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Crescent wrench, funnel, pan & possibly an oil filter wrench if it's on there tight.
it should be a 10 millimeter
9/16
use a 10mm wrench and remove the battery from the trunk compartment, and replace it with the new battery
Jack-up, wrench, anyway, it's very difficult to change it
Battery is under seat. Remove rear seat first with an Allen wrench then using same wrench remove front seat use Phillips screw driver or 10mm wrench or socket to remove cables from battery. Reverse these directions for installation and assembly.
In that period most Cadillac calipers were held by 15mm bolts.
The bolts on the starter take a 5/8 inch wrench. The battery cable is a 13mm wrench.
It is a 5/16" or 8mm wrench. There is no really set wrench for a side terminal battery as long as the wrench makes full contact with the head of the bolt. Many parts stores offer a ratcheting wrench as a side terminal battery wrench, which is essentially nothing more than a 5/16"-8mm wrench that ratchets for tight spaces
USUALLY THERE IS A MOUNTING BAR ABOVE THE BATTERY -FIRST TAKE THAT OFF THEN TAKE VISE GRIPS OF A WRENCH AND DISCONNECT THE BATTERY PUT THE NEW ONE IN.
10mm wrench and very small hands
you have to remove the drivers side tire, remove several screws that hold the plastic cover in place, behind the cover is the battery. It is held in place with a battery strap, use a 5/16 wrench to undo the battery terminals. wiggle the battery out the hole.