Below is a picture of the original wiring on a typical Funhouse machine.  The haphazard wire routing makes it difficult to work on the game.  Additionally, there's always the risk of snagging a wire and ripping it loose.

 
Below are pictures of the reworked switch harness installed.  It really cleans up the underside of the playfield!  There are still two harnesses to do, but these results are very encouraging.
Click a picture to see an enlargement...