1995 cadillac eldorado with new battery ran good one day and the next day would not start, no warning display, no lights, no nothing but a faint 'buzzing' sound when the key is turned in the i

SOURCE: wont start help!

Recheck the charge on the battery,make sure it's fully charged.Check all connections at the battery and at the starter.Possibly a bad starter.If the starter is ruled out,then look at the teeth on the flexplate/flywheel.I would remove the starter and test it.

SOURCE: 1995 cadillac eldorado battery volts low

i know you dont want to hear this, ck alternator output, if it is above 13.25 your are in business any lower replace it be sure alternator is wired correct on back

shack

SOURCE: 2002 Cadillac DeVille wont start (even w/new battery!)

well first off, check the glove box light blub, make sure it shuts off when you close the door, check it by pressing the switch with your finger to make sure it shuts off, also check under the hood for the light there if there is one, pull the bulb, and the same thing for any bulb in the trunk, then check again after a day to see if the battery dies, if it is dying while the vehicle is not running then it is the battery, if it is dying after it is running then it is the alt. you can check that also tho with a multimeter set to the DC volts setting, place the black end <the ground to any grounded area> and the red end <the hot lead to the back of the alt. > it should be reading higher then 12 volts, normally should be a higher reading then 12 volts... if you are getting a lower reading or just 12 volts then the alt. is bad and needs to be replaced...hope this helps you out...