Trevor has good points, but...
Trevor is right on, but the problems he raises aren't reasons to reject the boat, just good reasons for a lower price, particularly if you are a do-it-yourselfer. The exception would be an extremely bad case of blisters involving hull delamination, etc. I've dealt with the first three items myself and any boat of that age has had the issues and been repaired or upgraded or will need to have the repairs done at some point in the near future. As I recall, the wiring harness is in the range of $100 or so for the upgraded harness, a new fuel tank is under $300 (about $75 if repairable) and the exhaust elbow varies from under $100 (the pipe is cheap, the high-tech insulating wrap is expensive) if you make your own from black iron pipe to something between $100-$200 if you buy a new stainless steel one from Catalina. Note that you'll find info on all of these repairs on this site if you search the archives. These are all do-it-yourself costs. If you're bargining down a selling price, you want to use what a boatyard would charge, so get some estimates. Blister repairs can go from almost nothing to thousands of dollars, so that would be my main concern.
