ELEC
SIGNALING SYSTEM
–
+
* 3. Voltage • Connect the pocket tester (DC 20 V) to the indicator light assembly 1 coupler. Tester (+) lead → Brown terminal 1 Tester (–) lead → White/Blue terminal 2
W/Y Br
Br W/Y
B/G Br
Br B/G
W/L Br
Br W/L
1
2
OUT OF SPECIFICATION
• Turn the main switch to “ON”. • Check the voltage (12 V). MEETS SPECIFICATION
The wiring circuit from the main switch to the bulb socket connector is faulty, repair it.
4. Diode 2
1
• Remove the diode from the coupler. • Connect the pocket tester (Ω × 1) to the diode terminals as shown. • Check the diode for continuity as follows.
L/B W/L
2
Tester (+) lead → Blue/Black terminal 1 ContinuTester (–) lead → ity White/Blue terminal 2
NOTE: When you switch the tester’s positive and negative probes, the readings in the left chart will be reversed.
Tester (+) lead → White/Blue terminal 2 No contiTester (–) lead → nuity Blue/Black terminal 1
INCORRECT
CORRECT
Replace the diode 2.
This circuit is not faulty.
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