Cessna 150 Series Service Manual page 201

16-46. AIRCRAFT LIGHTING SYSTEM.
anti-collision strobe lights, flashing beacon light,
dome and instrument flood lights, control wheel map
16-47. DESCRIPTION. The aircraft lighting systems light, compass and radio dial lights.
consists of landing and taxi lights, navigation lights,
16-48. TROUBLE SHOOTING.
TROUBLE
PROBABLE CAUSE
REMEDY
LANDING AND TAXI LIGHT(s)
Short circuit in wiring.
1. Inspect circuit breaker. If
OUT.
open, proceed to step 2. If OK,
proceed to step 3.
Defective wiring.
2. Test each circuit separately
until short is located. Repair
or replace wiring.
Defective switch. 3. Check voltage at lights with
master and landing and taxi light
switches ON. Should read bat-
tery voltage. Replace switch.
LANDING AND/OR TAXI
Lamp burned out. 1. Test lamp with ohmeter or
LIGHT OUT.
new lamp. Replace lamp.
Open circuit in wiring. 2. Test wiring for continuity.
Repair or replace wiring.
FLASHING BEACON DOES
Short circuit in wiring.
1. Inspect circuit breaker. If
NOT LIGHT.
open, proceed to step 2. If OK,
proceed to step 3.
Defective wiring.
2. Test circuit until short is lo-
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.
16-15