I would not recommend using Haynes or Chilton for 3rd gens. Not only do they cover a range of generations and models, but I've read that there are errors in some of their torque specs. Not to be trusted.
I but the bullet and bought a factory service manual. They come up on ebay from time to time and are reasonably priced. I've read that you can buy them from Helms also.
For the clutch and rear seal job, you can use the online factory service manual in this link...
Honda Shop Manuals - 1988 Prelude
It's mainly for the 88 model, but the information will be the same for yours. Plus there are supplements for 89 and 90. This may not help you much for your electrical problem because a lot of that section seems to be missing from that link.
Finally, you should also check out
www.Prelude3G.com for everything 3rd gen Prelude related. Good luck and welcome to your new addiction.