hmm...that might be your problem
Alpine - ASE (local) - Batcap - CT Sounds - eD - Excessive Amperage - Powerware - Rainbow
I say grounding also
Whats the voltage with the car on? I never saw that, but prob not the issue as from what I under stand with the truck not running your getting a V drop of almost 1volt(from 12.6x down to 11.8v) or is that with the truck running, which would mean something is no good.
May have to run another 1/0 ground up to the front
03 Dodge Stratus Coupe SXT
89 Dodge Spirit 10's or Bust!!
You said your wire you bought off of Ebay what is the brand of wire since i know that companies like Pyramid,Rampage,Legacy,Lanzar to name a few when you buy from them a 4 guage kit when you get it its more like 8-10 gauge i dont know if that might be your prob but i would check it out.
Ground amps to the rear batt.
If possible do a ground run from front to rear batt. This should solve all of your issues.
HU: Pioneer 880-prs
Mid/High Amp: MB Quart DSC4125
Front Stage: PG mids/Vifa tweets running active
Sub Amp: DD Z1
Sub: 10" Mach 5 SPL/Hybrid 1.25ft^3 @ 38hz
DC Power Alt
But yes, the voltage drop I described was with the car on.
RUN 0 gauge and check all ur grounds also get a dmm and check ur alternator
-Grounded the amps at the battery, didn't help.
-Tossed in a buddy's 110ah battery to see if it was the battery was bad, I was still dropping to 12v. So rear battery I had in must be fine.
-Took the rear battery out, and the voltage drop did not change at all, or at least, very very little. Still dropping to 11.8-9.
-Checked various voltages. At full tilt I'm dropping to 11.8 at the amp, 12.0 at the in side of the distro for the amp, and 12.8 at the rear battery. Somehow I'm losing 1v between the battery and the amp, yet why should I even be dropping to 12.8 at the battery in the first place?
Alt not charging perhaps? If not then I give up
Yes, a small difference. All my connections are soldered...
I'm talking about with the car running.
Where exactly is your rear batt grounded in the bed?
To the bed of the truck, paint sanded and bolted down. I know it's not to the frame, but my frame is rusty and I didn't think it mattered because I was getting the same resting voltage on both batteries.
You need to listen to people and ground your rear battery somewhere else. The bed of a truck is not a good ground. Many people (such as yourself) fail to realize how important the ground is in a car electrical system. I really think this will solve the problem of the voltage difference.
2003 Chevy Silverado Ext Cab
Head Unit: DNX-9960
Mids/Highs: (2) pair of ID CXS64 V.2
Mids/Highs Amps: American Bass SQ-945
Subs: Pair of DC Lvl 5 18s
Sub amp: American Bass 700.1
260 amp Iraggi alternator (6) neg/ (6) pos Kicker 1/0
D2400 Under the hood (6) D3100s, XS Power VCM