Originally Posted by sea_hunter
Yes automotive serpentine belts require a loaded tensioner, the ones used on marine engines employing large case alternators do not. The belt goes around ALL the drive pulleys, but underneath the idler pulley. The tension is loaded with the alternator adjusting arm. The main reason it's done this way is that marine diesel engines don't operate at variable and higher engine RPMs (therefore no backlash that causes the belt to "jump") like automotive engines. Hope that helps.
Thanks - good to know.
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I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.