Cessna 177 SERIES Service Manual page 274

16-50.
TROUBLE SHOOTING (Cont).
TROUBLE PROBABLE CAUSE
REMEDY
FLASHING BEACON DOES
Defective wiring.
2. Test circuit until short is lo-
NOT LIGHT (Cont).
cated. Repair or replace wiring.
Lamp burned out.
3. Test lamp with ohmmeter or
a new lamp. Replace lamp. If
lamp is good, proceed to step 4.
Open circuit in wiring. 4. Test circuit from lamp to
flasher for continuity. If no
continuity is present, repair or
replace wiring.
If continuity is
present, proceed to step 5.
Defective switch. 5. Check voltage at flasher with
master and beacon switch on.
Should read battery voltage.
Replace switch. If voltage is
present, proceed to step 6.
Defective flasher. 6. Install new flasher.
FLASHING BEACON
Defective flasher. 1. Install new flasher.
CONSTANTLY LIT.
1. Inspect circuit breaker. If
ALL NAV LIGHTS OUT.
Short circuit in wiring.
circuit breaker is open, proceed
to step 2. If circuit breaker is
OK, proceed to step 3.
Defective wiring. 2. Isolate and test each nav light
circuit until short is located.
Repair or replace wiring.
Defective switch.
3. Check voltage at nav light with
master and nav light switches on.
Should read battery voltage. Re-
place switch.
ONE NAV LIGHT OUT. Lamp burned out. 1. Inspect lamp. Replace lamp.
Open circuit in wiring. 2. Test wiring for continuity.
Repair or replace wiring.
ONE ANTI-COLLISION Flash tube burned out. Test with new flash tube. Replace
STROBE LIGHT WILL flash tube.
NOT LIGHT. THRU
1972 MODELS.
Faulty wiring.
Test for continuity. Repair or
replace.
Faulty trigger head. Test with new trigger head.
Replace trigger head.
BOTH ANTI-COLLISION
Circuit breaker open.
Inspect. Reset.
STROBE LIGHTS WILL
NOT LIGHT. THRU
1972 MODELS.
Change 3 16-15