Kia Forte: Engine Electrical System / Alternator

Kia Forte 2019-2022 (BD) Service Manual / Engine Electrical System / Alternator


Rated voltage
13.5V, 130A
Speed in use
1,000 - 18,000 rpm
3 (C, L, FR)
Pulley Type
OAD Pulley
Voltage regulator
IC Regulator built-in type
Regulator Setting Voltage (Internal mode)
14.55 ± 0.3V
Regulator Setting Voltage (External mode)
C - Terminal
Frequency (Hz)
Voltage (V)
High : 3.3 - 3.7
Low : 1.3 - 1.7
Signal Type
FR - Terminal
Frequency (Hz)
212 - 288
Current (mA)
2.7 - 7
Signal Type

Components and components location

1. OAD (Overrunning Alternator Decoupler)
2. Front housing
3. Front bearing
4. Stator
5. Rotor
6. Rear bearing
7. Rear housing
8. Regulator assembly
9. Through bolt
10. Rectifier assembly
11. Rear cover

Description and operation

The Alternator has eight built-in diodes, each rectifying AC current to DC current.

Therefore, DC current appears at alternator "B" terminal.

In addition, the charging voltage of this alternator is regulated by the battery voltage detection system.

The alternator is regulated by the battery voltage detection system.

The main components of the alternator are the rotor, stator, rectifier, capacitor brushes, bearings and V-ribbed belt pulley.

The brush holder contains a built-in electronic voltage regulator.

1. Brush
2. OAD (Overrunning Alternator Decoupler)
3. Rotor
4. Stator
5. Rectifier

Schematic diagrams
Circuit Diagram


COM signal - When controlling the voltage generated, the ECM sends the target voltage data to the alternator via a PWM signal.(High voltage: 4V or higher, low voltage: 2V or lower)

FR signal - The transistor activation signal inside the alternator monitors the voltage generated by the alternator to control the excitation current before it sends the FR signal to the ECM. (At certain RPM/electric loads, the FR duty can remain static. However, more often, the RPM, electric load, target voltage, etc. are always changing in the vehicle, so the FR must also change constantly)

L signal - Turns on the battery warning lamp on the dashboard when the battery charging system malfunctions. (Conditions for turning on the lamp - overcharge, over discharge, a field coil blown inside the alternator)

B+ terminal - The output voltage from the generator travels to the battery via the B+ terminal.

Repair procedures
Removal & Installation

Turn the ignition switch OFF and disconnect the battery negative (-) terminal.


Disconnect the air compressor connector (A) and the alternator connector (B), and remove the cable from alternator "B" terminal (C).

Alternator "B" terminal mounting nut :

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)


Remove the drive belt.

(Refer to Engine Mechanical System - "Drive Belt")


Remove the alternator (A).


Install in the reverse order of removal.


Remove the alternator.

(Refer to Charging System - "Alternator")


Remove the OAD (Overrunning Alternator Decoupler) cap (A).


When installing, replace with new OAD cap.


Remove the OAD(Overrunning Alternator Decoupler) pulley (A) using the special tool.


Remove the rear cover (A) after removing nuts.


Remove the mounting bolts (A) and the regulator assembly (B).


Remove the slip ring guide (A) after pulling it.


Unsolder the 3 stator leads (A).


Remove the 4 through bolts (A).


Disconnect the rotor (A) and bracket (B).


Reassemble in the reverse order of disassembly.


When reassembling OAD pulley, replace with new OAD cap.


Check that there is continuity between the slip rings (C).


Check that there is no continuity between the slip rings and the rotor (B) or rotor shaft (A).


If the rotor fails either continuity check, replace the alternator.


Check that there is continuity between each pair of leads (A).


Check that there is no continuity between each lead and the coil core.


If the coil fails either continuity check, replace the alternator.

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