Shandong Shengyue Technology Development Co.,Ltd is one of the most professional sinotruk howo main power switch wg9725764001 37360010040 manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.
SINOTRUK HOWO Main power switch WG9725764001 37360010040 FAW 3736010-82T/C 3736010-61B/C 373AA00026 SHACMAN 81.25506.6033
Core Operational Logic
1. Delayed Shutdown Mechanism: After the driver turns off the ignition, the urea pump in the after-treatment system must continue operating for 2–3 minutes to fully evacuate residual urea solution from the lines back into the urea tank (preventing crystallization and line blockages in cold weather).
2. Control Sequence: Ignition turned off → ECU commands the main power switch to remain energized → Urea pump completes line evacuation → ECU cuts power to the main switch coil → Main switch solenoid (3736010-82T/C) automatically disengages, completely cutting off power to the vehicle.
3. Technical Warning: If the driver disconnects the main power cable near the battery box immediately after shutdown for convenience, or if the main switch coil loses power abnormally due to a fault, the urea pump will fail to evacuate the lines. This frequently leads to crystallization and seizing of the urea system (on China VI/V vehicles), exhaust system fault codes, and even engine power derating.
Common Failures
1. Power remains on after turning off the key (contact adhesion): Because the total current draw is extremely high when the air conditioning, parking heater, and headlights are all in use, the internal heavy-duty copper contacts are prone to arcing (sparking) the moment they disconnect. Over time, the contacts can "weld" together and jam, causing the power cutoff function to fail and rapidly draining the battery.
2. Total loss of vehicle power (dashboard remains dark): When attempting to start the vehicle, if there is no audible, loud "clunk" (solenoid engagement sound) from the battery box area and the vehicle has no power at all, the issue is usually a burnt-out internal control coil or a corroded/broken connector, preventing the main contacts from closing and supplying power.
3. Emergency "jumper" method: If a truck breaks down on the road due to a failed master switch and a total loss of power, a common emergency workaround used by drivers is to bridge the two thickest terminal studs on the back of the master switch using a heavy copper wire or a wrench; this forces the vehicle to power up so it can be driven to a service station.
DETAILS
| DESCRIPTION | Main power switch | PART NUMBER | WG9725764001 37360010040 |
| WEIGHT | 0.75kg | VOLUME | 70 mm × 60 mm × 80 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 |
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