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TROUBLESHOOTING & REPAIR
F-26 F-26
RANGER 250
FLASHING AND ROTOR VOLTAGE TEST (continued)
FIGURE F.8 – ROTOR BRUSH LEADS
SLIP RINGS
BRUSHES
LEADS
201
5H
+
-
LEADS
200A
200
TEST PROCEDURE
1. Perform the Case Cover Removal proce-
dure.
2. Set the volt/ohmmeter to the DC volts posi-
tion.
3. Test rotor voltage - static (engine stopped
but running condition simulated):
a. Connect a jumper between P51 leads
#210 and #224. See the Wiring
Diagram. This bypasses the oil pressure
switch and simulates the test with the
engine running.
b. Remove the spark plug wires, then set
the RUN/STOP switch to RUN.
c. Connect the positive meter probe to the
brush nearest the rotor lamination (leads
#200A and #200). See Figure F.8 for
location.
d. Connect the negative meter probe to the
other brush (leads #201 and #5H).
e. Measure the voltage. It should read
between 3.0 and 4.0 VDC.
f. Set the RUN/STOP switch to STOP.
Oil Pressure Switch Test
The oil pressure switch is designed to open if it
detects low or no oil pressure. If you can con-
duct the test described here in Step 3 and
obtain the 3.0 to 4.0 VDC voltage reading,
WITHOUT THE JUMPER, then the oil pressure
switch or the Battery PC board may be faulty.