12v Hydraulic Pump Wiring Diagram: A Comprehensive Guide

Hydraulic pumps are an essential component of hydraulic systems that help power heavy machinery and equipment. A 12v hydraulic pump can be used in various applications, such as in dump trailers, boat lifts, and snowplows. However, wiring a hydraulic pump can be challenging if you don’t have the right knowledge and skills. In this article, we will provide you with a comprehensive guide on how to wire a 12v hydraulic pump correctly.

What is a 12v Hydraulic Pump?

A 12v hydraulic pump is a type of hydraulic pump that operates on a 12-volt DC power source. It is commonly used in mobile applications, such as in cars, trucks, and boats, where a hydraulic system is needed to operate various components. The 12v hydraulic pump can produce high-pressure fluid that can be used to lift heavy loads or power hydraulic motors.

How Does a 12v Hydraulic Pump Work?

A 12v hydraulic pump works by converting electrical energy into mechanical energy. When the pump is connected to a 12-volt DC power source, the motor inside the pump starts spinning, which drives the hydraulic fluid from the reservoir into the pump’s cylinder. The fluid is then compressed, which creates pressure in the system. This pressure can then be used to operate various hydraulic components, such as cylinders, motors, and valves.

Benefits of Using a 12v Hydraulic Pump

There are several benefits of using a 12v hydraulic pump, including:

  • Efficiency: 12v hydraulic pumps are highly efficient and can deliver a lot of power with minimal energy input.
  • Reliability: Hydraulic systems are known for their durability and reliability, making them ideal for use in harsh environments.
  • Cost-effective: 12v hydraulic pumps are cost-effective compared to other types of hydraulic pumps, making them ideal for small-scale applications.
  • Easy to operate: 12v hydraulic pumps are easy to install and operate, making them ideal for DIY enthusiasts and professionals alike.

How to Wire a 12v Hydraulic Pump

Wiring a 12v hydraulic pump can be a bit tricky, but with the right tools and knowledge, it can be easily done. Here are the steps to follow:

Step 1: Gather the Required Tools

Before you start wiring your 12v hydraulic pump, you need to have the following tools:

  • A wire stripper
  • A crimping tool
  • A soldering iron (optional)
  • A multimeter
  • A 12-volt DC power source
  • A 12v hydraulic pump

Step 2: Prepare the Wires

The next step is to prepare the wires that you will use to connect the hydraulic pump to the power source. Strip the insulation from the end of each wire using the wire stripper. You should have at least two wires: one for positive (+) and one for negative (-).

Step 3: Connect the Wires

Connect the wires to the pump’s motor terminals. The positive wire should be connected to the positive (+) motor terminal, and the negative wire should be connected to the negative (-) motor terminal. Use the crimping tool to attach the wires securely to the terminals.

Step 4: Connect the Power Source

The next step is to connect the 12-volt DC power source to the hydraulic pump. Connect the positive (+) wire from the power source to the positive (+) wire on the pump. Connect the negative (-) wire from the power source to the negative (-) wire on the pump. Use the crimping tool to connect the wires securely.

Step 5: Test the Pump

After you have connected all the wires, it’s time to test the hydraulic pump. Use a multimeter to check the voltage across the motor terminals. You should get a reading of 12 volts or slightly less. If you get a higher or lower reading, there may be a problem with the wiring.

Step 6: Mount the Pump

Once you have tested the pump and ensured that it is working correctly, mount it in its intended location. Make sure that it is secured properly and that all the wires are properly insulated to prevent any accidents.


What size wire should I use to wire a 12v hydraulic pump?

The size of wire you should use depends on the amount of current your hydraulic pump requires. Generally, a wire size of 10-12 AWG is suitable for most 12v hydraulic pumps.

What is the maximum current draw of a 12v hydraulic pump?

The maximum current draw of a 12v hydraulic pump varies depending on its size and capacity. Generally, most 12v hydraulic pumps draw between 10-20 amps.

Can I wire a 12v hydraulic pump in parallel with other loads?

Yes, you can wire a 12v hydraulic pump in parallel with other loads, as long as the total current draw does not exceed the capacity of the power source or the circuit breaker.

Can I use a fuse instead of a circuit breaker for 12v hydraulic pump protection?

No, it is not recommended to use a fuse instead of a circuit breaker for 12v hydraulic pump protection. Fuses can be unreliable and may not work correctly when the current exceeds the rated value. Circuit breakers, on the other hand, are designed to trip when the current exceeds the rated value, providing better protection.


Wiring a 12v hydraulic pump is an essential skill that every DIY enthusiast and professional should have. By following the steps outlined in this article, you should be able to wire your 12v hydraulic pump correctly and safely. Remember to use the right tools and follow safety precautions to prevent accidents and injuries.