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TROUBLESHOOTING & REPAIR
F-18 F-18
RANGER 8
ROTOR RESISTANCE TEST (continued)
FIGURE F.2 – LOCATION OF ROTOR SLIP RINGS
Lead 219
Lead 200A
+
-
TEST PROCEDURE
1. With the 5/16” nut driver, remove the 6
sheet metal screws from the case top.
2. Remove the rubber gasket (cover seal)
from the lift bail.
3. Remove the fuel cap. The rubber gasket
for the fill tube will come off with the case
top.
4. Remove the case top, then replace the
fuel cap.
5. With the 5/16” nut driver, remove the 5
screws holding the right case side.
6. Remove the right case side by lifting up
and out.
7. Conduct the test with the gasoline engine
OFF.
8. Remove the spark plug wires to prevent
accidental engine kickback or starting.
9. Isolate the rotor electrically by removing
the generator brush leads. Refer to
Figure F.2 as you perform the remaining
steps.
10. Remove lead 219 from the negative
brush.
11. Remove lead 200A from the positive
brush.
12. 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 between 4 and 5
ohms.