Dual Battery Wiring Diagram Ford E350

For many vehicle owners, having a dual battery system is a must-have upgrade. A dual battery system is when you have two batteries installed in your vehicle. The primary battery is used to start the engine, while the secondary battery is used to power any additional equipment like lights, winches or a refrigerator.

In this article, we will provide a step-by-step guide on how to install a dual battery system in a Ford E350 van. We will also provide a wiring diagram and answer some frequently asked questions so that you can have a clear understanding of how to install a dual battery system in your Ford E350.

Step-by-Step Guide to Install Dual Battery System in Ford E350

Installing a dual battery system in your Ford E350 may seem daunting but with the right tools and knowledge, it can be done within a few hours. Here is a step-by-step guide:

Step 1: Gather Your Tools and Materials

Before you begin, gather all the necessary tools and materials. You will need:

Tools:

  • Wire cutters and strippers
  • Crimping tool
  • Wrench and socket set
  • Drill and drill bits
  • Electrical tape
  • Heat shrink tubing and heat gun
  • Multimeter

Materials:

  • 2 marine grade batteries
  • Battery isolator kit
  • Battery box
  • 2 battery cables
  • Fuses and fuse holders
  • Wire connectors, terminals, and zip ties

Step 2: Prepare Your Vehicle

Open the hood of your Ford E350 and disconnect the negative terminal of the primary battery. Take some time to plan where you will install the secondary battery and the isolator kit. A good place is under the driver’s seat or in the cargo area. Make sure that the secondary battery is mounted securely in a battery box to prevent any movement while driving.

Step 3: Install Isolator Kit

The battery isolator kit is used to prevent the secondary battery from draining the primary battery. Follow the instructions provided with the kit to install it. Generally, the kit will require you to wire the isolator to the primary battery and then to the secondary battery using the battery cables.

Step 4: Connect Additional Equipment to the Secondary Battery

Once the isolator kit is installed, connect any additional equipment that you want to power to the secondary battery. This could include lights, winches or a refrigerator. Make sure that the equipment is wired correctly and fused to prevent any short circuits.

Step 5: Test Your Dual Battery System

Turn on the engine of your Ford E350 and check that both batteries are charging. Use a multimeter to test the voltage of each battery. The voltage of both batteries should be the same. Test the additional equipment that is connected to the secondary battery to ensure that it is working correctly.

Dual Battery Wiring Diagram Ford E350

The following wiring diagram will help you to wire your dual battery system correctly:

Primary Battery Secondary Battery
Positive (+) Terminal Positive (+) Terminal
Negative (-) Terminal Isolator Kit
Isolator Kit Negative (-) Terminal
Additional Equipment (Fused) Additional Equipment (Fused)

FAQs

1. Why do I need a dual battery system?

A dual battery system is essential for powering additional equipment without draining the primary battery. It is especially useful for camping or off-road enthusiasts who may need to run lights, fridges or winches for extended periods.

2. Can I use any type of battery?

No. It is recommended that you use marine batteries as they are designed for deep cycling, which is suitable for a dual battery system.

3. Can I install a dual battery system myself?

Yes, you can. However, it is recommended that you have some knowledge of electrical wiring or seek the assistance of a professional.

4. Can I charge both batteries while driving?

Yes, a dual battery system allows both batteries to charge while driving. The battery isolator kit prevents the secondary battery from draining the primary battery.

5. How long will the secondary battery last?

The lifespan of the secondary battery depends on various factors such as the usage, maintenance and quality of the battery. However, marine batteries are designed to last longer than regular car batteries.

By following the above steps and using the right tools, you can easily install a dual battery system in your Ford E350. Remember to take your time and ensure that all wiring is done correctly and fused to prevent any electrical faults. With this upgrade, you can enjoy extended hours of camping or off-roading without worrying about draining your primary battery.