Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
Tackling that fuse box on your Impala sounds like quite the project!
As for your question about the plastic guides for the wiring connector bolts, these usually help secure the wiring connectors but aren’t typically the main thing holding the fuse box case together. Most of the time, the fuse box case is held together by hidden clips or small screws along the edges.
Here's a tip: Gently pry along the seams with a flathead screwdriver or a plastic trim tool. Be careful and go slow, checking for hidden clips as you go. The last thing you want is to break a clip and have the whole thing snap back together like a clam. Once you get it open, you’ll have access to those buried relays.
If you’re not feeling confident or things get tricky, you might consider reaching out to an automotive electrician. They often have the tools and expertise to tackle such detailed work.
If you need more advice, have other questions, or need to find a certified repair shop in your area, just let me know! Call us at 877-913-1554, and we'll gladly find you a certified RepairPal shop in your area!
