Quick Answer

Quick Answer: What gauge wire is a fusible link?

When placing a fusible link, use a wire guage 4 gauges smaller than the existing wiring circuit. If it is a 14 gauge system, use 18 gauge fusible link wire. JT&amp
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Fusible link wire is designed to “open” a circuit when electrical current overload occurs.

Is a fusible link just a wire?

A Fusible link is a short, low-voltage wire that acts as a fuse in a vehicle’s wiring harness. Fusible links provide circuit protection in the wiring of a vehicle in the case of a short circuit or voltage spike. These insulated wires may be used in applications in which an automotive fuse is unsuitable.

How many amps is a 12 gauge fusible link?

So if we use the marine wiring specs, for your 12 guage wire they say it can handle 45 amps(in house wiring that same wire would be rated for 20amps).

What is the difference between a fuse and a fusible link?

Again, a fusible link’s function is very similar to a fuse. It’s designed to fail before your wiring harness melts to goo. As a general rule, a fusible link is made of wire that is four gauges higher (smaller) than the rest of the circuit, making it the weakest link in your electrical chain.

Is a fusible link just a smaller wire?

An electrical fusible link is a type of electrical fuse that is constructed simply with a short piece of wire typically four American wire gauge sizes smaller than the wire that is being protected.

Can you replace a fusible link with a regular fuse?

It is difficult to replace fusible links with fuses. Fusible links are compact and handle a lot of current before they blow. To replace the fusible links with fuses you will have to use mega fuses, the smallest will most likely be about 50 amps. And this will take up a lot of room, and be more connections to go bad.

How can you tell if a fusible link is blown?

The fusible link is essentially an in line fuse on the positive terminal of the battery. To determine if the fusible link has been blown , one test lead of your ohmmeter should be on the positive terminal of the battery and the other test lead should be on the end of the fusible link going to the circuit it protects.

What happens when fusible link goes out?

When it fails, it will break the continuity in the rest of the circuit, preventing damage to other components down the line. A fusible link typically costs a couple of bucks and can be replaced in 30 minutes.

Where is the electric fusible links are used?

A fusible link is a mechanical or electrical safety device. They are used in fire sprinkler heads to activate the sprinkler in the presence of heat. They are used in automobile electrical systems as a fuse.

Does the length of a fusible link matter?

The length of a fusible link should not exceed 9″. Can a fusible link be used to replace a fuse that blows frequently? In general, a fusible link should never be used to replace an automotive fuse unless authorized by a vehicle factory service bulletin.

How often should fusible links be replaced?

All Fusible Links shall be replaced once a year. The Links shall be replaced sooner during annual inspection if the conditions in (4) exist. The Fusible alloy that is used in the manufacturing of the Fusible Links undergoes a phenomenon known as Creep or Cold flow.

Are fusible links color coded?

Color coding is standard almost across the board for different types of automotive blade fuses, with two notable exceptions: 25 A and 35 A maxi fuses. These are gray and brown, respectively—colors that are also used for lower-amperage fuses.

How do you wire a fusible link?

How to Replace a Fusible Link (Car won’t Start)

How many amps is a yellow fuse?


Color Rating
Red 10
Blue 15
Yellow 20
Clear 25

What is difference between ATO and ATC fuses?

ATO fuses and ATC fuses are regular-sized automotive blade fuses. They are interchangeable, provided the amperage rating is the same. The housing can be open or closed, but neither is sealed or waterproof.

What causes a fusible link to burn?

Typically, a fuse burns out when a circuit attempts to transmit too much current, severing the connection before the electrical charge can have any ill effects.

Are fuses universal?

Not all car fuses are the same, and most cars have multiple fuses of varying sizes for different electrical components. When you are replacing a car fuse, it is essential to replace the blown fuse with a new one of the same type and size. You should also never replace a blown fuse with one of a higher amperage rating.

How do I replace a fusible link?

How to Replace the Fusible Link | 3rd Gen Toyota Pickup

What is a fusible link block?

A fusible link is a special type of wire that protects a circuit that has constant high current requirements and must resist high surges in the circuit. The circuit between the alternator and battery is a good example of a circuit where a fusible link would be used.

Will a car run with a blown fusible link?

Dead Battery

If the alternator’s fuse or fusible link is blown, the alternator will not be able to charge the battery. The battery then doesn’t store enough power for starting the car or keeping it running.

Why am I not getting power to my alternator?

The most common reason an alternator is not charging the battery is due to worn carbon brushes or a damaged alternator itself. It can also be caused by a blown fuse or bad wirings. If your serpentine belt snapped off, the alternator will, of course not charge then either.

How do you test a fusible link with a multimeter?

Disconnect the negative battery cable to measure ohms (continuity). If the battery is connected, use the voltage setting to read voltage,
ground the black (ground) cable on the block to read voltage at either end of the fusible link.

How much resistance should a fusible link have?

A fusible link should not have any “real” resistance that can be accurately measured with a typical over the counter Volt Ohm Meter (VOM). If you have power on both ends of a fusible link and the power does not go away when you wiggle the link, it is good.