TROUBLESHOOTING & REPAIR
F-36 F-36
RANGER 305D
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ENGINE ALTERNATOR TEST (continued)FIGURE F.8– LEAD LOCAIONS
OILPRESSURE SWITCH
BATTERY
IGNITION
209
210
TEST PROCEDURE
1. Turn the engine off.
2. Open the engine access door and check the
voltage at the battery terminals. It should be
approximately 12 volts DC.
3. Attach the meter leads to the battery termi-
nals, being careful to position them so they
stay clear of moving parts while the engine is
running.
4. Placethe idle switch in the “HIGH IDLE”posi-
tion, start the engine, and allow it to run at
high idle speed for about 15 to 30 seconds.
5. The meter should read about 13.7 to 14.2
VDC.
6. If the meter reads correctly the engine alter-
nator is producing adequate power to charge
the battery and this test is complete.
6. If the voltage is significantly higher than the
above values, the alternator is not properly
regulating the battery charging voltage and
should be replaced. If the voltage reads the
same or less than the measurement taken
when the engine was not running, proceed
with the following tests.
7. Turn off the engine, disconnect the meter
from the battery,and open the engine access
door on the left side of the machine.
8. Make sure the idle switch is still in the “high”
position, start the engine, and allow it to run
athigh idle speed for about 15 to 30 seconds.
9. Place the negative meter probe on a good
chassis ground, or the negative battery termi-
nal. Place the positive meter probe on the
battery terminal on the back of the alternator.
(Lead #209) See Figure F.8. See Wiring
Diagram.
10. The meter should read about 13.7 to 14.2
VDC.
11. Move the positive probe to the IGN terminal
on the back of the alternator. (Lead @210C)
See Figure F8.
12. The meter should read about 13.7 to 14.2
VDC.
13. If the meter reads correctly, check the con-
nections between the alternator and the bat-
tery. See wiring diagram.
14. If the voltage at both of the above test points
reads the same or less than the battery volt-
age measurement taken when the engine
was not running, the alternator is defective.
Repair or replace it.
15. If battery voltage is present at the battery ter-
minal of the alternator, but not at the “IGN”
terminal; check the run/stop switch and the
wiring connecting the “IGN” terminal to the
switch. See Figure F8.