Each of these ECUs plays a specific role in a safe and seamless driving experience. So, instead of burning these costly electronics or electrical components whenever there’s an overcurrent, auto manufacturers design fuses to take the shot.Īuto manufacturers equip hundreds of ECUs in modern cars. In a real sense, the key electrical component is way costlier than the fuse. When there’s a ground fault or short circuit issues requiring the key component to draw higher voltage, the wiring on the fuse terminals will cut, preventing the overcurrent from traveling to the main circuit and damaging it. Example of components that requires 40 amperages in vehicles includes the AC fan, windows regulator mechanisms, electronic control units, ABS, and ignition system. Let’s start with the use of a 40 amp fuse.Ĥ0 amperage fuses in cars are used to protect electrical circuits or components that need 40 amperages from damage due to ground fault, an arc fault, short circuit, high current, or damaged wiring. In this article, the Rx Mechanic team will discuss what happens when they blow off, how to test 40 amp blown fuses, and replacement procedures. Therefore, if you suspect you have a blown 40 amp fuse, you may ask, what does a blown 40 amp fuse look like? Knowing how a blown fuse look is a good step toward fixing it. The higher the amperage, the higher the electric flow it transmits to the key circuit. You may have probably had a blown fuse if you’re a car owner. Unfortunately, it is common in cars and electrical appliances in our homes. It’s okay for a car fuse to blow at one point. A fuse is a protective device with two terminals and a thin wire or metal strip running across the terminals. They prevent high currents from damaging key circuits in a car. If no short, then the problem is internal of the amp.Fuses in cars and other electrical appliances play an essential role. If the fuse blows as soon as its replaced but without the attempting to turn the system on, you need to remove the B+ cable from amp and test for a short to ground between the fuse and the end at the amp. If the fuse blows when you try to power the amp up, then the problem is excessive current draw by the amp. I have a feeling that if you replaced the 40A fuse with a fuse thats greater then the sum of the amps chassis mounted fusing but not exceeding what the cabling can carry, you will find that the amp's fuses blow.ġ) does the fuse blow when there is an attempt to turn the amp on or as soon as power is returned to circuit fallowing the replacement of a blown fuse? I suspect there may be an internal issue in the amp due to the possible water intrusion and the 40A fuse is just the weak link in the system and doing its job. The fact that the system was working normal up until you got some possible water in/on the amp. If I were building a system with the potential current draw of the Syn-4, I would not have used a 40A fuse/breaker as I think thats a little light, but I do not think the blowing 40A is the root cause, but rather a symptom. Are you saying it draws 130A through 120A of fusing? How? Im not sure what you mean by "uses 130 amps". Theres nothing wrong with over-fusing just a little, but theres no advantage to it. Theres nothing wrong with matching the main cabling fuse to the amp's internal fusing. This may not be equal to the total internal fusing and thats ok. If the installer calculates the expected current draw based on the amps efficiency and the impedance load on each chnl, you can come up with an adequate fuse or breaker size. Amps rarely pull amperage equal to their max potential, even Class-A/B. The main cable fuse is there to protect the boat if there was a short in that amp cable between the battery and the amp. So why does the main fuse need to match the total of the amps internal fusing? Those fuses are there to protect the amp from over-current or other internal short. May be other issues with the amp but getting fuse sizing right should be first step. If you use a 40 amp, it will just blow when you turn up the volume very high. arc audio ks600.2 has 120 amps of fuses and uses 130 amps so needs a 150 amp fuse.īTW- theinstructions from the syn 4 installation part of the manual says to use a fuse equal to the fuses of all amps connected to the wire- meaning in this case a 75 amp fuse should be used. Because the fuse needs to match the sum of the amp fuses or max current spec from the mfg.
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