Yamaha YZF-R125 Service Manual: 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 ( × 1) and battery (12 V) to the relay terminal as shown.

Check the relay operation.

Out of specification →  Replace.

Starter relay

Starter relay


1. Positive battery terminal

2. Negative battery terminal

3. Positive tester probe

4. Negative tester probe


Starting circuit cut-off relay

Starting circuit cut-off relay


1. Positive battery terminal

2. Negative battery terminal

3. Positive tester probe

4. Negative tester probe


Headlight relay

Headlight relay


1. Positive battery terminal

2. Negative battery terminal

3. Positive tester probe

4. Negative tester probe


Radiator fan motor relay

Radiator fan motor relay


1. Positive battery terminal

2. Negative battery terminal

3. Positive tester probe

4. Negative tester probe


    Checking and charging the battery
    WARNINGBatteries generate explosive hydrogen gas and contain electrolyte which is made of poisonous and highly caustic sulfuric acid. Therefore, always follow these preventive mea ...

    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 poc ...

    Other materials:

    Checking the cooling system
    1. Remove: Side covers Upper side cowlings Refer to "GENERAL CHASSIS" on page 4-1. 2. Check: Radiator "1" Radiator inlet hose "2" Radiator outlet hose "3" Coolant reservoir hose "4" Water pump breather hose "5" Cracks/damage → Replace. Refer to "RADIATOR" on page 6-1 ...

    Checking the shift shaft
    1. Check: Shift shaft Bends/damage/wear Replace. Shift shaft spring Damage/wear Replace. Checking the stopper lever 1. Check: Stopper lever Bends/damage Replace. Roller turns roughly Replace the stopper lever. Stopper lever spring Damage/wear Replace. ...

    Be a Responsible Owner
    As the vehicle's owner, you are responsible for the safe and proper operation of your motorcycle. Motorcycles are single-track vehicles. Their safe use and operation are dependent upon the use of proper riding techniques as well as the expertise of the operator. Every operator should ...

    2025 Copyright www.yam-r125.net |