I didn't think No Fear had a ball accelerator. Are you thinking of Getaway instead?

Google to the rescue!

Basically you just put it into test mode, throw a ball up the ramp and it should detect and then accelerate the ball.

Check page 1-16 of the manual and the top of page 1-17 (for specific button commands)

http://www.arcade-museum.com/manuals-pinball/N/No_Fear_OPS.pdf

Were the old magnets working before you replaced them? In a properly working NF, anytime a ball makes it to the first opto, the first magnet should be energized, similarly, as the ball passes the second and third optos, those corresponding magnets should energize to pull the ball up the ramp. You ran the switch test to make sure the Optos are working but the magnets don't energize in the magnet test? You can also test each magnet individually. I am assuming you correctly hooked the wires of the magnets up correctly? How about a blown fuse? Melted ramps are caused by the magnets overheating and or locking on, a common problem with NF, especially in the original game software. The newer software corrected the problem. I would also check the board for possibly bad driver transistors.

Are the magnets hacked in any way on the driver board side? Are these driven also by transistors? Are the driving transistors good?

Pretty unfamiliar myself just talking out loud hoping to come up with something.

the ramp has to be lit for the magnets to work. if it is not the ball is denied and sent back. so make sure this feature is lit to make ball accelerate . once again... ball does not always accelerate , ramp has to be lit.

I think this will show you your problem. Likely culprit if old magnets looked like crap.

Did you replace any fuses since you got it? Or maybe they replaced them before splicing magnets the first time.

Been there, done that. Glad you got your NF working. I am going to tear down my game over the winter. I like it alot. It's my wife and daughter-in-law's favorite game that i have.