I recently bought my '94 27 Fever and according to the casting stamp on the engine it has a '96 Gen VI 502 which is supposed to MPI, but it has a Holly 4150 on it. It looks like an OEM ignition, but to satisfy my own curiosity I would like to know which ingnition system it has on it. Is there some visual method to I.D. which mercruiser ignition system I have? If not, what the best way to find out?
Any help is appreciated.

This is a TB IV ignition. If the module looks like part #7 then thats what it is.
http://www.mercruiserparts.com/Show_...L+AND+IGNITION

should read thunderbolt on the module,,then read the numbers on it one set of numbers should start out as v8?? let us know what the last two digits are.