To fuse or not to fuse

[rebelfromva 10+ year member]

We ate talking about adding big three to stock wires. To remove stock wires or keep them but I will be keeping them

 

[knukonceptz 10+ year member]

If your battery wire passes through the cabin of the car/truck, you want to fuse it. If the battery is in the rear, you'll want to fuse it near the battery. If the car is off, the ALT makes no power (its not turning), yet the battery is holding power. You can fuse both ends to cover all aspects if you'd like. I suppose in an accident the car could maintain idle and the ALT would still generate power.

 

[rebelfromva 10+ year member]

What size fuse would you guys use one the alt to Batt wire 300?

 

[butterMilk 10+ year member]

Im about to use a 250a fuse, just what I had laying around. 300a should be fine. I see some people don't even fuse the battery to alternator wire, better safe than sorry. Always leave stock wiring incase your fuse blows.

 

[rebelfromva 10+ year member]

Im about to use a 250a fuse, just what I had laying around. 300a should be fine. I see some people don't even fuse the battery to alternator wire, better safe than sorry. Always leave stock wiring incase your fuse blows.

will be leaving stock wiring but my batt is in the trunk that's why it is being fused

 

[TheUnderFighter 10+ year member]

What size fuse would you guys use one the alt to Batt wire 300?

You fuse for the size and type of wire............ How is this not known yet?

OFC 1/0 = 300a

CCA 1/0 = 250a

 

[xSPLoder 10+ year member]

so if I upgrade to a ho alt is it still ok the leave that factory wire from alt to batt in addition to the 0g?

yes

 

[rebelfromva 10+ year member]

You fuse for the size and type of wire............ How is this not known yet?
OFC 1/0 = 300a

CCA 1/0 = 250a

thank you sir.

 

[xSPLoder 10+ year member]

What size fuse would you guys use one the alt to Batt wire 300?

250 or 300. Im using 250a on a pure copper industrial wire thats 2ga on my big 3. no problems yet

 

[TheUnderFighter 10+ year member]

250 or 300. Im using 250a on a pure copper industrial wire thats 2ga on my big 3. no problems yet

But that's 2 gauge, so that's probably appropriate for OFC 2 gauge. Under fusing isn't a problem. That just means you need to get a new fuse if you blow it. Over-fusing is when you risk your safety.

 

[xSPLoder 10+ year member]

But that's 2 gauge, so that's probably appropriate for OFC 2 gauge. Under fusing isn't a problem. That just means you need to get a new fuse if you blow it. Over-fusing is when you risk your safety.

Thing is though is this 2ga is pure copper 2ga thats the size of ofc 1/0ga. It was from a fork lift battery terminal connection LOL long story of how I got it