Originally Posted by pickleseimer

There are many good ideas on how to hook them up. One example is the attached picture giving you an idea of how I attach my Ctek to my C5. The C6 and C7 also have similar (but not identical) attachment points under the hood in the same area.

The Ctek comes with an attachment harness that has eyelets on the ends. I attached the red lead to the positive bus on the underhood fuse box, slipping the eyelet over the post and using a second nut to snug it down. For the negative side, the C5 has a bracket that attaches the hood stop bumper to the firewall area. I attached the negative black lead on the Ctek harness to the stud/nut that holds this bracket to the frame (in the picture this is just under the bracket), verifying with an ohmeter that this is a ground. When getting ready to take the car out, just disconnect the Ctek, slip the provided cover over the harness connector attached to the car, quick visual check everything is buttoned up and normal, close the hood and go.

On my cars that use the Cteks, I attach them all to the car under the hood using the eyelet harnesses, as I mount the Cteks to a wall and want them all to hook up in the same location.

Originally Posted by REDHOTS

If I'm leaving a maintainer on 24/7 all winter, I plug it in to a timer and have it just on for a hour, or two per day. The rest I just move around from one battery to another whenever I think about it.