Where can you find the fuse diagram for a 1988 Olds Cutlass?

I have the same car- I'm not sure exactly what you mean by the fuse diagram. The fuse panel is located inside the glove box to the left. Each fuse location is clearly identified for tail lights, wipers, etc. The only one that appears to be missing is the fuse receptacle for the blower fan ( even though it is indicated in writing on the panel). You might have to order a trouble shooting guide for your make or model or just call a dealer's part Dept. and ask them. Good luck.