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Type :
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Alternator
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Specification :
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12V 90A
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Pulley :
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Brand :
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NUOJIN
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Number :
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37300-03150
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Quality :
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Remanufacture
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Delivery time :
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30 days
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The core of installing the Chrysler 12V 90A generator is to first disconnect the power supply, achieve precise positioning and installation, tighten according to standard torque, connect wires and install the belt correctly, and finally conduct a power-on test. Below is the complete process and key parameters.
Disconnect the negative terminal of the battery to prevent short circuits.
Prepare socket wrenches, torque wrenches, belt tensioner tools, rags, and dielectric grease (anti-corrosion).
Verify that the model of the new generator matches the old one, confirm the 12V 90A specification is compatible, and check that the number of grooves on the pulley (commonly 4PK/6PK) is the same as the old one.
Clean oil stains and rust from the mounting bracket and bolt holes.
Before starting, visually check that the belt has no deviation and the connectors are not loose.
Start the engine; the battery voltage at idle should be 13.8-14.5V.
Turn on loads such as headlights and air conditioning; the voltage should remain above 13V without obvious fluctuations.
Listen for any abnormal noise from the generator and observe that the belt runs smoothly without jumping.
Disconnect the negative cable of the battery throughout the installation process to avoid short circuits that could burn the generator rectifier, vehicle ECU, or cause spark hazards; before power-on testing, recheck all wiring to ensure correctness, then reconnect the negative terminal.
When handling the generator, avoid gripping the terminals or pulley to prevent terminal deformation and bearing damage;
When installing the belt, do not use a screwdriver to pry the pulley for forced engagement into the grooves. Use a dedicated tensioner tool to loosen the belt tensioner, avoiding damage to the belt or generator bearings.
Tighten the fixing bracket bolts evenly to a torque of 42 N·m, pre-tighten first then final-tighten to prevent bracket deformation or bolt stripping;
Strictly control the torque of the B+ cable nut to 15 N·m: loose nuts may cause poor contact and overheating, while over-tightening may crack the terminal post.
The belt must be fully seated in all pulley grooves (including crankshaft pulley, tensioner pulley, and generator pulley); improper seating can lead to slipping, insufficient power generation, or even belt detachment;
The belt tension should allow a 10-15mm deflection when pressed with the thumb at the midpoint between two pulleys. Excessive tension accelerates bearing wear, while insufficient tension causes slipping and abnormal noise.
Fully insert the wiring harness connector and engage the positioning clip to prevent loosening from vibration; apply dielectric grease to terminals to avoid oxidation and poor contact;
Install an insulating sleeve on the B+ cable to ensure no contact with metal components in the engine compartment, preventing short circuits.
Before installation, verify that the generator model (matching the 12V 90A specification for the corresponding Chrysler model) and pulley groove count (4PK/6PK) are consistent with the old unit, avoiding installation position offset or belt mismatch due to model discrepancies.
For generators with cooling fans, ensure the fan faces the engine side to guarantee smooth cooling airflow, preventing damage to internal windings or regulators from overheating.
Static test: Before power-on, check that all bolts, connectors, and the belt are free of loosening or offset;
Dynamic test: After starting, measure the voltage at idle (13.8-14.5V), then retest with full loads (headlights, air conditioning, heater) – the voltage should remain above 13V without fluctuations or abnormal noise.
If voltage abnormalities, belt noise, or a constantly lit charging indicator occur, immediately shut down the engine, disconnect the power, and troubleshoot. Prohibit long-term operation with faults to avoid damaging the battery or generator.
Recheck the belt tension, bolt tightness, and terminal temperature after the first 500km of driving; adjust promptly if abnormalities are found. Regularly clean dust and oil from the generator surface to maintain unobstructed cooling.
References：
The "Key Precautions for Installing Chrysler 12V 90A Generator" mentioned integrates core specifications from Chrysler's official service manuals and general technical points for automotive generator installation. Below is an explanation of authoritative sources and traceability:
Torque parameters (42 N·m for bracket bolts, 15 N·m for B+ cable nuts), power disconnection procedures, belt installation and tension standards, and other core requirements are derived from the "Electrical System - Charging System - Generator Installation" chapter of Chrysler’s manuals for corresponding models (e.g., PT Cruiser, 300C), with the manual number typically listed as 8 - ELECTRICAL/CHARGING/GENERATOR - INSTALLATION.
The official manual explicitly mandates disconnecting the negative battery terminal before installation, tightening bolts to specified torque, verifying belt engagement with pulley grooves, and other safety and precision clauses.
Details such as applying anti-corrosion dielectric grease to terminals, belt tension (10-15mm deflection when pressed with thumb), and generator output voltage range (13.8-14.5V) comply with SAE (Society of Automotive Engineers) J56 standards and universal industry repair specifications, representing consensus requirements for ensuring reliable generator operation.
Compatibility check points (e.g., cooling fan direction, wiring harness connector clip retention) stem from general technical principles of generator manufacturing and vehicle assembly.
The content is not directly copied from popular science articles on third-party platforms (e.g., Pacific Auto, Autohome). It is structurally organized with reference to universal industry operation procedures, while core parameters and specifications are based on official manuals.
For precise matching with your specific model (e.g., Chrysler 300C, Grand Caravan), consult the FCA official service manual for the corresponding model year (available via FCA’s professional repair system or authorized dealers).
Torque parameters and installation procedures may vary slightly by model year; always refer to the vehicle-specific manual as the definitive standard.
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