Tomberlin 2010 E-Merge, Maintenance Manual, Page: 101 / 151

Troubleshooting
MERGE 10-11
Chapter 10
6. Reconnect the 3-wire connector on the motor speed sensor. Use a multimeter set to 20V DC,
connect the black (-) probe to the negative binding post of the battery pack and connect the red (+)
probe to green wire which is between the 3-wire connector on the motor speed sensor.
6.1 Jack up a rear wheel so that it is off the ground. Turn the rear wheel slowly drive the armature
of the motor. When the armature is rotating, the voltage reading should change from 0V to
approximately 4.85V. In each round the motor armature rotates, the voltage reading will change
from 0V to 4.85V and 0V for 4 times.
NOTE: 4.85V is a approximate reading of voltage. The actual reading may range between 4.50V
and 5.00V.
6.2 The speed sensor should be replaced in the following cases:
• No voltage reading is displayed;
• The voltage reading is no greater than 3.50V;
• No voltage reading change when the motor is running.
Check Procedure 9—forward/reverse gear switch
Please refer to Chapter 1 “Protection for Electrical Safety”.
1. Disconnect the battery cable according to the directions. Please refer to Chapter 1 “Protection for
Electrical Safety”.
2. Disconnect the 3 wires from the gear switch. Use a multimeter set at 200
Ω
,connect the black (-)
probe to Position 7 (or 8) of the gear switch, then connect the red (+) probe to Position 3 (or 4).
When the switch is on NEUTRAL or REVERSE, no continuity should be indicated. When the switch
is on FORWARD, continuity should be indicated. If the reading is not correct, replace the switch.
3. Connect the black (-) probe to Position 1 (or 2) of the gear switch, then connect the red (+) probe to
Position 3 (or 4). When the switch is on NEUTRAL or FORWARD, no continuity should be indicated.
When the switch is on REVERSE, continuity should be indicated. If the reading is not correct,
replace the switch.
Check Procedure 10—Reverse buzzer
1. Disconnect the battery cable according to the directions. Please refer to Chapter 1 “Protection for
Electrical Safety”.
2. Remove screws on each side of the instrument panel
3. Pull out the instrument panel along the driving handle.
4. Disconnect the brown/yellow wire and the red wire from the reverse buzzer. Make sure that the
terminal on the key switch will contact the frame.