Went and had a charging tst, battery load test and code test done, everthing came out good, only codes was o2 downstream and knock sensor. Went on a 40 mile drive now battery is at 12 not running and 11.8 running
Replacement parts, especially rebuits can be BOOTB Bad Out of the Box. A turning tensioner doesn't mean it is applying enough tension. I replaced one on my 2004 E thatn never squeaked, and kept smoothly turning. Found it when I was needlessly replacing the serpentine belt and checked the position after the new belt was installed. Eyeballs are poor measuring tools, even mine.
At this point I might suspect bad connections or the battery. I would question the measuring techniques that you are employing and your assumptions.
To eliminate all of them systematically in order of ease:
Disconnect the battery. Remove the top caps and check the electrolyte level. If it is low (the top of the grid is above the fluid) in some but not all of the cells, the battery has some damaged cells. Plan to replace it.
If the electrolyte is slightly low in all the cells, the battery has been overcharged at some point, or not properly filled at time of installation and/or not properly maintained. Add distilled water to bring each cell up to the fill indicator.
Clean the posts and attach a current adjusting battery charger to the battery. A commonly available charger of this type will have selectors for battery capacity and voltage, plus indicators for the approximate charge level.
Let the battery charge overnight or until the charger automatically drops to a maintenance level (<2a) and stays there. Some chargers will cycle through levels While it is charging check the voltage across the chargers attached clamps. You'll see it varies up as it charges, and down as it tests to see how the battery has responded..
Disconnect the charger , wait 10 minutes, then check the battery voltage with a DVM. It should be above 12.5v, wait one hour and check the voltage a second time. It should be above 12.4 volts. If it isn't, the battery has an internal defect. (Reattach the charger and observe how long it takes to reach full charge.)
If the terminal voltage is above 12v, clean the battery clamps inside surface, Disconnect and clean the ground cable connections at the fender and on each side of the engine. Visually inspect the each cable abobe the crimpedbon connector for any signs of exposed conductor that is green. Green indicates a conductor that is failing and may have or be developing a high resistance connection within the connector. If so, measure the cable resistance with your DVM. the cables should read as near shorts. Replace the cable or the terminal if resistance is above one ohm. Apply some petroleum jelly to each connection to inhibit corrosion
Immediately measure the terminal voltage. The Element normally draws a low current ,(ma) even when off to maintain things like the battery code, Maintenance Minder calculations and some ECM codes. All these will have been lost with the battery removed. Any ODB codes stored after a battery replacement indicate new, recent errors. (A $15 ODBII adapter, or a better one, should be part of a modern diyers toolkit. )
Start the engine and watch the terminal voltage. When cranking the terminal voltage will drop. Once the engine is up to fast idle (+1500 rpm) the alternator output should be high enough to produce 14v across the battery to carry the engine load AND RECHARGE the battery. Until the power consumed to start the engine has been replaced, the battery terminal voltage will be below the level it was at before starting.
With battery, connections and alternator no longer suspects, go under the dashboard and locate the primary cabin grounding lugs. If any of the connections to them are loose or corroded, one or more electrical systems will be non functional, intermintent, or in the case of the ECM, give erroneous or misleading readings and produced erratic performance.
Those grounding lugs are on the inner steels fenders G501 and G502, which are easy access, and near the center of the dashboard, G503, G401, G402 and G451, which are harder to get to.. The last one is the ECM ground.
Now that the Element shop and troubleshooting manuals is available on CDROM, legally and affordable from Bishko, through Rockauto, there's no excuse for not having one. For less than a tank of gas, it's one of the best tools you can own. I have copied mine to my tablet and to a USB stick that I keep in the glovebox with my ODB adapter.