Well, I have worked on my non-working machine for the last two days and I think I have one problem to solve before all is right with the world. My GI lighting and some of the backbox lighting are not working.
I checked all the bulbs but there seems to be no power going to the yellow/yellow & white wires going to the backbox. I looked at the connectors on the board and the molex connector and pins look good. Any other ideas for a novice such as myself?

If I have no power going to the GI lights could it be a power supply issue? Are there any GI fuses hidden somewhere that I am unaware of? It doesn't look like the yellow/yellow & white wires that handle power go to the board. It looks like they head straight to the backbox and the playfield.

Sorry guys, it's a Williams Flash machine that I bought last week.

Is the GI plug on the transformer outside of the black "caution high voltage" box or inside it somewhere.

I just metered the yellow wire for GI lights and it seems to be reading 0.01 v AC. Is the transformer bad?

Checked fuses that I can find and they all tested good. I cannot find any inline fuse for the AC heading from the power supply for GI. Is there a hidden fuse under the playfield that I possibly missed?

It looks like the yellow wire that comes off the transformer heads straight to another group of wires that have been soldered together and those run to the lights. I tested power from that wire junction to the ground and get the 0.01 v AC. I will hunt some more for a missed fuse...

I just realized after reading more threads that I was not reading the AC properly. Where would I need to catch the common for the AC to properly meter it? (I was checking it at the DC grounding point)

I appreciate all the ideas from you guys. I just wish I wasn't such a novice at this. I guess we learn by doing...

Going to pull out an old motherboard and practice my soldering...

To all of you that responded by saying "check the fuses", you win!. I visually inspected all the fuses and checked out all but one on the meter. It was the final fuse that was bad but showed no signs of being blown. Now that I fixed that, it looks like somebody removed a bad bumper switch and never replaced it. Guess I need to order that and possibly some blue leds to brighten up the GI lights.

Again thanks...from a noob...

Anybody here have any idea where I can find the the part number? I presume the proper term would be a "sling bumper leaf switch"? There seems to be no mention of an actual part number in the Flash manual.

I called some online suppliers like Marco, Pinball Life, Action, and Lakeside but I they all seem to be out of stock.

You guys are awesome!!!!