14Fusion Posted November 5, 2015 Report Share Posted November 5, 2015 I have a Singer 240A alt and an XS power D1200 up front and a XS power D5100 in the rear. I have a run of Sky High 1/0 to the rear for positive (250A fuses on both ends) and a solid ground on the batteries with the same wire. Big Three done. The issue is that in the front I have 14.8V but when I check the rear its 12.1V. Then when I disconnect the rear battery the wires to the rear are at 14.8V again. Any thoughts on what I screwed up? Link to comment Share on other sites More sharing options...
mcfalcon Posted November 5, 2015 Report Share Posted November 5, 2015 Do you have a negative run from front to back? Still learning but have started gathering. Link to comment Share on other sites More sharing options...
crispy_chick3n Posted November 5, 2015 Report Share Posted November 5, 2015 Do you have a negative run from front to back? ^^^this This page is crispy_chick3n approved. © crispy_chick3n inc Link to comment Share on other sites More sharing options...
14Fusion Posted November 6, 2015 Author Report Share Posted November 6, 2015 No... I assume that grounding to the car is where my issue is then? Link to comment Share on other sites More sharing options...
gckless Posted November 6, 2015 Report Share Posted November 6, 2015 No... I assume that grounding to the car is where my issue is then? Sounds like it. Fix that first before looking into other things. "Clipping" is the biggest forum boner now. It's like witchcraft... it automatically explains just about everything people don't understand. My build log: http://www.stevemeadedesigns.com/board/topic/200295-gckless-2011-chevrolet-impala/ High resolution photos: Gilbert Kless Photography Link to comment Share on other sites More sharing options...
d-nice88 Posted November 6, 2015 Report Share Posted November 6, 2015 so you need to have a positive run and a negative run from front to back ? you cant just ground the rear batt to the chasis of the vehicle? Link to comment Share on other sites More sharing options...
MotorCityFats13 Posted November 6, 2015 Report Share Posted November 6, 2015 so you need to have a positive run and a negative run from front to back ? you cant just ground the rear batt to the chasis of the vehicle? In most cases you can "I have never needed a additional ground path" but if you have an issue like the OP then the next trouble shooting step is to check / redo grounds and then run a dedicated ground path Link to comment Share on other sites More sharing options...
crispy_chick3n Posted November 6, 2015 Report Share Posted November 6, 2015 running a ground from front to back is good for clean power transfer. especially considering that power flows from negative to positive. This page is crispy_chick3n approved. © crispy_chick3n inc Link to comment Share on other sites More sharing options...
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