I have a 2004 mercury mountaineer. the car battery has power but i need a jump to start up. I was told there is a 12mm wire or gauge that needs to be tightend on the battery. where is it and how do i

Make sure ur battery has 12 15 vdc and if not battery is ur problem also check ur starter by getting underneath and while someone is trying to start it give it a few good wacks with a heady pipe or crowbar

who sed there is any kinda wire on the battery? if u can't see it , it ain't there?! try this! take all the extra stuff off the key ring, so that u r only holding the key and the keyfob.[keyfob= KLICKER] now start the car? if there is still a no-start condition, then reprogram the key/and fob.PROCEDURE: insert key with fob only. switch the key off/on 8 times. when u r on the 8th time in the ON POSITION, hold down any button the keyfob and hold down for a count of 30. then turn off; take out of key slot. then put back-in and see if this will start the car. it worked for my 2002 explorer!. lol.

Wire is measured in gauge. Check both terminal conectoins(ends) on both wires for tightness and corrosion.

Is the battery good in it?

sounds like the battery termanals need to be cleaned and tightend,have somebody wiggle the battery wires while you try to start it allso the clicking noise is comeing from you starter it is not getting anuff power to it.

check for bare wire on battery cable then check battery cable to starter and run wire if ok try hitting starter several good whacks if it starts then starter is bad put on new starter but replace solenoid first make sure connector is tight take a pliers and squeeze it a little so it is tight then try to start.

whoever replaced da battery didnt dew a good electrical inspection-i think your alternator is failing but 1st chec for loose or dirty wires-gauges help out alot-the battery shouldnt be dead overnite

Check fuse 17(15amp) in the interior fuse panel.

check the fuse

just be liitle more specificc please do you hear any noise when you try to start it? like a click or something?