How to Increase the Electrical Output of a Ford Transit’s Alternator for Extra Accessories?

You’ve been wanting to add extra accessories to your Ford Transit. Maybe you’re thinking about a high-powered stereo system, additional lighting, or other equipment that needs more power than your stock alternator can provide. How do you increase the electrical output of your Ford Transit’s alternator? This article delves into the methods of increasing the capacity of your alternator to cater for additional power needs.

Understanding Your Alternator and Battery System

Before you delve into the process of increasing the electrical output, it’s crucial to understand how the alternator and battery system operates. The alternator’s primary function is to replenish the charge lost by the battery during the starting process and to power the electrical systems while the vehicle is running.

Avez-vous vu cela : How to Install an LED Light Bar on a Land Rover Discovery for Enhanced Nighttime Off-Roading?

In a Ford Transit, the alternator usually operates at 14 volts and around 100 amps for the regular models. However, some models are equipped with high output alternators which can produce up to 200 amps.

The battery, on the other hand, stores the charge and provides power when the engine is off. It also supports the alternator when the electrical load exceeds the alternator’s output, particularly during high demand periods.

A lire également : What’s the Best Approach to Customizing the Exhaust Note of a Jaguar F-Type V8 for a Sportier Sound?

Increasing Alternator Output Through Upgrades

One way to increase the electrical output of your Ford Transit’s alternator is by upgrading to a high output alternator. This type of alternator is designed to produce more amperage, enabling you to operate more electrical accessories without depleting the battery.

High output alternators can provide as much as 200 to 300 amps, compared to the 100 to 200 amps produced by a standard alternator. This means they have a more substantial charging capacity, which is beneficial when running high-demand electrical systems.

However, fitting a high output alternator may require additional modifications. You may need to upgrade the wiring to accommodate the increased current, and the alternator pulley size may need adjustment to maintain the correct charging speed. In addition, a high output alternator can generate more heat, which may require improved ventilation or a cooling system upgrade.

Altering The Voltage Regulator

Another means of increasing your Ford Transit’s alternator output involves altering the voltage regulator. The voltage regulator controls the alternator’s output voltage to prevent overcharging. By modifying the voltage regulator, you can increase the alternator’s output voltage, therefore enhancing its charging capacity.

Remember, voltage and current (amps) are directly related. By increasing the voltage, you also increase the current, thereby increasing the power (since power is the product of voltage and current).

However, be cautious when making these changes, as an excessive increase in voltage can damage the battery and the vehicle’s electrical systems. Consulting a professional is advisable to avoid any potential damage.

Adding Extra Batteries

Adding extra batteries to your Ford Transit is another way to support the charging system and run additional accessories. These batteries are installed in series, which means the voltage remains the same, but the current capacity (amps) increases.

When you add batteries, the alternator experiences less strain as the batteries share the load, thereby prolonging the alternator’s life. However, keep in mind that the additional batteries will also require space and secure mounting.

Furthermore, the type of battery matters. Deep-cycle batteries are best for running accessories as they can handle repeated discharging and recharging cycles better than standard car batteries.

Adjusting The Alternator’s Wiring

The last method to increase the electrical output of your Ford Transit’s alternator is by adjusting the wiring. This is because the thickness of the wire affects the amount of current it can carry. By using thicker wire, also known as gauge wire, you can increase the current flow.

Rewiring the alternator with heavier gauge wire can help reduce resistance and improve efficiency, allowing for a higher current flow. This can be beneficial for high output alternators or when running equipment with high power needs.

Also, when upgrading the wiring, consider upgrading the ground wire. A good ground connection is crucial for a well-functioning charging system.

Remember, however, this should be done by a professional or someone well-versed in automotive wiring to avoid issues like electrical shorts or fire risks.

Choosing a Dual Alternator System

Apart from the previously mentioned methods, another powerful way to increase the electrical output for your Ford Transit is by installing a dual alternator system. In essence, a dual alternator system is designed with two alternators. One takes care of the vehicle’s standard electrical load, while the other is devoted to your extra accessories.

In such a system, one alternator, typically the factory-installed one, maintains the necessary charging for the vehicle’s basic electrical needs. On the other hand, the secondary alternator – a high output, heavy-duty alternator – provides the extra power needed for additional electrical systems. This setup ensures your extra accessories get the power they need without compromising the vehicle’s essential functions.

A dual alternator system also comes with a smart Battery Management System (BMS). A smart BMS regulates the power flow from the alternators to the batteries, ensuring optimal charging and safeguarding against overcharging. This way, the system maintains the health of your battery bank, extending its lifespan and performance.

While installing a dual alternator system may demand more space and could be more expensive due to the cost of an extra alternator, the benefits could outweigh the initial costs in the long run. This setup offers a reliable and efficient way to meet high-power demand and prolongs the life of your charging system. It is also an excellent option for camper vans or other Ford Transits with high power systems needs.

Considering a Lithium Battery System

When thinking about increasing the electrical output of your Ford Transit, incorporating a lithium battery bank into your power systems can be beneficial. Lithium batteries are known for their high amp hours rating, which means they can store more energy than regular batteries. This feature makes them ideal for use in vehicles with high demand for power, such as those with a high amp alternator.

Lithium batteries also have a higher energy density, meaning they can store more energy in the same amount of space as traditional batteries. This is a significant advantage, especially in a Ford Transit, where space can be a limiting factor.

Additionally, lithium batteries work well with high output alternators and smart BMS, increasing overall system efficiency. They can handle the high amp output from the alternator and provide the needed power for your extra accessories.

While they may be more expensive than traditional batteries, lithium batteries often have longer lifespans and better performance. They enhance the electrical system’s overall efficiency and reliability, making them a worthy investment.


Increasing the electrical output of a Ford Transit’s alternator to power extra accessories doesn’t have to be a daunting task. With options like upgrading to a high output or dual alternator system, adjusting the wiring, altering the voltage regulator, or adding extra batteries, you can safely enhance your alternator’s capacity.

Keep in mind that every modification should be compatible with your current system and safely installed to prevent any damage. If you are unsure, consider consulting a professional or a company specialized in power systems for vehicles like Victron Energy.

By understanding these methods, you can make informed decisions and enjoy the added convenience and comfort that your extra accessories bring to your Ford Transit. With the right approach, you can efficiently power your additional equipment and elevate your Ford Transit experience.

Copyright 2024. All Rights Reserved