The 1998 Pontiac Transport with a 3.4L engine doesn't have a second fuse box in the traditional sense of a separate, easily accessible box like some vehicles have. The fuses and relays are primarily located in one main underhood fuse/relay center. There might be some individual fuses or relays located near specific components (like near the radio or in the interior fuse panel under the dash), but these aren't considered a "second fuse box."
To find the main fuse and relay center, look under the hood on the driver's side. It's usually a large black plastic box. The owner's manual should have a detailed diagram showing the fuse and relay layout.
