Evinrude 4906B 4HP 1969, Owner'S Manual

Page: 207 / 422

6-18 ELECTRICAL
the field insulation is not broken. Using a
test lamp or ohmmeter, make contact with
one probe lead to the ground of the genera-
tor
frame. Make contact with the other
lead to the field terminal. If the lamp lights
or the oh mmeter indica tes continuity, the
field coils are grounded. If the location of
the ground in the field coils cannot be
determined, or repaired, the coils MUST be
replaced.
Armature Terminal Test for Ground
10-
Check to be sure the loose end of
the armature ternimal lead of the generator
is NOT grounded to the frame. Using a test
lamp or ohmmeter, make contact with one
probe lead to the armature terminal of the
generator. Make contact with the other
probe lead to a good ground on the genera-
tor frame.
If the test lamp lights or the
ohmmeter indicates continuity, the positive
terminal insulation through the generator
frame is broken down and MUST be replac-
ed.
Positive Brush Test for Ground
11- Using a test lamp or ohmmeter,
make contact with one probe lead to the
positive or insulated brush holder. Make
contact with the other probe lead to a good
ground on the generator frame. If the lamp
lights, or the ohmmeter indicates continui-
ty, the brush holder is grounded due to
defective insulation at the frame.
Field Test
12- Using a test lamp or ohmmeter,
make contact with one probe lead to the
armature stud. Make contact with the other
probe lead to the armature brush. The lamp
should light or the ohmmeter indicate conti-
nuity. If this test is not successful, check
for a poor connection between the stud and
the brush.
CLEANING AND INSPECTING
Check the ball bearing at the end of the
commutator bar. Verify that the bearing
turns free with no sign of "rough spots" or
binding. Hold the armature in one hand and