Kristian Ferrell
There are many reasons why a boat speedometer might stop working. The speedometer is usually controlled by a pitot tube, which is often coloured black and is thicker than most wiring in the boat. If the speedometer is not working, you should check the tube for any holes or damage. If there are no issues with the tube, you should then check the speedometer itself. If the speedometer needle does not move, you should remove the tube from the speedometer. Other causes of a speedometer malfunction could be due to fuses, corrosion, or a clogged pitot tube.
| Characteristics | Values |
|---|---|
| Fuses | Could be blown |
| Corrosion | Could be present |
| Rectifier | Could be damaged |
| Pitot tube | Could be damaged or have holes |
| Plastic line | Could be broken, cracked or clogged |
| Water pressure | Could be blocked by mud, wood or other debris |
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What You'll Learn
A broken plastic unit
To check if this is the case, disconnect the tube on the pitot tube or outdoor motor and blow air into the tube for about 10 seconds. If the speedometer needle does not move, remove the tube from the speedometer. If there are no holes or cuts on the tube, the cause of the malfunction may be due to a damaged pitot tube. In this case, the tube should be replaced.
Another potential cause of a speedometer malfunction is mud, wood, or other debris clogging the pitot tube. This can be fixed by taking the smallest drill bit you can find and, turning it by hand, trying to drill out the material. Once you feel the resistance quit, stop using the drill bit.
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Corrosion
The speedometer's tube, which is generally located under the dashboard of the boat, is often the culprit. This tube is thicker than most wiring in the boat and is usually black. If there are any holes or damage to the tube, it can cause the speedometer to malfunction.
In addition to the tube, the pitot tube can also be a source of corrosion. The pitot tube is responsible for measuring water pressure, which is then converted into an estimated speed. If the pitot tube becomes clogged with mud, wood, or other debris, it can cause the speedometer to stop working.
To fix a clogged pitot tube, you can try using a small drill bit to carefully remove the obstruction. It is important to stop drilling once you feel resistance, as you do not want to damage the tube.
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A damaged pitot tube
If the pitot tube is damaged, it will need to be replaced. To check if the pitot tube is damaged, locate the tube and inspect it for any holes, cuts, cracks, or clogs. If there are no visible signs of damage, disconnect the tube from the pitot tube or outdoor motor and blow air into it for about 10 seconds. Ask someone to observe the speedometer while you do this. If the speedometer needle does not move, remove the tube from the speedometer and replace it with a new one.
A clogged pitot tube can also cause the speedometer to malfunction. This can be due to mud, wood, or other debris blocking the tube. To clear a clog, use the smallest drill bit you can find and turn it by hand to drill out the material. Stop drilling once you feel the resistance quit.
In some cases, the plastic unit of the speedometer may be broken, which can also lead to a malfunctioning speedometer.
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Clogging
A boat speedometer can stop working for a number of reasons, including issues with the pitot tube, which is the tube of the speedometer. This tube is usually black and thicker than most wiring in the boat. If the speedometer is not working, it is important to check the tube for any holes, damage, or clogs. If there are no issues with the tube, then the speedometer itself may be the problem.
To check for clogs in the pitot tube, disconnect the tube from the outdoor motor or pitot tube and blow air into the tube for about 10 seconds. If the speedometer needle does not move, then the tube is likely clogged. In this case, you can try to clear the clog by using a small drill bit to carefully drill out the material. Make sure to stop drilling once you feel resistance. Alternatively, you can replace the tube with a new one.
It is also important to check the plastic line connected to the speedometer for any breaks, cracks, or clogs, as these can also cause the speedometer to malfunction.
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Fuses
A boat speedometer is normally mechanical and controlled by a pitot tube. If your speedometer is not working, you should check the tube for any holes or damage. If the tube is damaged, you will need to replace it. If the tube is intact, you should disconnect it and blow air into it for about 10 seconds. If the speedometer needle does not move, you should remove the tube from the speedometer.
If the tube is not damaged, the problem may be due to a clogged tube. You can try to clear the clog by taking the smallest drill bit you can find and, turning it by hand, drilling out the material. Once you feel the resistance quit, stop using the drill bit.
If your speedometer is still not working, the problem may be due to a blown fuse. Fuses are an important safety feature in any electrical system, including boat speedometers. They are designed to protect the circuit from damage in the event of a power surge. When too much current flows through a circuit, the fuse will blow, interrupting the flow of electricity and preventing damage to the circuit.
If a fuse blows, it must be replaced. Fuses are typically located near the battery or in a fuse box. To replace a fuse, first locate the fuse box and identify which fuse has blown. You can do this by looking for a blown fuse, which will have a broken wire inside, or by using a fuse tester. Once you have identified the blown fuse, remove it from the fuse box and replace it with a new fuse of the same type and rating. It is important to use a fuse with the correct rating, as using a fuse with a higher rating can cause damage to the circuit.
It is also important to address the cause of the blown fuse. A blown fuse may be caused by a short circuit, a faulty appliance, or an overloaded circuit. It is important to identify and address the cause to prevent the fuse from blowing again.
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Frequently asked questions
There are many reasons why a boat speedometer might stop working. It could be due to a damaged pitot tube, or there could be holes in the tube that are causing the speedometer to malfunction.
Disconnect the tube on the pitot tube or outdoor motor and blow air into the tube for about 10 seconds. If the speedometer needle does not move, the pitot tube is likely damaged.
If you find any holes on the tube, you will need to replace it with a new one.
It could be due to fuses, corrosion, or a clogged pitot tube. Try to clear any debris from the pitot tube and check for any signs of corrosion.
