How to install them: These window accelerators are very easy to install. You remove the inner door panel (just the lower section if the door panel is several pieces). Generally there is a speaker in the door. Remove the speaker. Behind the speaker will generally be the 2 wires going to the electric window. You will cut both wires and add this window accelerator to the existing wires. The black wire from the box goes to a good ground. Generally to a bolt that is close by. Click here to see a typical installation.