Mr.Scary Posted July 11, 2015 Report Share Posted July 11, 2015 ok I got 2 batteries. in series.. new grounds.. powermaster 225 amp 14.8v alternator.. all 0 guage stinger wire.. for some reason im only getting 12.5v... and I cannot figure out WTF is goin on.. anyone else see weird behavior like that? oh yeah, one of my batteries is brand stinkin new.. today Quote Link to comment Share on other sites More sharing options...
jovanny Posted July 11, 2015 Report Share Posted July 11, 2015 Did you do the big 3 ? Quote Link to comment Share on other sites More sharing options...
Mr.Scary Posted July 11, 2015 Author Report Share Posted July 11, 2015 yup. .years ago Quote Link to comment Share on other sites More sharing options...
jovanny Posted July 11, 2015 Report Share Posted July 11, 2015 dissconect a battery and check the voltage Quote Link to comment Share on other sites More sharing options...
Mr.Scary Posted July 11, 2015 Author Report Share Posted July 11, 2015 did that.. they're both showing 12.5 volts.. or about that anyway.. but then I run the truck.. I see 14, then it sucks down to 12.5.. almost like im running on batteries only with no alternator..but I had the alt tested and it tested fine. Quote Link to comment Share on other sites More sharing options...
jovanny Posted July 11, 2015 Report Share Posted July 11, 2015 My 07 Tahoe does the same thing , I read something about the alt not kicking in at idle , except my lights flicker bad My 07 Tahoe does the same thing , I read something about the alt not kicking in at idle , except my lights flicker bad Quote Link to comment Share on other sites More sharing options...
EXGM Posted July 11, 2015 Report Share Posted July 11, 2015 What kind of batteries do you have? Are they both the same ( flooded or agm)? Quote Link to comment Share on other sites More sharing options...
Mr.Scary Posted July 11, 2015 Author Report Share Posted July 11, 2015 both the same Optima red top 1000 CCA Quote Link to comment Share on other sites More sharing options...
Doughty08 Posted July 11, 2015 Report Share Posted July 11, 2015 Not sure if u made a typo when saying you had them hood in series but they should be hooked in parallel to obtain 12 volts and the alternator to charge both batteries, if hooked in series then you should have 24 volts an a fried electrical system. I'm hoping typo. Quote Link to comment Share on other sites More sharing options...
Mr.Scary Posted July 11, 2015 Author Report Share Posted July 11, 2015 yeah typo.. sorry.. was very very tired lol Quote Link to comment Share on other sites More sharing options...
EXGM Posted July 11, 2015 Report Share Posted July 11, 2015 Did you have same kind before or a mix? Agm or wet or both agm? Quote Link to comment Share on other sites More sharing options...
Mr.Scary Posted July 11, 2015 Author Report Share Posted July 11, 2015 both AGM.. both Optima Red Tops Quote Link to comment Share on other sites More sharing options...
fast4popper Posted July 11, 2015 Report Share Posted July 11, 2015 Don't forget to mention you may have torched some wires from the underhood fuse/distribution area, to the motor. I've been telling you since day one to check them wires when you replaced the power steering hose. But hey, what do I know. ? Quote Link to comment Share on other sites More sharing options...
0patience Posted July 28, 2015 Report Share Posted July 28, 2015 If you bring the RPMs up, does it kick back up to 13+ Volts? If it does, what rpms are at idle? Or does it sit at 12.5V?If the alternator checked out (I'm assuming you bench tested it), are you using the dash guage or a meter at the alternator on the truck?I'd connect a DVOM meter (Fluke 87 or 88) to the battery terminal on the alternator and see what you get.If it's still showing 12.5V output, then it is either the signal to the alternator (small plug on the alternator) or the regulator is having a short or problem.If you are going by the dash gauge and it shows full voltage on the DVOM at the alternator, then your dash gauge may be going south. One of the tiny wires to the alternator should be the signal wire.I don't have a schematics handy right now to tell which one, but pretty sure it would be the same as a standard chevy truck (SS w/6.0L are new to me, so I'm guessing), but the signal wire charges/activates the regulator. Quote Link to comment Share on other sites More sharing options...
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