CG125 Motorcycle Solo Switch Wholesale Motorcycle Spare Parts

Solo Switch CG125 Motorcycle Parts Lgnition Coil Spare Parts

Product Details
Place of Origin: China
Model: CG125 Solo Switch

Payment & Shipping Terms

Comprehensive analysis of motorcycle relays

1. Basic concepts and core functions
The motorcycle relay is essentially an **electromagnetic switch element**, which controls the on and off of the high-current circuit through a small current, plays a role in protecting the circuit and simplifying the operation. Its core functions are:
Current amplification: Use low-power control signals (such as switch buttons) to control high-power loads (such as starting motors, headlights) to prevent the button contacts from being burned due to high current.
Circuit protection: When the load is overloaded or short-circuited, the relay can cut off the circuit through its own structure (such as contact disconnection) to prevent line damage.
Logic control: Realize the linkage control of multiple circuits (such as cutting off part of the load at startup to avoid voltage drops).

2. Structure and working principle
1. Typical structure
Electromagnetic system: It includes a coil, an iron core and an armature. When the coil is energized, it generates a magnetic field to attract the armature.
Contact system: It is divided into normally open contacts (normally open, closed after power on) and normally closed contacts (normally closed, disconnected after power on), usually made of silver alloy, with good conductivity and wear resistance.
Shell: mostly made of plastic, with waterproof and dustproof functions. Some high-end models use metal shells to enhance heat dissipation.

2. Working principle
When the rated voltage (such as 12V) is applied to the coil, the electromagnetic force attracts the armature, drives the contacts to close (or disconnect), and connects (or disconnects) the main circuit; after power failure, the armature returns to its original position under the action of the reset spring, and the contacts return to normal.

III. Key parameters and performance indicators
Rated voltage: commonly 12V (mainstream motorcycles), some models (such as large cruisers) may use 24V.
Contact load capacity: refers to the maximum current that the contact can safely carry (such as "30A/12V"), ​​which needs to match the load power (power = voltage × current).
Response time: the time from the coil being energized to the contact being fully closed. The response time of a high-quality relay is less than 50ms to ensure control sensitivity.
Temperature range: generally -30℃~+80℃, and relays installed near the engine need to withstand higher temperatures (such as +125℃).

5. Installation and maintenance points
1. Installation precautions
Location selection: Avoid installation in high temperature (such as near the exhaust pipe), humid or vibration-prone areas. Prefer the inside of the frame or the electrical box.
Wiring specifications: The control end (coil) is connected to the switch signal, and the main circuit end (contact) is connected to the load. The polarity must be consistent with the battery (the positive and negative poles cannot be reversed in the DC system).
Fixed method: Use bolts or buckles to fix firmly to prevent vibration from causing poor contact of the contacts.

2. Common faults and troubleshooting**
Contact burnout: It manifests as abnormal sound of the relay and inoperative load. The shell can be disassembled to observe whether the contacts are black or sticky. Fine sandpaper needs to be used to polish or replace the relay.
Coil burnout: It is mostly caused by excessive voltage or continuous power-on time for too long. The symptom is that the relay does not respond. It can be judged by measuring the coil resistance (normal resistance is about 50-100Ω) with a multimeter.
Poor contact: The load may work intermittently due to oxidation or loosening of the terminal. The terminal needs to be cleaned and the screws tightened.

VI. Upgrade and selection suggestions
High-performance relays: Use solid-state relays (no contacts) or gold-plated contact relays, which have faster response and longer life, and are suitable for modified vehicles or high-power loads (such as spotlights, electric auxiliary equipment).
Waterproof relays: The housing design with a sealing rubber ring is suitable for off-road motorcycles or riding in rainy days to prevent rain from seeping in and causing short circuits.
Selection principle: The contact load current must be greater than 1.5 times the maximum load current (such as 35W headlight current ≈ 3A, 10A relay can be selected), and the voltage is consistent with the vehicle electrical system.

VII. Linkage relationship with other components
Cooperation with fuses: The main circuit of the relay needs to be connected in series with a fuse (such as the starter relay is connected in series with a 15A fuse), which doubles the circuit protection safety.
Linkage with ECU: In electronic fuel injection models, the fuel pump relay is controlled by the ECU. When starting, it is pre-supplied for 2 seconds to ensure smooth engine ignition.
Cooperation with sensors: The cooling fan relay of some models is triggered by the water temperature sensor, and the fan is automatically started for heat dissipation when the water temperature exceeds the threshold.

Through the above analysis, we can clearly understand the functions, types and maintenance points of motorcycle relays. As the "nerve hub" of the electrical system, it is crucial to the reliability and safety of the vehicle.