Ultra motor A2B Metro, Service Manual

Page: 45 / 48

7-5
ELECTRICAL
Motor Troubleshooting
Perform the following if the motor does
not operate when the throttle is applied.
1. Perform the motor input voltage test.
a. If the voltage equals 36 volts, the motor
is faulty. Replace the wheel.
b. If the voltage is below 30 volts, the bat-
tery is undercharged. Charge the battery
and retest.
c. If the voltage is 0 volts, proceed to Step
2.
2. Perform the key switch test.
a. If the switch does not have continuity
on the A side, replace the key switch.
b. If the switch has continuity on the A
side, proceed to Step 3.
3. Disconnect each brake switch connec-
tor (A,
Figure 1 ). Turn the key switch to A,
and operate the throttle.
a. If the motor operates, one or both
brake switches are faulty. Perform the
brake switch test to identify a faulty switch.
Replace a brake lever with a faulty
switch.
b. If the motor does not operate, pro-
ceed to Step 4.
4. Perform the relay test.
a. If the relay clicks, it is good. Replace
the throttle.
b. If the relay does not click, it is faulty.
Replace the switch module.
3. Check the continuity by performing the
following:
a. Connect one ohmmeter test probe to
the red wire in port side of the charger-port
connector, and connect the other test
probe to the terminal No. 1 on the port.
Continuity should be present.
b. Connect one ohmmeter test probe to
the black wire in the port side of the char-
ger-port connect, and connect the other
test probe to terminal No. 2 on the port.
Continuity should be present.
4. If continuity is not present during each
portion of the test, there is a break in the
wire between the charger port and its
connector. Locate and repair the open or
replace the charger port and its wiring.
Battery Undercharged
1. Perform the charger port test described
in this chapter. Replace the port if it is
faulty.
2. Charge the battery as described in this
chapter.
3. Remove the battery cap, and discon-
nect the battery connector for the affect-
ed battery (Main battery: B,
Figure 1
; auxil-
iary battery: C).
4. With the key switch off, measure the
voltage across the black and red terminals
in the battery side of the connector. The
meter should read 36 volts or higher. Record
the reading
5. Wait an hour and retest the battery volt-
age. The battery is faulty if the voltage is
less than the reading taken earlier.