Trolling Motor Wire Size Chart: Specs for Optimal Performance

Trolling motors are an essential component of any fishing boat, providing quiet and efficient propulsion. However, to ensure optimal performance, it is crucial to pay attention to the wire size used for connecting the trolling motor. In this comprehensive guide, we will explore the importance of trolling motor wire size, delve into the factors influencing wire size selection, provide detailed methods for determining the right wire size, highlight the benefits of using the correct wire size, and offer practical tips for wiring installation and maintenance.

Understanding Trolling Motor Wire Size

The wire size used to connect a trolling motor refers to the thickness or gauge of the wire. It plays a crucial role in ensuring efficient power delivery, preventing voltage drop, and avoiding overheating of the wires. Wire size is determined by its ability to carry the electrical current required by the trolling motor without significant resistance.

Factors Influencing Wire Size Selection

When selecting the appropriate wire size for a trolling motor, several factors should be taken into account:

  1. Trolling Motor Thrust Rating: The thrust rating of the trolling motor is a crucial factor in determining the wire size. Higher thrust motors typically require larger wire sizes to handle the increased electrical current.
  • Boat Length: The length of the boat plays a role in determining the wire size needed. Longer boats require longer wire runs, which can lead to greater resistance and voltage drop if the wire size is inadequate.
  • Voltage Drop Tolerance: Different trolling motors have varying voltage drop tolerances. It is important to consider the trolling motor’s voltage drop specifications to ensure that the selected wire size minimizes voltage drop and maintains optimal performance.
  • Wire Length: The length of the wire run from the battery to the trolling motor affects the wire size. Longer wire runs require larger wire gauges to compensate for resistance and ensure proper power delivery.
  • Battery Configuration: The type and configuration of batteries used in the trolling motor setup also influence wire size selection. Different battery types have different discharge rates, and this affects the wire size needed to handle the current flow.

Determining the Right Wire Size

To determine the appropriate wire size for your trolling motor, consider the following guidelines:

  1. Refer to the Manufacturer’s Recommendations: Manufacturers often provide recommendations regarding the suitable wire size for their trolling motors. Check the product manual or contact the manufacturer to obtain specific wire size guidelines.
  • Consult the American Wire Gauge (AWG) Chart: The AWG chart is a widely used reference tool for determining wire sizes. It provides information on the current-carrying capacity of wires based on their gauge. Ensure that the wire size selected can handle the required current without excessive resistance.
  • Calculation of Voltage Drop: Calculate the expected voltage drop over the length of the wire run. This can be done using online calculators or formulas that take into account factors such as wire gauge, wire length, and current draw. If the voltage drop exceeds the tolerable limit for your trolling motor, choose a larger wire size to minimize resistance.
  • Seek Professional Advice: If you are unsure about the appropriate wire size for your trolling motor setup, consult a marine electrician or an expert in boat electrical systems. They can provide personalized recommendations based on your specific requirements.

Trolling Motor Wire Size Chart

5 FT10 FT15 FT20 FT25 FT
30 lb.3050 Amp @ 12 VDC10 AWG10 AWG8 AWG6 AWG4 AWG
40 lb., 45 lb.4250 Amp @ 12 VDC10 AWG8 AWG6 AWG4 AWG4 AWG
50 lb., 55 lb.5060 Amp @ 12 VDC8 AWG6 AWG4 AWG4 AWG2 AWG
70 lb.4250 Amp @ 24 VDC10 AWG10 AWG8 AWG8 AWG6 AWG
80 lb.5660 Amp @ 24 VDC8 AWG8 AWG8 AWG6 AWG6 AWG
101 lb.4650 Amp @ 36 VDC8 AWG8 AWG8 AWG8 AWG8 AWG
Engine Mount 1015060 Amp @ 36 VDC8 AWG8 AWG8 AWG8 AWG8 AWG
112 lb.5260 Amp @ 36 VDC8 AWG8 AWG8 AWG8 AWG8 AWG
Engine Mount 160116(2) x 60 Amp @ 24 VDC6 AWG6 AWG4 AWG2 AWG2 AWG
E-Drive4050 Amp @ 48 VDC10 AWG10 AWG10 AWG10 AWG10 AWG
Talon Shallow Water Anchor3050 Amp @ 12 VDC10 AWG10 AWG8 AWG6 AWG4 AWG
Raptor Shallow Water Anchor7050 Amp @ 12 VDC10 AWG8 AWG6 AWG4 AWG4 AWG

Benefits of Using the Correct Wire Size

Using the correct wire size for your trolling motor setup offers several benefits:

  • Efficient Power Delivery: Proper wire sizing minimizes resistance and voltage drop, ensuring efficient power delivery from the batteries to the trolling motor. This translates into improved performance and longer battery life.
  • Prevention of Overheating: Inadequate wire sizes can lead to excessive resistance, resulting in overheating of the wires. Using the correct wire gauge reduces the risk of wire damage and potential safety hazards.
  • Maximization of Trolling Motor Thrust: By providing the necessary current flow, the right wire size allows the trolling motor to operate at its maximum thrust capacity, enabling better maneuverability on the water.
  • Protection of Battery Life: Using the correct wire size reduces the strain on the batteries by ensuring they receive the necessary power without excessive resistance. This helps prolong the battery life and overall performance.

Tips for Wiring Installation and Maintenance

To ensure a reliable and long-lasting trolling motor setup, consider the following tips:

  • Use Marine-Grade Wire: Select marine-grade wire that is specifically designed for use in marine environments. It is more durable and resistant to corrosion, ensuring optimal performance even in harsh conditions.
  • Proper Wire Routing: Avoid sharp bends and kinks in the wire during installation. These can increase resistance and lead to voltage drop. Use wire clamps or zip ties to secure the wire and prevent it from rubbing against sharp edges.
  • Protective Conduit or Sleeve: Consider using protective conduit or sleeve to shield the wire from potential damage caused by abrasion or exposure to the elements. This additional layer of protection helps maintain the integrity of the wire.
  • Regular Inspection and Maintenance: Periodically inspect the wiring connections, terminals, and insulation for signs of wear or corrosion. Clean the connections and apply dielectric grease to prevent corrosion and maintain optimal conductivity.
  • Following Manufacturer Guidelines: Adhere to the manufacturer’s guidelines for wiring installation, including proper wire sizing, connections, and circuit protection. This ensures compatibility and prevents potential issues.


Selecting the correct wire size for your trolling motor setup is essential for optimal performance, efficiency, and safety. By considering factors such as trolling motor thrust rating, boat length, voltage drop tolerance, wire length, and battery configuration, you can determine the appropriate wire size.

Following the guidelines provided in this comprehensive guide, along with proper wiring installation and maintenance practices, will help you enjoy smooth and reliable operation of your trolling motor for many fishing adventures to come. Remember, when it comes to trolling motor wire size, it’s always better to err on the side of caution and choose a slightly larger wire gauge to ensure optimal performance and longevity.

Leave a Comment