how to bypass computer controlled alternator

How To Bypass Computer Controlled Alternator

Computer controlled alternator repairs are very expensive. So bypassing is a good solution for everyone who likes to save some money. So how to bypass computer controlled alternator?

You have to install an external voltage regulator to bypass the computer controlled alternator.

I did thorough research to find out how to bypass computer controlled alternator. Finally, I was able to find a successful way, and I bypassed my alternator. In this article, I will explain how I bypassed my alternator. Let’s dive into the topic: how to bypass computer controlled alternator.

What are Computer-Controlled Alternators?

Engine control module/central computer of a car

First, it is important to understand the alternator in our vehicles. Computer-controlled alternators are controlled by the vehicle’s engine control unit (ECU). The ECU sends a signal to the alternator when the vehicle demands more load. The alternator has to regulate its charge rate to change electrical loads.

What Are the Advantages and Disadvantages of Computer-Controlled Alternators?

Here are the advantages and disadvantages of alternators, which are controlled by the ECU of the vehicle.

Advantages of Computer ControlDisadvantages of Computer Control
Precision and AccuracyComplexity
EfficiencyReliability and Dependence
Automation and IntegrationCost
Diagnostic CapabilitiesLimited Redundancy
Flexibility and Adaptability

What Are the Common Problems with Computer Controlled Alternators?

There are some special problems associated with computer-controlled alternators. These problems cannot be seen or are rare in normal alternators.

Sensor problems

Computer-controlled alternators rely on different sensors to monitor system parameters and adjust output accordingly. What happens if a sensor fails or provides incorrect readings? You know it interrupts the alternator’s operation. It leads to irregular charging.

Engine Control Module Issues

The engine control module controls the operation of the alternator. So, engine control module faults affect the performance of the alternator. A faulty ECU leads to incorrect voltage regulation.

Malfunctioning Voltage Regulator

The output voltage of the alternator is controlled by the voltage regulator. If it fails or malfunctions, it results in overcharging or undercharging of the battery and problems with electrical components.

How To Bypass Computer Controlled Alternator?

Let’s move on to our topic: how to bypass computer controlled alternator. This is how I bypassed the computer-controlled alternator in my car. I will explain to you how to bypass computer controlled alternator as a step-by-step guide.

Tools needed:

  • External voltage regulator
  • The plug that connects to the voltage regulator
  • 14-gauge wire (red and black)
  • Soldering iron and solder
  • Electrical tape
  • Wire connectors or wire nuts
  • Sandpaper or a wire brush
  • Sheet metal screws
  • Green wire (for grounding)
  • Heat shrink tubing (optional)
  • Inline fuses (optional)

Step 1: Prepare the Wires

First, I cut three five-foot-long wires and stripped both ends of all of them.

Step 2: Identify the Connections 

Then I identified the connections between the regulator and the alternator. The voltage regulator had a center wire, a red wire (positive), and two black wires (alternator connections).

There were two connectors on the alternator. One for the battery and the other for the voltage regulator.

Step 3: Connect the Wires

I connected the center wire from the voltage regulator to the alternator’s top center connector. Then I connected the two black wires from the regulator to the alternator connectors. Next, I connected the red wire to the positive battery terminal.

Step 4: Secure the Connections

Soldering iron on a table

I soldered all the connections, and I used heat shrink tubing to insulate the soldered connections to protect them. I wrapped the tape around the connection for additional protection.

Step 5: Ground the Voltage Regulator

I sanded down an area near the grounding point of the voltage regulator. Then I attached green wire to the regulator and the alternator. I used sheet metal screws to secure the green wire.

Step 6: Install Inline Fuses (Optional)

I inserted some inline fuses into the wiring. These fuses protect the electrical system in the event of a fault.

Step 7: Test the Setup

I double-checked the connections. Finally, I started the vehicle and monitored the voltage output. It was 13.5. It meant my mission was successful.

This video will help you understand the process more clearly.


Can you drive without an alternator?

You can drive without the alternator for a few miles. That’s only until the battery dies. The alternator supplies power to the mandatory components of the engine’s function, such as the fuel pump and water pump. The battery will die soon as there is no alternator to charge it.

How many amps does a car alternator produce?

The ratings of many late-model vehicles’ alternators range from roughly 60 amps to 150 amps or more. Some high-power alternators have a maximum amp output of 200. The alternator’s amp rating is compatible with the car’s electrical system. Typically, 12 V alternators are used in vehicles.

How much copper is in an alternator?

Copper is commonly used in the alternator’s stator windings, rotor windings, brushes, and electrical connections. The amount of copper in an alternator can vary depending on its size, design, and specific manufacturer. An alternator typically contains 2.8 pounds of copper.

Why is my alternator whining?

A worn-out bearing could be the source of the whining noise. When the voltage regulator instructs the alternator to charge more than is required, the car may also whine. Any whining or grinding noises are an indication that your alternator needs to be checked. You can do a bench test to diagnose voltage of the alternator.


Now you know how to bypass computer controlled alternator. It is an easy process that can be done yourself with the proper tools. Thanks for reading. Have a nice day!

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