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Problem fusing my grounds
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<blockquote data-quote="keep_hope_alive" data-source="post: 7079966" data-attributes="member: 576029"><p>You suggest that only fusing the ground wire provides protection? really? when the entire car metal is a ground plane, where do you fuse that circuit to provide over current and short circuit protection? you can't fuse once at the battery ground because of the fuse size. fusing at the ground connection is pointless since the positive wire isn't protected and subject to damage. we fuse positive wires at the source because of the ground plane. polarity doesn't matter - the car metal could be 12V and all wires ground wires and we'd fuse ground wires then.</p><p></p><p>we don't fuse positive wires because they are "positive wires". we fuse them because they are subject to shorting on metal.</p><p></p><p>i'm NOT grasping at straws. i'm trying to help you understand fundamental electrical theory, and sadly failing at teaching you something.</p><p></p><p>do you contest that a difference in potential on the grounding system is a source of noise (by AC signals being able to live on that potential difference)? or is this a concept you don't know about yet?</p><p></p><p>do you contest that fuses and the connections add resistance?</p><p></p><p>do you contest that resistance + current = voltage drop?</p><p></p><p>do you contest that adding voltage drop across a ground is a bad idea?</p><p></p><p>in the end i think you're going to learn something here, so good is being done. and hopefully you won't go around fusing grounds and not positive wires.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 7079966, member: 576029"] You suggest that only fusing the ground wire provides protection? really? when the entire car metal is a ground plane, where do you fuse that circuit to provide over current and short circuit protection? you can't fuse once at the battery ground because of the fuse size. fusing at the ground connection is pointless since the positive wire isn't protected and subject to damage. we fuse positive wires at the source because of the ground plane. polarity doesn't matter - the car metal could be 12V and all wires ground wires and we'd fuse ground wires then. we don't fuse positive wires because they are "positive wires". we fuse them because they are subject to shorting on metal. i'm NOT grasping at straws. i'm trying to help you understand fundamental electrical theory, and sadly failing at teaching you something. do you contest that a difference in potential on the grounding system is a source of noise (by AC signals being able to live on that potential difference)? or is this a concept you don't know about yet? do you contest that fuses and the connections add resistance? do you contest that resistance + current = voltage drop? do you contest that adding voltage drop across a ground is a bad idea? in the end i think you're going to learn something here, so good is being done. and hopefully you won't go around fusing grounds and not positive wires. [/QUOTE]
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