Need more info, need to know what the problem is.
Should have access after removing inner door panel
Listed on the driver's door post.
The TBC fuse is for Truck Body Control. It is for the interior lighting and door locks.
Are the door interchangeable on an 1987 chevy truck and an chevy blazer 1988
YES.
yes it should fit
Slide in under the truck behind the drivers door and look up inside of the frame and you will see it.
You take it to an auto shop and have them do it
The switch might be bad or the wire isn't getting the right connection with the battery. Or the wire is just shot in general.
YES. That would be a direct swop.
Key?
It is behind the back door and have a switch.