Motor Start ECU Relay 3735970LD300 for JAC L22719 Truck — Verified OEM Direct-Fit Starter Control Relay
Key Attributes
Product Summary
Verified OEM direct-fit 12V starter relay for JAC L22719 trucks. Features silver alloy contacts, UL94 V-0 flame-retardant housing, and ISO 7588 compliance. Plug-and-play design ensures reliable cranking from -40°C to +85°C. Wholesale supply available.
Product Details
Motor Start ECU Relay 3735970LD300
,JAC L22719 Truck Starter Control Relay
,Verified OEM Direct-Fit Starter Relay
Motor Start ECU Relay 3735970LD300 for JAC L22719 light trucks — a verified direct-fit, 12V starter control relay with bench-tested switching performance, built for reliable engine cranking and available for wholesale supply.
The Motor Start ECU Relay with OEM number 3735970LD300 is a verified direct-fit replacement for JAC L22719 trucks equipped with a 12V electrical system. It is a critical control component in the engine starting circuit, responsible for switching the high-current starter solenoid signal on command from the ECU, ensuring reliable engine cranking.
How it works: The ECU sends a low-current control signal to the relay coil; the relay closes its high-current contacts to energize the starter solenoid, which engages the starter motor. A failed relay causes no-crank, intermittent crank, or a starter that stays engaged.
- Real bench test data: Coil pull-in voltage [insert verified value, e.g., ≤7.2V], contact load 12V DC / [insert rated current, e.g., 30A] — verified via in-house bench test over [insert cycles] switching cycles (no sticking, no contact welding).
- Proven durability: Rated for ≥[insert cycles, e.g., 100,000] switching cycles — based on accelerated laboratory aging tests.
- Installation success rate: [insert %, e.g., 100%] plug-and-play fitment, no wiring modification — confirmed across [insert number] repair orders for JAC L22719.
- OEM cross-reference verified: Directly replaces OEM 3735970LD300; compliant with ISO 7588 automotive relay standard.
- Material verification: Housing flame-retardant rated UL94 V-0 — verified by [insert test method/report].
- Engine does not crank when the key is turned (no starter click)
- Intermittent no-crank, especially in hot or humid conditions
- Starter stays engaged after engine start
- Relay clicking but no starter action
- Blown starter circuit fuse due to contact failure
OE Cross-Reference: 3735970LD300 (primary); [insert any alternative/cross-brand numbers if available].
| Part Number | 3735970LD300 |
|---|---|
| Product Name | Motor Start ECU Relay |
| Car Model | JAC L22719 Truck |
| Engine Model | JAC L22719 Truck |
| Condition | 100% Brand New |
| Size | — |
| Weight | Standard |
| Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe |
| Package | Neutral Packing Or Make It As Requested |
| Warranty | 6 Months |
| Price & Stock | Please Contact Us To Get More Information |
| Material | High-strength aluminum alloy & precision bearings |
| Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement |
| Quality Standard | OEM equivalent / ISO quality control |
| Feature | Benefit + Verification Signal |
|---|---|
| OEM-matched fitment | Direct replacement for OEM 3735970LD300 — no adapter or modification required |
| Silver alloy contacts | Low contact resistance and arc erosion resistance — verified by [insert cycles]-cycle bench test with no welding |
| Flame-retardant housing (UL94 V-0) | Safe operation under high temperatures — verified by +85°C thermal aging test |
| Plug-and-play direct-fit design | No wiring modification, reduced labor time — [insert %] installation success rate across [insert number] repair orders |
| ECU-compatible coil | Stable pull-in/release, no false triggering — verified by [insert test method] |
| Sealed dust-proof construction | Reliable in dusty/humid conditions — verified by [insert dust/ingress test method] |
| Brand | Model | Engine Code | Notes |
|---|---|---|---|
| ISUZU | FSR / FSR 500 | 6HE1 | Primary fitment per OEM number |
| ISUZU | FVR / FTR | 6HE1 (verify) | Some cross-applications reported; confirm by VIN |
⚠️ Important fitment notes:
HDA-008 / MC828264 are aftermarket cross-reference numbers, primarily appearing in Mitsubishi Fuso brake booster catalogs. This product is primarily oriented toward ISUZU FSR 6HE1 fitment; the above numbers are listed for customer cross-comparison.
If your vehicle is a Mitsubishi Fuso FK/FM with an MC828264 booster, confirm pushrod length and mounting bolt pattern match before ordering. Both "short" and "long" pushrod variants exist within the MC828264 family.
Always provide the VIN/chassis number for verification. Do not rely solely on cross-reference numbers.
| QC Item | Verification Method |
|---|---|
| Contact switching test | [insert cycles] cycles, monitored for sticking/welding |
| Rated current load test | [insert rated current]A @ 12VDC continuous load aging |
| Coil pull-in/release voltage test | Bench test against OEM specification |
| Thermal cycling test | -40°C to +85°C temperature shock test |
| Housing flammability test | UL94 V-0 standard |
| Visual & dimensional inspection | Caliper/visual check, 100% factory inspection |
| Relay standard compliance | ISO 7588 |
- Disconnect the battery negative terminal.
- Locate the original starter/ECU relay in the fuse/relay box (refer to vehicle manual).
- Remove the old relay and verify the pin configuration matches the new unit.
- Insert the new relay fully into position (no force; confirm terminal alignment).
- Reconnect power and test engine cranking and starter disengagement.
Maintenance schedule: Inspect relay contact condition every 2 years or 50,000 km. If no-crank symptoms occur, check the relay, starter solenoid, and battery first.
- Individually packed in an anti-static bag with foam protection; custom packaging available [insert MOQ].
- Suitable for: auto parts wholesalers, repair shops, and fleet procurement.
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