Headlights; Taillight-Brakelight; Ignition Timing; Tilt Sensor - Toro 500 EFI Service Manual


NOTE: If voltage rises above 15.5 DC volts, the reg-
ulator is faulty or a battery connection is loose or
corroded. Clean and tighten battery connections or
replace the regulator/rectifier. If voltage does not rise,
replace the regulator/rectifier.

Headlights

The connectors are the four 2-prong ones secured to the
headlight bulbs (two on each side).
VOLTAGE

NOTE: The low beams are the outside bulbs (black
and white wires) and the high beams are the inside
bulbs (yellow and black wires). Always connect the
black tester lead to the black wires. The ignition
switch must be in the ON position.
1. Set the meter selector to the DC Voltage position.
2. Set the light switch to the correct position for the
affected light; then connect the black tester lead to the
black wire using needle adapters.
3. Connect the red tester lead to the yellow wire (high
beam) or white wire (low beam) using needle adapters.
The meter must show battery voltage.

NOTE: If battery voltage is not shown in any test,
inspect the LIGHTS fuse on the power distribution
module, headlight switch, ignition switch, switch con-
nectors, or wiring harness.

Taillight-Brakelight

VOLTAGE (Taillight)

NOTE: Perform this test at the socket end of the tail-
light-brakelight harness (pigtail). The ignition switch
must be in the ON position and either high beam or
low beam selected on the light switch.
1. Set the meter selector to the DC Voltage position.
2. Connect the black tester lead to the black wire; then
connect the red tester lead to the white wire. The
meter should show battery voltage.
3. With the ignition key in the LIGHTS position, the
meter must show battery voltage.

NOTE: If battery voltage is not shown and the head-
lights are illuminated, inspect the three-wire connec-
tor in the left-rear canopy tube at the juncture of the
canopy tube and lower frame. If battery voltage is
shown on the meter, replace the bulb.
VOLTAGE (Brakelight)

NOTE: Perform this test at the socket end of the tail-
light-brakelight harness (pigtail). The ignition switch
must be in the ON position.
1. Set the meter selector to the DC Voltage position.
2. Connect the red tester lead to the red/blue wire; then
connect the black tester lead to the black wire.
3. With the brake applied, the meter must show battery
voltage.

NOTE: If the meter shows no voltage, inspect the 10
amp ignition (IGN) fuse, brakelight switch, wiring har-
ness, or connectors.

Ignition Timing

The ignition timing cannot be adjusted; however, verifying
ignition timing can aid in troubleshooting other components.
To verify ignition timing, use the following procedure.

NOTE: To check ignition timing, the seat, seat back,
and seat base must be removed.
1. Attach a suitable timing light to the spark plug high
tension lead; then remove the timing inspection plug
from the left-side crankcase cover.
2. Start the engine and using the RPM function on the
speedometer/tachometer, run at 1500 RPM; ignition
timing should be 10° BTDC.
3. Install the timing inspection plug.
If ignition timing cannot be verified, the rotor may be dam-
aged, the key may be sheared, the trigger coil bracket may
be bent or damaged, or the ECM may be faulty.

Tilt Sensor

! WARNING
Incorrect installation of the tilt sensor could cause sud-
den loss of engine power which could result in loss of
vehicle control resulting in injury or death.
CAUTION
Do not drop the tilt sensor as shock can damage the
internal mechanism.
SUPPLY VOLTAGE
1. Disconnect the three-wire connector from the sensor;
then select DC Voltage on the multimeter and con-
nect the red tester lead to the orange wire (C) and the
black tester lead to the black wire (A).
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