F-14
TROUBLESHOOTING & REPAIR
F-14
POWER-ARC 4000
TEST PROCEDURE
1. Conduct the test with the gasoline
engine OFF.
2. Remove the spark plug wire to pre-
vent accidental engine kickback or
starting.
3. Isolate the rotor electrically by
removing the generator brushes.
Refer to Figure F.2 as you perform
the remaining steps.
4. Open the brush holder assembly
cover. Squeeze the 2 tabs and
depress the cover at the top with a
screw driver or your fingernail. The
cover will drop open on its bottom
hinge.
5. With the 1/4” nut driver, remove the
2 screws that hold the brush holder
assembly in place.
6. Slide the brush holder assembly out
and lay it aside, held by the 2 wires
attached.
7. Measure the resistance across the
rotor slip rings.
A. Set the ohmmeter on the low
scale (X1).
B. Place one meter probe on one
of the rotor slip rings. Place
the other probe on the other
slip ring.
C. Check the resistance across
the slip rings. It should read 8 -
9 ohms.
8. Measure the resistance to ground.
A.. Set the ohmmeter on the high
scale (X100,000).
B. Place one probe on either of
the slip rings. Place the other
probe on any good, unpainted
ground. Use the ground stud
or the rotor thru-bolt.
C. Check the resistance. It should
read very high, at least .5
megohm (500,000 ohms).
If the resistance checks meet the spec-
ifications, then the rotor is okay.
ROTOR RESISTANCE TEST
(continued)
FIGURE F.2
LOCATION OF ROTOR SLIP RINGS - BRUSH HOLDER ASSEMBLY REMOVED
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SLIP
RINGS
