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Here is a video that explains the fuse orientation in detail, so if you find it difficult to understand, please check it out! • "Maybe that insertion is the wrong way round?" Automotive power extraction fuse When I first posted this, 9 out of 10 people commented harshly. However, gradually more and more electrical experts commented in affirmation, and those comments were quietly deleted. I think it would be better not to write them in the first place if they were going to delete them... It is very dangerous to change the capacity of the tube fuse after branching to a larger capacity. Also, if branching from the power supply side (upstream side), if it gets caught in the wiring path to the tube fuse, or if the tube fuse holder is removed (dismounted), the metal part of the holder terminal will be exposed and may come into contact with the metal parts of the body. In this case, there is a risk that the vehicle's fusible link will break or, in the worst case, cause a vehicle fire. It may also affect other important vehicle safety electrical equipment branched off upstream. Also, if the fusible link melts, it is not easy to obtain it at car accessory stores. In the case of commercial vehicles, there are many disadvantages, such as the vehicle not being able to operate. In fact, should you use it on the power supply side (upstream) or the load side (downstream)? The answer depends on what you prioritize and what you care about. Both have their advantages and disadvantages. Therefore, there is no right or wrong answer. In general, it seems that the designation of the relevant equipment manufacturer is downstream. Which one to choose depends on the way of thinking of the person. However, isn't the top priority to avoid vehicle fires and melting of fusible links? Which would you prioritize? When I uploaded this video a year ago, I received many anti-comments and slander (such as ``Don't make nonsense videos to get more hits!''). At first, half of the comments were negative, but even when I explained the theory and exchanged comments, not a single person was able to convince me, and I was surprised that there were very few people who spoke from their own opinions or experiences, saying that the reasoning was because the manufacturer said so, or that a friend who graduated from electrical engineering said so. Eventually, people who truly understand electricity watched it, and most of the comments were positive. Please feel free to rebuttal or anti-comment, but I will return the comments, so please face each other properly and discuss them. There are too many people who just write nonsense comments and then leave them without even reading the replies. Please stop, it's annoying.