Buick LeSabre 1965 Service Manual page 678

1 0 - 1 0 8 TROUBLE SHOOTING
ELECTRICAL SYSTEMS
TROUBLE CHART—WIPER OUT OF CAR (Cont'd.)
9. No
test
car
TROUBLE
apparent trouble on bench
but fails occasionally on
2.
1.
2.
3.
POSSIBLE CAUSES USE CHECKING PROCEDURE
Circuit breaker tripping be-
cause of shorted armature
and/or fields causing motor to
draw excessive current
Armature end play tight See adjustments Section
Gear assembly end play tight
Loose solder or weld joints
to relay switch terminal as shown
in Figure 10-116.
(1) Test Lamp Lights. Circuit
from Terminal No. 2 through cir-
cuit breaker to relay - switch
O.K.
(
2
) Test Lamp Doesn't Light.
Circuit breaker or solder con-
nections at c i r c u i t breakers
defective.
(d) To determine if relay coil is
open connect test lamp to wiper
Terminal No. 1, Figure 10-116.
If lamp doen't light, coil is open
or solder connection to No. 1
Terminal is defective.
(e) Test relay switch as follows:
If gear mechanism is in full park
position, use a small screwdriver
in the switch slot and push latch
arm down toward relay coil. See
Figure 10-116. Next, remove a
small amount of insulation from
black lead with pink tracer and
touch test lamp to exposed wire.
(1) Test lamp lights but motor
doesn't run - proceed to Step (f).
(2) Test lamp doesn't
Relay-switch defective.
light -
DASH SWITCH- HI SPEED
OFF LO HI
IFOJIT BREAKER
BLACK WITH WHITE STRIPE
Series Field & Arm
Shunt Field
RELAY SWITCH CONTACTS
MJTOR SECTION
Figure 10-112—Wiring Diagram - High Speed Operation