both pumps are located under the rear deck panel next to there respective seacocks. To replace them will involve unscrewing and pulling up the panel then re-caulking it. If you really hate yourself you can try swapping them out through the small access hole provided, but good luck. The fuse panel is located under the dash panel on the starboard side where the Yamaha gauges are. There should be separate fuses for each pump. I find I get about 2 years out of each pump before I have to replace them. Access to them is a real pita. there is another member on here who has put a hinge and gasket on the rear deck panel to make access easier. Hope this helps. you can also download the owners manual from the Grady site which has some more info including plumbing and wiring diagrams.