i just installed a msd blaster coil 2 to my 1990 240 coupe before i installed it it turned on fine, but now when i turn the key all i get is a clicking noise from the starter

i also have a blown 75a alternator fuse can that be the problem?

need the help thanks!!

 

Did you disconnect the battery prior to installing it?

If not you probably shorted something. I'd double check all the connections you touched, replace the fuse and try again.