The steps below will walk you through diagnosing if you have an issue with your power, what that issue is and where it is located. If you find an issue with your power, you will need to resolve it for proper operation of your trolling motor.
Jump to:
- Steps to Troubleshoot Power Issues
- Marine Battery Wiring - Wire Size, Circuit Breakers, Series/Parallel, and Best Practices
- Resources
Caution: If you are unfamiliar with wiring and troubleshooting power issues it is recommended to consult a Certified Marine Technician. Troubleshooting Power Issues presents the risk of electrical shock or burns.
Steps to Troubleshoot Power Issues
- Your batteries need to be capable of providing proper power to your motor. If the batteries are insufficient, you can have issues with using the motor including the motor only working for a short time, the motor working erratically, or the motor not working at all. Click this link for additional information on verifying you have appropriate batteries.
Verifying Correct Battery and Battery Health
- Ensure batteries are fully charged
- Inspect Battery Connection to make sure they are clean connections
-
Load Test each battery:
- Caution: If you are unsure of how to use a Load Tester safely do not attempt and consult a technician. Handled improperly there is a risk of electrical shock or burns.
- Batteries should test at 12.6V minimum under a load.
- Load testing can be done with hand held load tester or Auto Parts stores that sell batteries will often test batteries for no charge.
- Note: Load Testers do vary in the load they apply so the rating on the load tester, usually “Good”, “Weak”, “Bad”, should be trusted. For motors with GPS Navigation, only “Good” batteries should continue to be used. Loose or corroded connections and inadequate wiring also affect the voltage getting to the motor.
- As batteries age the chemistry inside changes and they are less able to provide as much current at once and the internal connections degrade with use, this is why they will eventually fail a load test with age. If a battery has an internal short which could be caused by dropping the battery and causing the plates within to shift so they are no longer separated it will fail a load test because of this damage.
-
Checking Batteries with Volt Meter:
- Caution: If you are unsure of how to use a VOM to safely Measure Voltage while the Motor is in use do not attempt and consult a marine installer. Handled improperly there is a risk of electrical shock or burns.
- It may be possible to use a Volt Meter and your motor to Load Test your entire power supply; on the water, use the VOM to probe the power supply as close to the motor as you can, read the voltage when the motor is not running and when the motor is running on high. The difference between the resting voltage and the voltage when the motor running on high in the water should be less than 5%. 5% of 12 volts is 0.6, 24 volts is 1.2, and 36 volts is 1.8.
- Lithium Batteries and Continuous Discharge Amperage
- When using lithium batteries, you want to ensure the battery(s) provide(s) enough continuous discharge amperage to run the motor at its max amp draw. The chart below shows the max amp draw by motor thrust. If the motor is not getting enough amperage, it will have issues including working for a short time and then shutting off, being able to turn on the motor but not turn on the prop, steering issues, issues with Advanced GPS Navigation such as Spot Lock not working or being erratic. If you are having any issues with your motor and you are using Lithium batteries, verify you have enough continuous amperage available for the motor to pull its max amp draw.
Inspect Wiring
- Confirm correct wiring size for you setup.
- Click here to view Conductor Gauge Charge
- Visually inspect wiring for kinks or wear. Check for:Hotspots can be identified during use. Note: If warms spots section may need to be replaced.
- If you are having issues with your motor and the batteries are charged, have been load tested (FLA, AGM or Gel) and are testing good, you will want to check the connections between the trolling motor and battery(s). The connections should be clean and tight. If there is any corrosion, buildup, or anything contaminating the terminals or connectors, they should be cleaned and then reconnect the terminals or connectors.
-
Quick Disconnects and Plug and Receptacles Connections
- If you are using a Quick Disconnect or Plug and Receptacle, check the connections coming from the motor into the quick disconnect or the plug to verify the connections are secure and the polarity is correct. Also verify the connections are clean with no buildup and no damage to connectors. Damage, corrosion, buildup, and loose connections can cause issues with power transfer. Next check the connections coming from the battery(s) to the quick disconnect or receptacle. Again you want a clean and tight connection with no buildup and no damage to prevent power transfer.
-
Circuit Breaker
-
Minn Kota MKR-27 Circuit Breaker
- The circuit breaker should be appropriate size for the trolling motor. The chart below will show what circuit breaker is needed by motor. Verify the circuit has not been tripped and is in good condition. Also verify the circuit breaker connections are clean and tight and there is no buildup on the terminals.
- NOTE: QUEST Motors are designed to not pull more than 60 amps on high speed. For Safety Circuit Breakers larger than 60 amps should not be used for QUEST Motor installation.
-
Minn Kota MKR-27 Circuit Breaker
Boat Wiring Test Voltage as Key Points
- The wiring between the motor and batteries should be of an appropriate gauge and in good condition. Note: Using an incorrect wire gauge, circuit breaker size, plug size, or having poor connections can lead to equipment damage, fire hazards, and diminished performance. Please refer to the chart below for selecting the correct circuit breaker, plug and receptacle, and wire gauge sizes for your setup.
Trolling Motor Power Leads
- Trolling motors come installed with 6 ft. 10 AWG red and black power leads. We recommend adhering to the chart below when selecting the correct gauge of wire to extend the trolling motor battery leads. Note: The Endura 30 lb. thrust motor has been optimized to perform as a portable trolling motor. We do not recommend altering the battery lead wires on this motor.
Note: Kayak Terrova
-
If using a plug and receptacle or Quick Disconnect
- Measure voltage at:
- Battery Terminals
- Receptacle or Quick Disconnect
- Trolling motor leads running to control board.
- Voltage Measurements should be consistent at all points.
Check Continuity
- If all connections are clean and tight but issues persist:
- Use a continuity tester to check wiring integrity
Minn Kota Authorized Service Provider
- After conducting all troubleshooting above to rule out power issues the next step would be to contact an Authorized Minn Kota Service Provider.
