sniperlif3 Posted January 23, 2016 Report Posted January 23, 2016 So I have just purchased a new XS power battery and high output alternator that I want to try getting into my Skyline. The battery is located in the trunk. I already have the wires made up for all grounds and positives from the alternator to the battery. Little did I know that the positive from the alternator goes into a kind of distribution block prior to going into the battery. My question is, would I be able to run a larger size gauge from the alternator straight to the new battery and keep the old wire installed that goes from the alternator to the distribution block to the battery? Or should I be trying to wire up something else? My goal is to use what I have so any input would be helpful. I have not measured the previous positive but it looks to be either 2 or 4 gauge and the new wire that I have is a 1/0 gauge premeasured and the connectors are preinstalled. Thank you for any help
kandiman71874 Posted January 23, 2016 Report Posted January 23, 2016 Cable straight from alt to batt leaving the old cable is how you upgrade the big 3 positive anyway. But seeing as how you are having to run the entire length of the vehicle are you running this inside or outside of the vehicle? Being a driver vehicle and not a trailer queen, that wire should be fused in case of a rub through and short out condition and i would say it should be fused on both ends. Daily Driver 1999 Kia Sephia Kenwood DNX-893s Audison Bit One Processor 2 Dat 4.125's Sundown Audio SCV-6k Hertz hsk-165xl's Mids running active Focal V30 Series Tweeters running active Sundown Sa-8 v1's in the doors 2 Sundown Zv5 12's Lots of Hushmat Big 3+ and 3 + & 3- runs of Trystar 2/0 2 Dc Power Engineering 320 HP Alts 2017 Comp Vehicle 2006 Toyota 4 Runner Kenwood Excelon DNX-893s Audison Bit One HD DSP 4 Sundown Sa 6.5v2 Component Sets Focal Access 6.5 2 ways Sundown Audio Sax-50.4 Sundown Audio Sax-100.4 2 Dc Power 370xp Northstar agm27f Northstar agm65 2 Northstar asmagm 480's 2 Dual 1 Sundown Nightshade v3 12's 2 Sundown SCV-7500's All SMD Fuse Holders Shitload Of Sundown 1/0 120 sq ft Second Skin Damp Pro No, Its Not A Burp Truck!!!! 2016 Season 3rd place in Xtreme 1 At Finals 2016 Season 6th Place In Kaos 1 At Finals ( Blew The Subs Up In First Round Eliminations) 2 Kansas State Records Set In 2016 In Xtreme 1 And Kaos 1 In Midwest SPL David said: audio is a lifestyle, not a hobby newls1 I cant read a tape to save my life... 1/2's are ok, but other marks confuse me kingsuv only men who cant read a tape, take it in the ass kingsuv you sir, get a pink hard hat on jobsites
sniperlif3 Posted January 23, 2016 Author Report Posted January 23, 2016 Yeah a fuse will definitely be used. It is running under the vehicle, probably right next to the old cable now that you say I should be keeping the old cable anyway. Damn, I was always wrong about the BIG 3 upgrades I had heard about in the past. Guess that just made this question that much stupider. Anyway, for the fuse, is it better to be closer to the battery or the alternator?
Bayuk89 Posted January 23, 2016 Report Posted January 23, 2016 My opinion is to have one at each end and this is why..... a shorted power wire can happen at any place. If u fuse at the ALT only and ur power wire breaks under the car ur fuse will pop and protect the ALT but now ur battery isnt fused and WILL short out and or possible EXPLODE if ur runing 1/0 i would fuse 250 ANL under the hood for the alt and fuse 250 ANL as close to the rear battery as possible. 1/0 is good for atleast 300-350 amps if its OFC u always fuse LESS than what the power wire is rated for because if ur wire is rated for 350 amps and ur fuse is rated 350 amps there is a chance ur wire will fry before ur fuse blows..... not good. Also just incase ur wondering using 250 amp fuses at each end doesnt mean its 250+250=500 its still 250 amp fuse u just have two of them
sniperlif3 Posted January 23, 2016 Author Report Posted January 23, 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?
MotorCityFats13 Posted January 23, 2016 Report Posted January 23, 2016 fuses do not blow at their rated amps... its pretty much 20% over so the fuse does not pop all the time.... if the wire flows 200 amp do not add a 200 amp fuse because by time the fuse blows the damage is already done.... now if the alt is a 200 and the wire flows 250 then a 200 amp fuse is fine because the 200 would blow closer to 240 amps.... this is the reason they make fast blow / slow blow fuses for expensive electronics... and all of the automotive style fuses are slow blow
sniperlif3 Posted January 23, 2016 Author Report Posted January 23, 2016 So you would recommend a 200A fuse instead of even a 250A? Isn't the point to prevent a short circuit where the resistance becomes infinite causing a large amount of power to go through? So you would want something higher than the standard throughput so that if there is a short circuit then the fuse pops and does not have a chance of popping during normal operations? Sorry I sound like an idiot. I am new to wiring myself and want to be sure I do it all correct before installing. Gotta start somewhere.
08tahoe Posted January 23, 2016 Report Posted January 23, 2016 Fuse for the wire, the 300 amp fuse you have will be fine.
sniperlif3 Posted January 23, 2016 Author Report Posted January 23, 2016 Ok so i have 1 saying 250 and another saying 300. Can I get some other opinions. Id like to get more info.
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