Ayrton Oneill
If you're worried that your boat's alternator might not be working, there are a few signs to look out for and tests you can do. It's important to pay attention to these signs as you can typically spot an alternator that is failing or has failed before your boat completely refuses to work.
| Characteristics | Values |
|---|---|
| What to do if you're not mechanical or good with electrical issues | Find a good location to put test leads on your electrical system |
| How to test the alternator | Use a digital voltmeter to check the battery terminals after the engine has reached operating temperature |
| What the voltmeter should read | The battery should be fully charged and the meter should read approx. 14.0 VDC with the engine at 2000 RPMs |
| What to do if the voltmeter reads more than 14.4 VDC | The alternator regulator is not working |
| What to wear when testing the alternator | Do not wear a long-sleeved shirt or anything that will get caught in the pulleys |
| How the alternator starts working | When you turn the ignition key on the panel in the cockpit |
| What happens next | The ignition light switches on, allowing voltage to the alternator excitation circuit |
| What happens after that | The alternator starts producing AC voltage which is rectified to produce DC voltage |
| What the rev counter does | It drives off the AC cycles and calculates the number of revolutions from that |
| What to do if the rev counter starts dropping or doesn't work at all | Check the relays and fuses attached to the engine |
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What You'll Learn
Check the battery terminals with a digital voltmeter
Checking the battery terminals with a digital voltmeter is one way to test if a boat alternator is working. This should be done after the engine has reached operating temperature. The battery should be fully charged and the meter should read approximately 14.0 VDC with the engine at 2000 RPMs. Write down the reading for reference, as it will be used in the next step. If it is more than 14.4 VDC, the alternator regulator is not working.
Before testing the battery terminals, you should check for any obvious signs that the alternator is failing. For example, if the rev counter starts dropping or doesn't work at all, it means it's not getting a feed from the alternator. In this case, you should check the relays and fuses attached to the engine.
The alternator starts working when you turn the ignition key on the panel in the cockpit. This switches on the ignition light, which allows voltage to the alternator excitation circuit. The alternator then starts producing AC voltage, which is rectified to produce DC voltage. The rev counter then drives off the AC cycles and calculates the number of revolutions from that.
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Check the ignition light
To check the ignition light, turn the ignition key on the panel in the cockpit. This will switch on the ignition light, allowing voltage to the alternator excitation circuit. The alternator then starts producing AC voltage, which is rectified to produce DC voltage. The rev counter then drives off the AC cycles and calculates the number of revolutions from that. If the rev counter starts dropping, or doesn't work at all, it means it's not getting a feed from the alternator. Check the relays and fuses attached to the engine.
You can also use a digital voltmeter to check the battery terminals after the engine has reached operating temperature. The battery should be fully charged and the meter should read approximately 14.0 VDC with the engine at 2000 RPMs. Write down the reading for reference. If it is more than 14.4 VDC, the alternator regulator is not working.
There are a few signs that the alternator may be failing. It's important to pay attention to these signs, as you can typically spot an alternator that is failing or has failed before your boat completely refuses to work.
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Check the relays and fuses attached to the engine
If the rev counter starts dropping, or doesn't work at all, it means it's not getting a feed from the alternator. The first thing to check would be the relays and fuses attached to the engine.
The alternator starts working when you turn the ignition key on the panel in the cockpit. This switches on the ignition light, which allows voltage to the alternator excitation circuit. The alternator then starts producing AC voltage, which is rectified to produce DC voltage.
Before you start, make sure you are not wearing a long-sleeved shirt or anything that could get caught in the pulleys. The back of the alternator has several wires connected to it, unless it is a single-wire system.
Use a digital voltmeter to check the battery terminals after the engine has reached operating temperature. The battery should be fully charged and the meter should read approximately 14.0 VDC with the engine at 2000 RPMs. Write down the reading for reference; it will be used in the next step. If it is more than 14.4 VDC, the alternator regulator is not working.
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Test the alternator while it is installed
You can test the alternator while it is installed on your boat or vehicle as long as it is in running condition. Firstly, you need to check that the battery is fully charged. Then, use a digital voltmeter to check the battery terminals after the engine has reached operating temperature. The meter should read approximately 14.0 VDC with the engine at 2000 RPMs. Write down the reading for reference, as it will be used in the next step. If it is more than 14.4 VDC, the alternator regulator is not working.
The next test is easier with gator clip voltmeter leads. Make sure you are not wearing a long-sleeved shirt or anything that could get caught in the pulleys. The back of the alternator has several wires connected to it, unless it is a single-wire system.
The alternator starts working when you turn the ignition key on the panel in the cockpit. This switches on the ignition light, which allows voltage to the alternator excitation circuit. The alternator then starts producing AC voltage, which is rectified to produce DC voltage. The rev counter then drives off the AC cycles and calculates the number of revolutions from that. If the rev counter starts dropping, or doesn't work at all, it means it's not getting a feed from the alternator.
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Check the rev counter
Checking the rev counter is a good way to see if your boat's alternator is working. The alternator starts working when you turn the ignition key on the panel in the cockpit. This switches on the ignition light, which allows voltage to the alternator excitation circuit. The rev counter then drives off the AC cycles and calculates the number of revolutions from that. If the rev counter starts dropping, or doesn't work at all, it means it's not getting a feed from the alternator.
If you see this happening, the first thing to check would be the relays and fuses attached to the engine. You can also use a digital voltmeter to check the battery terminals after the engine has reached operating temperature. The battery should be fully charged and the meter should read approximately 14.0 VDC with the engine at 2000 RPMs. Write down the reading for reference; it will be used in the next step. If it is more than 14.4 VDC, the alternator regulator is not working.
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Frequently asked questions
If the rev counter starts dropping, or doesn't work at all, it means it's not getting a feed from the alternator. You can also use a digital voltmeter to check the battery terminals after the engine has reached operating temperature. The battery should be fully charged and the meter should read approximately 14.0 VDC with the engine at 2000 RPMs.
You can test an alternator while it is installed on your boat as long as it is in running condition. Find a good location to put test leads on your electrical system.
There are a few signs that the alternator on your boat may be failing. It's important to pay attention to these signs as you can typically spot an alternator that is failing or has failed before your vehicle completely refuses to work.
