0ga big 3 fuse

[alfisti 10+ year member]

Hi, I have done big 3 upgrade today. Car: 97 vw polo

stock 90A alt - 72A batt.. new wire is 0ga and I want to fuse it. So I guess 100A fuse would be ok? and it should be close to alt right? Thanks!

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[negolien]

Fuse for the wire so like 240 to 270 lower won't hurt but might pop it. Google wire fuse chart but someone will chime in.

 

[mylows10 5,000+ posts]

Use 250 for cca and 300 for Ofc wires

 

[keep_hope_alive Premium Member]

size depends on the fuse holder and the fuse needs to be at the battery. 100A would be fine. the sizes recommended above by mylows are also fine. note it's a parallel path to the stock power wire from the alt so each wire only sees roughly half of the alt output. personally, i prefer a fuse sized for the expected usage so it blows faster in case a short happens.

the fuse is protecting the battery.

 

[alfisti 10+ year member]

that makes sense. 0awg was clearly overkill //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif I have only 1 amp(kicker zx1500.1) and with stock alt current will be low I think.

so 100A - 150A would be fine I guess?

Some people say fuse needs to be at alt... But fuse at the battery makes sense too. Ex: An accident and wire comes loose from alt and touches metal. If no fuse at the batt, battery=boom! right?

But what if wire is cut from half and touches metal. Alt will catch on fire?