12V 130A brand new alternator 1042103130 1042103131 1042103132 1042103133 2706046320

Pre-installation Preparation

1. Tools and accessories:Prepare a compatible 12V generator, socket wrenches, torque wrench, belt tensioning tool, rags, conductive paste, etc.; confirm that the new generator model matches the vehicle, and check that it has no transportation damage and the rotor rotates smoothly without jamming.
2. Safety operations:Turn off the engine and wait for it to cool down completely, then disconnect the negative battery cable to avoid short circuits and electric shocks during installation; if the vehicle is equipped with a fault self-diagnosis system, it is recommended to read the fault codes first to prevent data loss.
3. Cleaning and inspection:Use a rag to clean dust and oil stains at the generator installation position, and check if the mounting bracket is deformed or cracked. Repair or replace it if damaged.

Core Installation Steps

1. Initially fix the generator:Place the new generator stably on the mounting bracket, align with the bolt holes, and manually screw in the fixing bolts or nuts for pre-fixation. Do not tighten them temporarily to reserve space for subsequent adjustments. Torque varies by model—for example, for Toyota Land Cruiser, pay attention to the bolt torque of 39N・m, 10mm nut torque of 39N・m, and 8mm nut torque of 15.5N・m.
2. Install the drive belt:Put the belt on the generator pulley according to its original routing. For some models such as Land Cruiser, the belt tensioner can be rotated counterclockwise to install the belt—note that the pulley bolt of the tensioner may have a left-hand thread; for Toyota Corolla, the belt can be partially pried into the pulley groove first, then the large wheel is rotated to allow the belt to fully fit. After adjustment, press the middle of the belt—sinking 1-2cm is appropriate to ensure the belt fits the pulley groove without deviation.
3. Tighten the fixing parts:After confirming the belt position is correct, use a torque wrench to diagonally tighten the generator's fixing bolts according to the specified torque to avoid bracket deformation due to uneven force. For example, when installing end cover components on Toyota Yaris, the bolt torque is mostly between 1.8-5.6N・m, which needs to be matched as required.
4. Restore electrical connections:First, connect the B-pole cable of the generator, tighten the fixing nut, and apply a small amount of conductive paste to improve contact stability (the nut torque is generally about 9.8N・m); then insert the three-pole connector of the control circuit into the interface until a clicking sound is heard to confirm it is fixed in place. For models like Toyota Corolla, distinguish the pins: the B+ pin connects to the positive battery cable, the F pin connects to the regulator positive, and the E pin connects to the regulator ground. Finally, install the terminal protection cover, organize the cables, and fix them with cable clips.

Commissioning and Inspection

1. Power-on test run:Reconnect the negative battery terminal, start the engine, and observe if the charging indicator light on the instrument panel goes out. If it goes out, it indicates the generator is initially working normally; if the light stays on, check the wiring or belt installation.
2. Voltage parameter detection:Use a multimeter to measure the voltage across the battery. The voltage should be stable at 13.5-14.5V at idle, and also remain stable during acceleration. If it is lower than 13V or higher than 15V, stop the machine to check if the wiring is loose or the belt tension is appropriate.
3. Abnormality troubleshooting:Observe if there is abnormal noise during the generator's operation, check if the electrical connectors are loose or overheated, confirm the belt has no slipping, and the mounting bracket has no obvious vibration. The installation is completed if there are no abnormalities.

I. Electrical Connection Safety Precautions

1. Disconnect the negative battery terminal first throughout the process. Do not turn on the power before wiring is completed to prevent short circuits from burning the generator coil or on-board ECU.

2. Clean the B-pole terminal and control connector pins to remove oxide layers before wiring. A small amount of conductive paste can be applied to avoid overheating caused by poor contact.

3. Strictly distinguish pin functions (e.g., B+ connects to the positive battery terminal, F connects to the regulator, E connects to ground). Confirm with the vehicle wiring diagram and prohibit wrong connection or reverse connection of positive and negative poles.

4. Insert the control connector smoothly until a clicking sound is heard. Forced insertion or removal is prohibited. After installation, organize the cables and fix them with cable clips to avoid contact and wear with rotating components such as belts and fans.

II. Mechanical Installation Specifications

1. The mounting bracket must be free of deformation and cracks. Replace it first if damaged; otherwise, it will cause generator vibration, uneven belt wear, and even bearing damage.

2. Tighten the fixing bolts gradually in a diagonal sequence. The torque must strictly follow the vehicle manual (e.g., 39N・m for Land Cruiser, 1.8-5.6N・m for Yaris). Loose bolts may vibrate and fall off, while over-tightened bolts can damage the bracket threads or generator housing.

3. Install the belt strictly according to its original routing to ensure it is fully embedded in the pulley groove without distortion. The tensioner of some models has a left-hand thread, requiring reverse operation to avoid damage from forced twisting.

4. Handle the generator with care during installation. Avoid colliding with the rotor shaft and pulley to prevent displacement of internal parts or bearing damage, which will affect service life.

References：

Official Maintenance Manuals for Specific Toyota Models

Automotive Repair Knowledge Sharing Platforms

Automotive Technical Document Sharing Platforms

Automotive Technology Sharing Communities