How do you determine whether the problems you are facing come from a bad fusible link or a problematic ECU? It is very hard to tell. Because the symptoms you will see are a lot similar in both of them. But when you can replace the fusible link by spending only a couple of bucks, you are going to need a lot more than that to fix any ECU-related problems.

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Fusible link chart

How do you size a fusible link?

4-gauge wire Protected by18-gaugefusible link
6-gauge wire Protected by10-gauge wire fusible link.
10 gauge wire Protected by14 -gauge wire fusible link.
NOTE: The fusible link that protects the wire should be two gauge sizes (or four numbers larger). Thelengthof afusible linkshould not exceed 9″ .19, 15, 13, and 11 are counted whensizingalink


What happens when a fusible link goes bad?

You will start seeing symptoms if that happens. Although the ignition will remain safe, you will face issues with the electrical components. As the fusible link has gone bad and broken the circuit, there won’t be any flow of current and the vehicle won’t start. Don’t get confused with this problem with the starting motor issue.

How do you tell if a fusible link is bad?

As the symptoms are quite similar to starting motor problems and ECU-related issues, it is really hard to tell. If you see the symptoms, you have no way but to go under the hood. Near the battery, you are most likely to find the fusible link. If you see it, you will know the condition of it.

Can you replace a fusible link with a fuse?

Technically, yes. But it is not a good idea. The vehicle engineers had put the fusible links in the vehicles in the first place for a reason. Fusible links are compact in structure and able to handle a lot more current than the common fuses. But if it is urgent or you want to do it anyway, we recommend you using mega fuses to get the job done.

What does the fusible link do?

The job of a fusible link is to provide safety and protection to the components. The fusible link does it by breaking the circuit in case of an overflow of current. You can say the function is more or less like the function of electrical fuses.

How long are the fusible links?

Well, there is no definite length of a fusible link. The length depends on the wire size of the conductor. Generally, the wire size of the fusible link is 4 gauges smaller than that of the original conductor. Plus, you should not use fusible links that are longer than 12 inches.

How do you test a fusible link alternator?

In this case, to test a fusible link near the alternator, you have to use a voltmeter or a multimeter. Use the meter in the wiring of the fusible link. By seeing the result, you will know what happened there.

Alternator problems? Do a Fusible links test


A fusible link is a tiny piece of wire that makes sure your vehicle’s other electrical components stay safe from any possible overflow of current. That is why it is very important to keep the fusible links updated. Well, in case you don’t do that, you won’t be able to start the vehicle.

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The symptoms you will see are very similar to the problems regarding starting motor and ECU-related problems. It is very much possible to get confused. And thus it is too important to confirm that it is a fusible link problem first. Otherwise, you are nothing but wasting money. And hey, do not forget to let us know your thought in the comment box. If you have any queries, you are welcome.