Yamaha YZF-R125 Service Manual: Checking the turn signal relay

1. Check:

Turn signal relay input voltage Out of specification →The wiring circuit from the main switch to the turn signal relay coupler is faulty and must be repaired.


a. Connect the pocket tester (DC 20 V) to the turn signal relay terminal as shown.


- Positive tester probe 
brown "1"

- Negative tester probe 
ground


b. Set the main switch to "ON".

c. Measure the turn signal relay input voltage.

2. Check:

Turn signal relay output voltage Out of specification Replace.


a. Connect the pocket tester (DC 20 V) to the turn signal relay terminal as shown.


Positive tester probe 
brown/white "1"

Negative tester probe
ground


b. Set the main switch to "ON".

c. Measure the turn signal relay output voltage.

    Checking the relays
    Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, replace the relay. 1. Disconnect the relay from the wire harness. 2. Connect the pocket tester ( ...

    Checking the diode
    1. Check: Diode Out of specification Replace. NOTE: The pocket tester or the analog pocket tester readings are shown in the following table. a. Disconnect the diode from the wire harness. ...

    Other materials:

    Checking the fuel sender
    1. Drain the fuel from the fuel tank. 2. Check: Fuel sender resistance Out of specification → Replace the fuel sender. a. Connect the pocket tester ( × 10) to the fuel sender coupler as shown. Positive tester probe sky blue "1" Negative tester probe orange/white " ...

    Checking the starter motor
    1. Check: Commutator Dirt Clean with 600 grit sandpaper. 2. Measure: Commutator diameter "a" Out of specification Replace the starter motor. 3. Measure: Mica undercut "a" Out of specification Scrape the mica to the proper measurement with a hacksaw blade ...

    Checking the switches
    1. Clutch switch 2. Main switch 3. Front brake light switch 4. Sidestand switch 5. Rear brake light switch 6. Neutral switch 7. Turn signal switch 8. Horn switch 9. Dimmer switch 10.Pass switch 11.Engine stop switch 12.Start switch Check each switch for continuity with the pocket tes ...

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