1994 olds cutlass supreme volt gauge shows low I have a new battery and a new altenator could the both battery and altenator put out correct volts no drain on battery even change dash volt meter still in red

Sounds like battery terminal corrosion. Try cleaning the terminals and cable ends with baking soda and water and an old toothbrush, then add some dielectric grease and put the cables back on. If that doesn't help- check for bad battery cables: https://getjerry.com/questions/how-do-i-test-if-my-battery-cables-are-bad
If that all checks out, then your N.E.W (Never Ever Works) starter is very likely defective. Your alternator looks good and 12.6 volts on a new battery is just fine.

check the voltage regulator for faults
alternator running at 1500rpm has to put out a dc voltage of 14.5-14.8 volts
have the battery load tested a sit should maintain a voltage of no less than 10.5 under load conditions anything lower indicates bad cells in the battery

Probably one of the guages are reading out of range.

launched it and this is going to give u an idea whats is happening .cutlass supreme are very easy to understand ..sometimes is a real failure or sometimeis a wrong action of your driving and ecu detected it as a fail.. be more specific please

Have the out put voltage on you altenator checked, if it's fluctuating it may be going bad

you need to check and see with a volt meter if the alt is putting out anything if not make sure the wires in the back of the alt. have voltage coming from the fuse box you could have a problem as simple as a blown fuse

Do you mean the battery is draining overnight, and needs jump started? On your Olds, if this is the case...the starter has to be draining the battery...most likely a short...is it the original starter? Changing the starter on your Olds is not a big deal...:) Nice Car, if your Cutlass has gauges...(including Volts/Battery) the signal should show...toward charge when driving...The starter short is hard to confirm.

Could be .. did you do any voltage checks? I suggest you check altenator output as well as battery voltages under various circumstances.

It is the two or three wire connector on the top side of the alternator. Either a wire has broke before the plug or there is a problem with the plugs terminals. The dealer sells a repair pig-tail if you need it.

probably just a warning system in the car to get your attention many cars that have an alternator or battery thats going bad the temp gauge will jump up to hot soon as the problem is fixed everything returns to mormal