Step by step new kid on the block audio amplifier
Jeremy Laukkonen is automotive and tech writer for numerous major trade publications as well as the creator of a popular blog and video game startup. A fan of EVs since the early s, he stays up-to-date on the myriad complex systems that power battery electric vehicles. When a car audio amplifier fuse blows, getting to the bottom of the problem starts with figuring out exactly which fuse bit the dust. There are two or three different types of car amp fuses in a typical installation, so finding the root cause in any given situation hinges on figuring out which one blew and then narrowing down the possibilities of why it did so. In cases where a power cable connects the amplifier directly to the battery, and it's wired properly , then there will be an inline fuse that can blow in addition to the internal amp fuse. In other installations, power is drawn from a distribution block with a fuse of its own.
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Wi-Fi 6E: the new kid on the block
Jeremy Laukkonen is automotive and tech writer for numerous major trade publications as well as the creator of a popular blog and video game startup. A fan of EVs since the early s, he stays up-to-date on the myriad complex systems that power battery electric vehicles. When a car audio amplifier fuse blows, getting to the bottom of the problem starts with figuring out exactly which fuse bit the dust.
There are two or three different types of car amp fuses in a typical installation, so finding the root cause in any given situation hinges on figuring out which one blew and then narrowing down the possibilities of why it did so.
In cases where a power cable connects the amplifier directly to the battery, and it's wired properly , then there will be an inline fuse that can blow in addition to the internal amp fuse. In other installations, power is drawn from a distribution block with a fuse of its own.
So, depending on how an amplifier is wired into the electrical system, you can find yourself dealing with a variety of different fuses. In any case, the main reasons for an amp fuse to blow include a short to ground somewhere along the power supply line and internal amplifier faults.
Replace the blown fuse with everything turned off. If the fuse blows with everything turned off, there is probably a short between that fuse and the rest of the system. Replace the fuse again with the amplifier disconnected.
If the fuse still blows, there is a short somewhere in the wiring. If the fuse doesn't blow with everything turned off, but it does blow when the amplifier turns on, there is probably an internal problem with the amplifier. The first step in figuring out why a car amp fuse keeps blowing is to determine which fuse is actually blown.
Fuses blow when more amperage flows through them than they can handle, and a hot fuse can handle less amperage than a cold fuse. Since the original fuse was almost certainly hot when it blew, putting a new fuse with the same rating in may allow a malfunctioning amp to draw even more amperage than it did prior to blowing the old fuse, which could result in further internal damage.
In any case, you want to identify how many fuses the power distribution line contains and check for voltage at both sides of each fuse. Although you can technically check for blown fuses with a visual inspection or test light, a volt or ohmmeter is the more precise way to go about it. You need to check the voltage at both sides of each fuse, starting with the main, or battery, fuse.
Try inserting a good, properly rated fuse with your head unit — and amplifier — turned off. You can check for continuity between the dead side of the amp fuse and ground to be sure.
If it shows continuity, you will have to check the entire run of the power cable to locate where it is connected to ground. There are a few ways to determine which one is the culprit, depending on how your amp is installed and where the wires are routed.
The first step is to check if you can see a power wire that connects the distribution block to your amp. If it does, then the problem is in the power wire, and replacing it will almost certainly fix your problem. Many amps have built-in fuses that are user-serviceable, but tracking down the reason this type of fuse has blown, let alone fixing the problem, is a little more complicated than simply looking for a shorted power wire.
This can be caused by hooking up the power backward, connecting a speaker or speakers with impedance too low for the amp, or simple component failure arising from time and normal use. However, there are a lot of different internals — like the transformer winding, rectifiers, and other components — that may have gone bad.
In fact, bad speakers or speaker wiring can even cause this type of fault — if the fuse only blows when the volume on the head unit is turned up. Out of all the various reasons an amp can fail, the most common is bad output transistors.
You may find that the power supply is bad, though, which is typically more expensive. Jeremy Laukkonen. Facebook Twitter LinkedIn. Updated on November 13, Michael Barton Heine Jr. Lifewire Technology Review Board Member.
Article reviewed on Dec 25, Tweet Share Email. In This Article. Check Voltages on Fuses. Blown Car Amp Battery Fuse. Blown Distribution Block Fuse.
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Diagnosing a Blown Car Audio Amplifier Fuse
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