Grumman appears to have been bought out. Here's the URL for the company that bought them. If you contact them, they should have the old literature on your pontoon.<br /><br />Be nice. Write them a good email, and ask politely for what you want. You'll probably get it.<br /><br /> http://www.marathonboat.com/Originally posted by nooby:<br /> Hi, <br />I was wondering if anyone knows where i can get a wiring diagram for this boat?<br /><br />thanks!