Battery issues
Remove the negative battery cable. Get a test light and stick it in the battery cable and clamp the clamp lead end to the negative battery post. If the battery has a draw, the test light will light. Position the test light so you can easily see it from the driver's door. Get at the fuse box and remove fuses one at a time until the light goes out. when you find the fuse that puts the light out, there is your affected circiut. If the light does not go out from the fues box, get under the hood and remove positive leads from the starter and alternator because it will probably be one of those if none of the fuses cuts the light out.