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SINOTRUK HOWO LIGHT TRUCK 24V70A Starter Relay JD285C
FUNCTION
1. Starter Motor Power Control
When the driver turns the ignition key to the "Start" position, the JD285C receives a low-current signal from the ignition switch; it instantly closes its internal contacts to complete the high-current circuit flowing from the battery to the starter motor.
Upon completion of the starting sequence, the circuit automatically disconnects to prevent the starter motor from remaining energized for prolonged periods, thereby avoiding burnout.
2. High-Current Protection Function
By utilizing a low-current signal to control the high-current circuit, the system prevents the ignition switch and wiring harness from being directly subjected to the severe current surge generated during engine startup. This effectively safeguards the starter switch, ignition key, fuses, and associated wiring, thereby extending the service life of these electrical components.
3. Reliable Starting Assurance
The system ensures that the starter motor receives an adequate and stable supply of current, enabling rapid and reliable engine starting-even under challenging conditions such as low temperatures, low battery voltage, or heavy-load operating environments.
Installation Location
Located within the relay box, fuse box, or electrical control unit installed beneath the dashboard, or in the left/right footwell.
Located within a dedicated electrical panel situated beneath the center console or beneath the driver's seat.
Performance Advantages
1. High Current-Carrying Capacity
With a rated current reaching 70A, it reliably transmits the substantial current required to start the motor, ensuring rapid engine startup even under low-temperature conditions, low battery voltage, or heavy-load scenarios-performance far superior to that of standard low-current relays.
2. Reliable Startup Response and Stability
Utilizing a control mechanism where a low-amperage signal activates a high-amperage circuit, it delivers rapid response speeds; the contact points close swiftly and stably, effectively minimizing startup delays and instances of weak starting power. The contacts are constructed from copper, offering strong resistance to electrical arcing and preventing issues such as contact welding or sparking.
3. Excellent Electrical System Protection
It effectively isolates the high-current flow between the ignition switch and the starter motor, thereby protecting critical components-such as the key switch, wiring harness, fuses, and ECU-from damage caused by high-current surges and electrical erosion. This significantly extends the operational lifespan of the entire starting circuit.
4. Exceptional Durability and Environmental Adaptability
Featuring an engineering-grade plastic housing paired with a high-strength electromagnetic coil, the unit exhibits robust resistance to vibration, high temperatures, and corrosion. Even under prolonged operation in rough road conditions, high-temperature engine compartments, or humid environments, it maintains a low failure rate and delivers an extended service life.
DETAILS
| DESCRIPTION | 4V70A Starter Relay | PART NUMBER | JD285C |
| WEIGHT |
0.25KG |
VOLUME |
80 mm × 65 mm × 55 mm |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | CABIN |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
Daily Maintenance Recommendations
| Maintenance Item | Recommended Frequency | Specific Operations | Precautions |
|---|---|---|---|
| Starting Function Test | Every time the vehicle is started or during each service | Turn the key or press the start button and observe whether the starter motor responds quickly and strongly | Pay attention to any delay, clicking sound without rotation, or weak starting |
| Appearance & Fixing Check | Every 6 months or every 10,000 km | Check whether the relay housing has cracks, heat marks, or is loose | Heating or deformation of the relay housing is usually a sign of poor contact |
| Contact Points & Pins Cleaning | Every 10,000–20,000 km or when poor contact is noticed | After disconnecting power, gently clean the pins and relay socket contacts with contact cleaner | Avoid using sandpaper to polish, to prevent metal debris causing short circuits |
| Wiring Harness & Connector Check | During each maintenance cycle | Check whether the connecting wiring harness is aged, loose, or oxidized | Clean or replace the connector promptly if oxidation is found |
| Overall Starting Circuit Check | Every 20,000 km or seasonal maintenance | Test the coordinated operation of the battery main switch, starter relay, and starter motor | Better results when checked together with FG9804761050 battery main switch |
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