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RE: MS-100.RECENTLY PURCHASED A 1990 BOAT WITH THE FOLLOWING MANUALS: MS-100 MAGTRONIC HEADING SENSOR NAVIGATOR 2000 RITCHIE MAGTRONIC (electronic compass and heading system). Questions: 1.Are all the above related, i.e., all interface to create a complete ''Heading System''? 2. Recently replaced the boat engines and the digital display MD-100 flickers on and off. (May be related to number 3 below.) 3. Noticed that the black wire is not attached to anything. Per the internet site, it is called a ''GROUND''. Question: what is it grounded to?? I am in the process of gathering all the available instructions and see if it still usable. Any comments, suggestions, etc. will be greatly appreciated. William

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Instructions should be in the manual found here

They sound like they are for your from usb posts on case...but thats just a gues :)

Hope that sorts it for you?

Posted on Dec 30, 2007


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im not sure on your motor but if you have a choke tube with a cylinder in it the cylinder could have came out take the top off and hit your choke and see what moves

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