Boat Blower Motor Not Working

Boat Blower Motor Not Working? Here’s Why


The blower motor that ventilates the air of your bilge pump has stopped working. This will stop the air ventilation and your bilge pump will overheat.

What are the reasons for the boat blower motor not working?

This issue can be narrowed down to 4 possible reasons. Faulty wiring, problematic switch, fuse, or a damaged bilge blower. Diagnosing these problems requires some basic knowledge of electronics.

Not convinced yet? Worry not! We present a detailed diagnosis for your better understanding of the issue. You can easily figure out the root of the problem and fix the specific issue.

If you’re willing to spare some time, give this a read-

What Are The Reasons Behind Bad Blower Motor?

If your blower motor isn’t working, there are four possible things at fault for this. We’ll start with inspecting the fuse and end with the blower itself.

A bad blower motor can eventually affect other boat parts such as the outboards. As a result, the outboard might crank but won’t start.

Here are the reasons why your blower motor might not be working-

Problem With The Fuse

The engine compartment blower will stop working all of a sudden. In this case, the light on the switch won’t turn on.

A blown fuse can happen for many reasons. Maybe someone somehow created a short. Or maybe something in the blower housing is slowing down the blower. This generates excess pressure on the circuit. 

Another reason why the blower might stop working is due to the motor insulation breaking down.

Often starting an outboard motor that’s been sitting for long can have problems with the fuse.

If you have the blower under the vent, water and moisture can reach the blower and seize it. So it’s better to relocate your blower just above the vent. This will keep the fuse of the blower in good condition.

A blown fuse can only be fixed by replacing it with a new one. Carefully choose a fuse that has the proper amps for your blower.

Bad Switch

Perform the following procedure to diagnose the switch-

Disconnect the wire at the input terminal after locating it. From the battery, run a new jump-wire to the input terminal. Turn the switch on after connecting the battery to the input terminal.

If the blower turns on, there is a possible break between the switch and the battery. In case it doesn’t come on, you have to go a bit further. 

Disconnect the first jump-wire from the output and run a second jump-wire. Run the second jump-wire to the blower from the output terminal. Turn on the switch after the operation.

Does the blower come on? If it still doesn’t start, we have to assume that you have a bad switch.

In case it does come on, the problem is somewhere between the switch and the blower. Be careful when dealing with the switch. You can inadvertently connect the switch somewhere else other than the blower if not careful enough.

Wiring Problem

Having issues with the wiring of your blower motor can be troublesome. To begin with, your wires will have bad voltage and the blower will not work. Turning on the switch will turn on the light. But the blower will still not work.

This problem can stem from an incorrect electrical grounding system of the boat. Check the power at the connection with a voltmeter. If you don’t have power, check your fuse/circuit breaker and switch. 

If they are fine, there is a problem with your wiring. It won’t 

Make sure that you have a proper grounding of the wire established with the blower. Having a proper grounding reduces the chance of getting weak voltage. If the wire has any internal/ external damage, replace it with new connectors. 

Bad Blower Motor

You have checked the wires, the fuse, and the switch. And you still couldn’t manage to pinpoint any problem in them. 

In such a scenario, we’ve to come to the conclusion that the blower motor is faulty. You can’t do much in this situation and it’s best to buy a new blower motor.

Don’t worry about finding the best replacement. We got you covered! Here are some of the best blower motors that you can get in the market-


A blower plays an important role in fanning out flammable fumes from the engine compartment. It also keeps your outboard free from the risk of explosion. Whether it’s Yamaha or Tohatsu, you should immediately replace your bad blower to avoid safety risks.


Question: How long should a blower operate before starting the engine?

Answer: The recommended length for operating a blower is about 4 minutes prior to starting the engine. This will keep the engine from overheating. The blower should always keep running when the boat is in an idle state.

Question: How much will replacing the blower motor cost?

Answer: On average, you may need to count around $120 to replace your blower motor. The typical range of blower motor replacements can be anywhere between $30 to $300. Even with a warranty, you will still have to pay a hefty labor fee of  $150. High-end models with large motors might sum up as much as $500.

Question: How many blowers do I need in my boat?

Answer: The optimal number of blowers in a boat should be two blowers. One will help to blow inside air out and the other will suck in outside air. Having 2 blowers should be enough to facilitate proper airflow in your boat.

Final Words

You can now figure out the reason for your boat blower motor not working. With this newfound knowledge, you now know which specific part of the blower motor to mend.

Try taking professional help as these issues require technical skills. If the blower fan is beyond any repair, replace it.

Hope this article proved useful to you in dealing with your blower motor. Have a good day!

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