08tahoe Posted January 23, 2016 Report Posted January 23, 2016 Either way you'll be fine because you only have a 200 amp alt and its not going to put out more than 200 amps anyway. But why get wire rated for about 300 amps and use a smaller fuse? You might as well just have wire rated for 200 amps and use a 200 amp fuse. Open up that little distribution block that your talking about and I bet you already have about a 200amp fuse in there stock.
sniperlif3 Posted January 23, 2016 Author Report Posted January 23, 2016 The reason is because from everything I have read. Even a 200A alt can push more than 200A at times, some going up to 250A peak. The distribution block on the car currently is stock and is probably only 120A. Which is my reason for worry. The stock alternator is built for Lap times and actually struggles when you need to run wipers, A/C, head lights, etc. Many people even say it struggles running aftermarket fuel pump at higher rpms. This and the fact of me getting 2 15s made me want to upgrade. I know from experience that alternators, even at their max, can produce more than their max output knows that I should not under fuse. That would be like putting a 200A fuse on a 200A alternator thinking it would survive. According to most fuse maker sites, it would last 3-4 tops hours at that rating, some even going as low as 20 min, it would eventually pop. That means at 4 hours tops of driving, it would pop and cause all systems to work solely off of battery. I want to prevent this and only rely on that short circuit pop. Not a random pop
Bayuk89 Posted January 26, 2016 Report Posted January 26, 2016 200 or 250 ur NOT gonna be drawing 200 amps all the time, the ALT just replenish the battery. If u install a 200 amp fuse its gonna take 220-240 to make it pop, could take 5 minutes could take 45 mintues but it HAS to but pulling over fuse rating for X amount of time to make it pop..... My opinion is to throw either 200 or 250 amp fuse (which ever one u feel better about) the fuse is to protect ur wire and ur electronics. Also as temp rises ur ALT puts out LESS amps anyway. I wouldnt worry about blowing a 200 amp fuse and being left with only battery power, honestly i think u will smoke ur coils before u blow ur fuse...... u have to be constantly railing ur subs to draw such current. Also like u said ur factory distribution block has a 120 amp fuse or so, it would be best to replace that with atleast a 175 amp fuse or if they dont have that size for a factory replacement then u need to add a fuse inline and just bypass that side of the of block and go to the battery side of the block. I would fuse 200 amp if it was MY car, i would be happier knowing if something bad happened electricly my fuse would pop ($3) verse my wiring catch on fire or amp melting down, or worse electrical fire is serious shit i got pictures of my co-workers suburban on fire because his starter wire from his battery grounded out and caught fire his truck is totaled now. Hope any of this helps you
sniperlif3 Posted January 30, 2016 Author Report Posted January 30, 2016 Sorry to correct you, but I said my stock alt was 120A output max which currently feeds straight to a kind of distribution block with a few standard 10-20A fuses then the wire goes to the battery. I am not to worried either way (200 or 250) I just want to be sure that if I put the 200 it would not pop early under a standard load from the alternator. Thank you all for the help. Currently waiting for my second fuse block and for the new fuses to come in.
Bayuk89 Posted January 30, 2016 Report Posted January 30, 2016 So that is for sure get a 250 A fuse? I currently have a 300A fuse. It is 1/0 OFC. From what I have read you want the fuse to be around 20% larger. The alternator is rated at 200A output during load. Would you still recommend the 250A? Earlier in ur post u said it was 200 amp alt ^^^^^ and everyone was talking about ur fusing with a 200 amp alt, so is it 200 amp or 120 amp alt ???
sniperlif3 Posted April 7, 2016 Author Report Posted April 7, 2016 You had mentioned my stock distribution block, which is currently setup with the stock alternator (~120A) then to my battery. I am upgrading the alternator (to 200A) and adding an additional 1/0 run from the Alt to the battery that bypasses the block and has probably 250A fuses, one on each end, all while maintaining the stock run of cable if possible.
Bayuk89 Posted April 8, 2016 Report Posted April 8, 2016 Shit man its been over 2 months where you been lol ?
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