Cdizzle Posted June 30, 2010 Report Share Posted June 30, 2010 I am driving a classic car, and I have a 12 volt set up and everything and the car has an alternator on it and everything. I have one battery in the car right now, but I wanted to run wires to the trunk and have another battery in there as well. I dont want to hook anything up to this second battery (like and amp or any other electronics in the car) I just want it to be used as a back up battery for the one under the hood. Basically so if the one under the hood gets low on juice when I am bumping at night with my head lights on and everything my stuff wont shut off or drop volts. What is the best way to do this?! Quote Damn Thiefs Link to comment Share on other sites More sharing options...
hdorre Posted June 30, 2010 Report Share Posted June 30, 2010 In parallel. Positive to positive. Negative to negative Quote On 5/8/2011 at 7:38 PM, Kranny said: On 5/8/2011 at 7:35 PM, 'Maxim' said: It hurts me inside when I read stuff like this and remember you're 15 LMFAO so true Mitsubishi 3000GT (Old Build) Headunit: Pioneer 80PRS Frontstage: (2) McLaren Audio MLT-2 Tweeters & (4) PRV Audio MR Series Neo 6.5" Mids Substage: 4 15" Hybrid Subs - Tantric Motors & Sundown Softies Amps: Banda 2.4D Amp (Tweets), American Bass VFL 350.4 (Mids), and (2) Ampere 3800s Electrical :Singer 260A Alt & JY Power Lithium 2005 Chevy Colorado Ext Cab Headunit: Pioneer 80PRS Frontstage: 4 PRV 700Ti Tweets & 6 10" Delta Mids on 3000wrms Substage: 6 Fi BTL 18s in a 4th Order Walkthrough on 3 Wolfram 4500s Electrical: Singer "390" and JY Power My Official Feedback Thread Link to comment Share on other sites More sharing options...
Autruche Posted June 30, 2010 Report Share Posted June 30, 2010 you can start by using this forums search function... but seriously dude, put the battery in the trunk, ground it and run a + wire up from the battery up to the alternator... make sure you fuse the wire at both ends and maybe just leave one fuse out until battery 1 dies then put the fuse in to connect it... but, idk... Quote Need Test Tones/Sine Waves? Click Here!My Saab 9000 build1993 Saab 9000 Aero 5spdPioneer - Zapco - Hifonics - Sundown Audio - O2 Audio - RE AudioJust Say No To Rear SpeakersJust Say No To CCA WireReal Men Drive StickHit me up on Facebook, if you want Link to comment Share on other sites More sharing options...
tomypg Posted July 1, 2010 Report Share Posted July 1, 2010 No need to run a switch, if you have two good batteries you could bump for HOURS and still start, I have done it with two batteries, head lights on for 3 hours, started right up. Positive to Positive, then ground the the Chassis or run another ground wire. Quote 1988 Honda City E Big 3 in 1/0 Venom 6x9 Venom 6.5 Components Response 4x100 midz and highs amp Fusion NV 2500.1: STOLEN 2 x 12 inch fusion nv subs 10 inch 5 doller subs in my doors PM me if you want help with electrical Link to comment Share on other sites More sharing options...
Cdizzle Posted July 1, 2010 Author Report Share Posted July 1, 2010 (edited) So there is no need to run the NEG from the battery? I can just use the amp wire I have ran to the trunk from under the hood and I should be fine as long as I ground the trunk battery in the trunk and hook the POS wire from the hood battery to the POS on the trunk battery? Also there is no need to add a battery isolator? And there shouldnt be any problems with my charging system? Edited July 1, 2010 by Cdizzle Quote Damn Thiefs Link to comment Share on other sites More sharing options...
skittlesRgood Posted July 1, 2010 Report Share Posted July 1, 2010 So there is no need to run the NEG from the battery? I can just use the amp wire I have ran to the trunk from under the hood and I should be fine as long as I ground the trunk battery in the trunk and hook the POS wire from the hood battery to the POS on the trunk battery? Also there is no need to add a battery isolator? And there shouldnt be any problems with my charging system? it is better to run the negative from front to back batteries but grounding it in the back will work fine. what size is the + wire you already have? the isolator only saves the front battery from draining while the car is off. its like an idiot switch. if your stupid and you run your battery dead all the time... you need the idiot switch lol. Quote If I answered you in a well mannered, informative way, you asked a good question or had a good attitude. If I was an asshole, you asked a stupid question or you had a fucktard attitude... or I was in a bad mood. Team BassickHU: Pioneer AVIC Z110Front: Peerless SLS 6.5", Peerless HDS 4", Rainbow tweeter - running activeAmp: JL HD600/4 and DC 4 channel (bridged to midbass)Processor: JBL MS-8Subs: 2x 12" AA MayhemsAmp: DC 3kElectrical: DC power 270xp alt. 1/0 big 4. XSpower D3400 and six D680s. http://www.stevemeadedesigns.com/board/topic/121795-29-update-the-buick-is-getting-a-rebuild/ Top career scores: DBdrag 151.7 MECA SQ 82.25My SOTM build Yeah. im pretty sure they dont warranty retarded people. Link to comment Share on other sites More sharing options...
Cdizzle Posted July 1, 2010 Author Report Share Posted July 1, 2010 it is better to run the negative from front to back batteries but grounding it in the back will work fine. what size is the + wire you already have? the isolator only saves the front battery from draining while the car is off. its like an idiot switch. if your stupid and you run your battery dead all the time... you need the idiot switch lol. 4 AWG wire is already ran to the back. I dont ever listen to anything or have anything running when the car is off so I dont run my battery dead intentionally. I just need extra juice for at night when I run the HID'S subs, stereo, dash lights stuff like that... It drops right now from 14.4 to less then 11v, I believe cause my front battery has a dead cell. Runs fine in the daytime though. Quote Damn Thiefs Link to comment Share on other sites More sharing options...
kandiman71874 Posted July 1, 2010 Report Share Posted July 1, 2010 Replace the battery in question with the dead cell first and then move on to a h/o alt. Quote 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 Link to comment Share on other sites More sharing options...
Cdizzle Posted July 17, 2010 Author Report Share Posted July 17, 2010 Alright, just got the battery today... Since I already have the wire ran back there, how big of a fuse to I need to put on the 4awg wire up by the battery that is under the hood? Quote Damn Thiefs Link to comment Share on other sites More sharing options...
Cdizzle Posted July 19, 2010 Author Report Share Posted July 19, 2010 Bump Quote Damn Thiefs Link to comment Share on other sites More sharing options...
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