DEFINITELY determine if it's the Camshaft Synchro--aka the link which DRIVES THE OIL PUMP! An engine killer!
Just remove the serpentine belt entirely. It will not harm your Vulcan--esp. if cold--to run for 60 seconds or less w/out the belt. This will also remove all of the fan/alternator/water pump/AC clutch noise, and make the dying cam synchronizer stand out even more--if that is the problem.
RE: PULLEY ALIGNMENT(S), if you don't have access to a LASER, a metal yardstick is good enough.
Hat tip to McCormack @ TRS for pointing out that the tensioner design is a bit lame from the get-go, and persistent squealing is often due to the tensioner getting just slightly out of true with the crankshaft pulley... again, the EDGE OF A METAL YARDSTICK tells the tale...
... if your tensioner IS out-of-aligment (even if new), you can shim it back to true by removing tensioner and re-installing w/ very thin washers on the alignment stud... on my to-do list.
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1999 Ranger XL Sport 4x4 (PVHubs, lol), 2-dr. "Supa" Cab, Vulcan(FLEX-fuel)+M5OD, LSDiff(7.5)... Aluminum "GT Racing" hood (lol), rubber flooring, hand-crank windows... bone stock, but gettin' ready to add some "thaaangs"...