The fuse boxes on your Gallant would be under the hood on the drivers side, probably close to the battery.
The other one would be on the side panel (drivers side) of the dash on the side that faces the door. Often on the lid of the fuse box is a diagram for the fuses in the box.
Hope this helps!
〉 Answered on Jul 3rd, 2012 by Colleen McGee, Driving Instructor at Americas Driving School
google.com can usually provide a fuse/spec diagram but if no luck it might be best to consult Chilton's. They come in handy especially when it comes to owning an older vehicle. http://www.chiltondiy.com/