SOLENOID SWITCH 10520731，1114593、1114599、10475646、93740999

• Disconnect the negative battery cable to avoid short - circuits or electric shocks during the installation process.

• Prepare suitable tools, such as a 12mm box - end wrench and a 10mm wrench.

• Align the push - rod of the movable iron core of the solenoid switch with the upper end of the shift fork of the starter drive end - cover.

• Then install the solenoid switch onto the starter housing and tighten the fixing nuts. Generally, the solenoid switch assembly has two or three fixing nuts, which are tightened with a 10mm wrench. Pay attention to the appropriate tightening torque of the nuts to avoid over - tightening or under - tightening.

• According to the markings on the terminals of the solenoid switch, connect the wires of the motor to the corresponding terminals. Usually, there are terminals such as B (or 30), M (or C), and S (or 50) on the solenoid switch. Ensure that the wires are firmly connected and the terminal nuts are tightened.

• Connect the wire of the starter relay to the S (or 50) starter terminal of the solenoid switch and tighten the terminal nut.

• After installation, check whether the solenoid switch is firmly fixed and whether the wires are correctly and firmly connected.

• Then reconnect the negative battery cable and test the starter. Try to start the vehicle and observe whether the starter works normally, and whether the movable iron core of the solenoid switch can push the shift fork normally to make the drive gear mesh with the flywheel ring gear.

Precautions for the 12V Chevrolet Starter Solenoid Switch

Installation Precautions

1. Terminal TorqueThe tightening torque for the solenoid switch terminal nuts is usually 14.7 to 17.7 N·m. Insufficient torque may cause loose wiring harnesses, circuit heating, and voltage drops, affecting starting performance. Excessive torque may damage the terminals.
2. Bolt Length and WashersPay attention to the length of the fixing bolts when installing the solenoid switch. Avoid using overly long bolts that could pierce the coil bobbin and cause grounding. It is recommended to use spring washers when tightening the bolts.
3. Wire ConnectionsClamp the wires of terminals B and M with two flat washers to reduce poor contact. The two fixing bolts of the solenoid switch insulation cover are prone to loosening and should be tightened during each starter maintenance.
4. Lubrication of the Movable Iron CoreApply a thin layer of engine oil to the surface of the movable iron core to reduce operating resistance. Use antifreeze oil in winter.
5. Installation Position and CenteringEnsure good positioning contact between the starter mounting surface, flange spigot, and the engine block or transmission mounting surface—no oil stains or rust allowed. When installing the fixing screws, tighten them alternately to avoid installation center deviation.

Usage Precautions

1. Starting OperationRelease the key promptly after starting the engine to prevent the solenoid switch from working for an extended period, which shortens its service life. The normal operating time of the starter is 1.5 to 2 seconds per start, with a maximum of 5 seconds. If the engine fails to start within 5 seconds, interrupt the start and try again after a 20 to 30-second interval. If it still fails to start after 3 attempts, inspect the circuit or engine for faults.
2. Power Supply VoltageEnsure the battery voltage is sufficient before starting—generally, it should be above 12V (not less than 12.14V). If the voltage is lower than this value, charge the battery to the normal voltage first to avoid damaging the battery and starter.
3. Circuit InspectionRegularly check the circuit connection points and plugs of the solenoid switch. Timely address rust, corrosion, or looseness to prevent circuit heating and voltage drops that affect the starter’s normal operation.
4. Avoid MisoperationDo not leave the key in the "ON" position when the engine is not in use for a long time. Before turning the ignition key to the "START" position, ensure the gearshift lever is in neutral. Do not press the accelerator pedal during ignition and starting.

References：

Professional Automotive Repair Websites

• The article How to Maintain and Service Automotive Starters on Zhipai Wang mentions precautions such as the tightening torque of the solenoid switch terminal nuts (14.7 to 17.7 N·m) and the normal operating time of the starter.

• Content like Disassembly and Assembly Steps of Automotive Starters on Pacific Auto Network also covers relevant precautions for starter installation and solenoid switches.

• Multiple articles on Autohome, such as DIY Replacement of Starter Solenoid Switch_Buick GL6 Forum - Autohome Forum and How to Maintain Automotive Starters, explain the installation and usage precautions for starter solenoid switches.

Automotive Repair Manuals

Relevant Technical Documents