I have an IJ Williams and I've been having the same issue. Lower back box lights are all out. I just replaced my Power Driver board last week with a brand spanking new Rottendog Power Driver board and the same issue still exists. Obviously the board is perfect and the connector appears to be good too.

Now I'm thinking there must be a short in the wires that lead to the lower back box lights from the Power Driver board. I'm gonna move some pins around on the connector to check and see if I can get the lower lights to operate. If that doesn't work then I'm going to rewire the lower back box lights.

I thought the new board would have fixed this but I was wrong.

QSS

Will get on that this weekend. Dragging my meter out and doing 2 minutes of diagnostics really cuts into my "lazy ass" time.

QSS

Ok LLoyd, I took your advice. Please read below regarding my situation and maybe it will help the original poster as well.

I have an Indiana Jones Williams. I just replace the original Power Driver Board as well as the Fliptronics Board with New Rotten Dog Boards.

With the new Rottendog Power Drive Board everything works on the game except the lower back box lights. Strange thing is, on my old original Power Driver board the lower back box lights also did not work.

Here's what I have done to try and locate the issue:
- I have confirm the lower backbox string of lights is working via a 9 volt battery test. All lights light up so we know it's not an issue with the string of lights.
- I have confirmed that there is power coming in through J115 at the #5 pin and the #10 pin. I have metered the back of the J115 connector as well as on the front of the J115 connector and I have power on both the front and rear of the connector.
- I have confirmed the F107 fuse is good which feeds the J120-5 and J120-10 pins.

There is no power coming from J120-5 and J120-10 (Green String). There is power to all other strings on J120 and J121. The Yellow, Orange, Brown and Violet strings all have power and all strings work as expected.

The only thing I can think of is there is an issue with the Q16 on the new Rottendog Board. How do I actually test Q16 to see it the problem is truely there?

What I find very odd is that the same issue existed on my old original board. How could you have the same issue on two boards made 25 years apart?

Could there be an issue with the power coming off the transformer somehow overloading only Q16 and causing it to fail or is this just a case of unusual coincidence?

Any additional help would be appreciated. Thanks.

QSS

The problem has to be one of the connector pins in the J115 harness right?

QSS

I did take a break at 10:00 pm last night. It was a long afternoon trying to figure out what I thought was something so simple.

Anyway, I am confident that it is the J115 harness causing the issue so I'm gonna order a new connector and pins for J115 and redo it and see what happens.

Here's hoping.

QSS