I bought my grandson a 94 Nissan p/u for his first vehicle. We've had the same problem with the truck not starting. While we were waiting on him to get his license, the truck was parked and a pack rat got into it and chewed some wires. We took it to a mechanic and he put some fuses in the wires that are attached to the battery cables. At times, the right fuse blows and once replaced it starts. We've taken the battery out and had it checked and it's fine. But when we put the battery back in--loosing tightening the cables and it starts right up. You can jump the battery and it starts right up, but won't run long. The p/u acts like the battery is dead.
Any ideas??
Thanks,