jessdabest77 Posted March 20, 2015 Report Share Posted March 20, 2015 This is all in a 1994 Honda Accord.Red top Optima upfront,one run of negative and positive 0 gauge wire from front battery to secondary battery in trunk,second battery is a XS Power D31,Hifonic's 1000 watt four channel amp,AQ2200 watt amp,and two twelve inch Sundown SA sub's. The problem,is with the car on,front battery read's 14.3 volt's,and XS Power battery read's 11.2 volt's. I have done the big three,sent the battery back to XS,and they said it's fine,and had my amp tested at Soundquebed,and amp is fine. My question is,why such of a big voltage difference. Please help,what to do. Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted March 20, 2015 Report Share Posted March 20, 2015 Check your grounds, you may want to ground the rear battery to the nearest strut tower for starters. Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
jessdabest77 Posted March 20, 2015 Author Report Share Posted March 20, 2015 Ok,It's weird cause my truck has the same run but the voltage is the same. Link to comment Share on other sites More sharing options...
SIDE SHOW Posted March 20, 2015 Report Share Posted March 20, 2015 what? Link to comment Share on other sites More sharing options...
jessdabest77 Posted March 25, 2015 Author Report Share Posted March 25, 2015 Ok,I changed the ground wire in the back,where the second battery is,grounded it to the strut,and still lower voltage. What else should I do? Link to comment Share on other sites More sharing options...
magillaru Posted March 25, 2015 Report Share Posted March 25, 2015 Post some pics of your grounding locations..... Singer Alternators Team Asshole #anothershittysingerbuild Link to comment Share on other sites More sharing options...
reedal Posted March 25, 2015 Report Share Posted March 25, 2015 What you should do is use that DMM that you're using to read voltage for the batt's, take it, set to read resistance, touch the leads together to see how much resistance they read first, then put one lead on the battery's negative terminal, put the other on your current ground, and that number needs to be as close to zero as you can get it (minus the .1 or whatever amount your test leads gave you.) That's continuity. That's how you find where you need to ground. If it's reading 1ohm or more, that's bad juju. Find a good ground. SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
FuriousG Posted March 26, 2015 Report Share Posted March 26, 2015 You never mentioned a fuse on your positive run to the back, if you have one check to see if it's open. Alternately, disconnect the positive run at the back battery and test for voltage at the positive cable. Link to comment Share on other sites More sharing options...
islandpride684 Posted March 26, 2015 Report Share Posted March 26, 2015 Check the positive connection at the main battery, check voltage at the positive wire in the rear without it being connected to the rear battery and tell us what it reads...what is the resting voltage of the rear battery with nothing connected to it? My guess is you got a bad power wire.... Build Log http://www.stevemeadedesigns.com/board/topic/186921-blk9te-07-yukon-slo-mo-build/page-3?hl=%2Bblk9te#entry2881410 Link to comment Share on other sites More sharing options...
magillaru Posted March 26, 2015 Report Share Posted March 26, 2015 Bad ground or like "Islandpride" mentioned, bad connection with a power wire. You sent the battery back to XS and they said it was fine so check ALL connections and wires, make sure everything is tight and grounds are connected to bare metal. Singer Alternators Team Asshole #anothershittysingerbuild Link to comment Share on other sites More sharing options...
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