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<blockquote data-quote="loopkiller" data-source="post: 5755117" data-attributes="member: 601690">Actually, here is my take on the whole fuse or not fuse the POS+ alt wire debate.1) If this wire needs protection from over current, then a single fuse will do the trick. It does not matter if you have more than one for this purpose and it does not matter where it is located.2) If you want to protect this wire from dead shorts, then you have to consider where the short might occur. Since both ends of the wire are a potential source of POS+ power, then one would assume that you need a fuse at both ends. Let&#039;s consider the scenarios:a. The wire is severed near the battery and that end contacts ground. The power from the alt is now dead shorted. A fuse near the alt output is necessary to protect against this type of short.b. The wire is severed near the alt and that end contacts ground. The power from the battery is now dead shorted. A fuse near the battery output is necessary to protect against this type of short.So in the end, if you simply want to protect against excessive amperage on the wire leading to a fire, one fuse at either will do. If you want total protection against shorting and over current, you will need one on each end of the wire.If you don&#039;t mind your car looking like this picture, you don&#039;t need any fuses:<img src="http://www.decultured.com/blog/blog_images/CarFire_B69D/car_fire_1_3.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="loopkiller, post: 5755117, member: 601690"] Actually, here is my take on the whole fuse or not fuse the POS+ alt wire debate. 1) If this wire needs protection from over current, then a single fuse will do the trick. It does not matter if you have more than one for this purpose and it does not matter where it is located. 2) If you want to protect this wire from dead shorts, then you have to consider where the short might occur. Since both ends of the wire are a potential source of POS+ power, then one would assume that you need a fuse at both ends. Let's consider the scenarios: a. The wire is severed near the battery and that end contacts ground. The power from the alt is now dead shorted. A fuse near the alt output is necessary to protect against this type of short. b. The wire is severed near the alt and that end contacts ground. The power from the battery is now dead shorted. A fuse near the battery output is necessary to protect against this type of short. So in the end, if you simply want to protect against excessive amperage on the wire leading to a fire, one fuse at either will do. If you want total protection against shorting and over current, you will need one on each end of the wire. If you don't mind your car looking like this picture, you don't need any fuses: [IMG]http://www.decultured.com/blog/blog_images/CarFire_B69D/car_fire_1_3.jpg[/IMG] [/QUOTE]

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