (operator on) !- Safety Relay (energized) Ignition (in "run") 10257 Charging Circuit (12 volt) (charging) (turning) 10258 Lights Circuit* 12 hp model only (ignition switch in“run”) n I I Light Switch tight Coil (turning) *Use A.C. scale on VOM to test.
