Chevrolet 1977 light duty truck, Service Manual

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T R O U B L E C H A R T - W IP E R D E T A C H E D (C O N T .)
Trouble Description Check Items shown in views opposite trouble description
(2) Wiper w ill not shut o ff and
(a) Wiper has both LO and HI
Speeds. Check Items (1)
and (2).
(b ) Wiper has LO Speed O nly.
Check Items (3) and (4).
(c) Wiper has HI Speed Only.
(Shunt field c irc u it open)
Refer to trouble condition
"W iper Inoperative" and
check Items 1, 2 (b), 4 and
5.
(3) Wiper has " H I " Speed Only
Refer to view opposite trouble co ndition "W iper In ­
operative" and check Items 1, 2 (b), 4 and 5.
(4) Wiper has " L O " Speed O nly
See Trouble Description 2 (b).
(5) Wiper Gear and/or crank arm
does not park correctly. Wiper
gear and/or crank arm stops
r o t a t in g im m ediately when
wiper m otor is shut o ff.
Check fo r bent, damaged or d irty park switch contacts. See
Item (1) in view opposite T rouble D escription No. 2 "W iper
w ill not shut " O f f" .
(6) Wiper Speed Excessive in Hi
Speed Mode
(Crank arm or gear rotation
exceeds 80 RPM)
Open resistor on back o f wiper term inal board.
(1) S w itch C ontacts not o pening
(2) B lack Cotten Covered Lead
to No. 1 T e rm in a l g rounded
(3 ) Black P lastic Covered Lead
to No. 3 T e rm in a l grounded
(4 ) Grounded Field Coil -
See CHECKING THE
FIELD COIL',