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SR
LAMPS
8L - 3
DIAGNOSIS AND TESTING {Continued)
F O i LAMP DiAONOSiS
The fog l a m p system can be activated when the
low-beam headlamps are t u r n e d O N . The high-beam
headlamp dimmer switch when actuated cancels out
voltage feed to the fog lamp circuit. The fog lamp cir-
cuit is protected by a 20 amp fuse located i n the fuse
panel. Refer to Group 8W, W i r i n g Diagrams, for com-
ponent location and circuit information.
F O G LAMP
DIAGNOSIS
C O N D I T I O N
P O S S I B L E C A U S E S
C O R R E C T I O N
F O G L A M P S A R E D I M
W I T H E N G I N E I D L I N G O R
I G N I T I O N T U R N E D O F F .
1. Loose o r c o r r o d e d battery c a b l e s .
2. L o o s e or w o r n generator drive
belt.
3. C h a r g i n g s y s t e m output t o o low.
4. Battery h a s insufficient c h a r g e .
5. Battery is sulfated or s h o r t e d .
6. Poor lighting circuit Z 1 - g r o u n d .
7. Both f o g l a m p bulbs defective.
1. C l e a n a n d s e c u r e battery c a b l e c l a m p s
a n d posts.
2. A d j u s t or replace generator drive belt.
3. Test a n d repair c h a r g i n g s y s t e m . Refer to
G r o u p 8A,
4 . Test battery state-of - c h a r g e . Refer to
G r o u p 8 A .
5. L o a d test battery. Refer to G r o u p 8 A .
6. Test for voltage d r o p a c r o s s Z 1 - g r o u n d
locations. Refer to G r o u p 8 W .
7. R e p l a c e both f o g l a m p bulbs.
F O G L A M P B U L B S B U R N
O U T F R E Q U E N T L Y
1. C h a r g i n g s y s t e m output t o o h i g h .
2. L o o s e or c o r r o d e d t e r m i n a l s or
splices in circuit.
1. Test a n d repair c h a r g i n g s y s t e m . Refer t o
G r o u p 8 A .
2. Inspect a n d repair all c o n n e c t o r s a n d
splices. Refer to G r o u p 8 W .
F O G L A M P S A R E D I M
W I T H E N G I N E R U N N I N G
A B O V E IDLE
1. C h a r g i n g s y s t e m output t o o low.
2. Poor lighting circuit Z 1 - g r o u n d .
3. High resistance in f o g l a m p circuit.
4. Both f o g l a m p bulbs defective.
1. Test a n d repair c h a r g i n g s y s t e m . Refer t o
G r o u p 8 A .
2. Test for voltage d r o p across Z 1 - g r o u n d
locations. Refer to G r o u p 8 W .
3. Test a m p e r a g e d r a w of f o g lamp circuit.
4. R e p l a c e both f o g l a m p bulbs.
F O G L A M P S F L A S H
R A N D O M L Y
1. Poor lighting circuit Z 1 - g r o u n d .
2. High resistance in f o g lamp circuit.
3. Faulty f o g l a m p s w i t c h .
4. L o o s e or c o r r o d e d terminals or
splices in circuit.
1. Test for voltage d r o p a c r o s s Z 1 - g r o u n d
locations. Refer to G r o u p 8 W .
2. Test a m p e r a g e d r a w of f o g l a m p circuit.
3. R e p l a c e f o g l a m p s w i t c h .
4. Inspect a n d repair all c o n n e c t o r s a n d
splices. Refer to G r o u p 8W.
F O G L A M P S D O N O T
I L L U M I N A T E
1. N o v o l t a g e t o f o g lamp(s).
2. N o Z 1 - g r o u n d at f o g lamps.
3. Faulty f o g l a m p s w i t c h .
4 . B r o k e n c o n n e c t o r terminal or wire
splice in f o g l a m p circuit.
1. Repair o p e n in t h e f o g l a m p circuit. Refer
to G r o u p 8 W .
2. Repair circuit g r o u n d . Refer to G r o u p
8W.
3. R e p l a c e f o g lamp s w i t c h .
4. Repair connector terminal or wire splice.
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Table of Contents
Troubleshooting
