I have a 1975 Big Ben. When I turn the machine on, the target relay engages, the score motor continues to rotate and the 3 B-E-N targets repeatedly try to reset. The manual states..as it should be, that it’s energized by the ‘B’ target through ‘E’ and ‘N’. I have verified continuity or lack thereof through this circuit so all is seemingly correct there. I have had both the main board and playfield on horses meticulously cleaning and verifying that all switch positions are NO or NC as they should be…2x now. Also that there’s no shorts or crosses between any of the tabs on the score motor or anywhere else best I can tell. No other relays are engaged as well that I’ve tried to manually trigger each to see if it altered anything. I have the manual and schematics, but I am novice at best trying to get this thing going.

2 things also worth mentioning:
When this first happened, I tried to hit the start button which in turn engaged the 50 point relay and it got a bit stinky before I pulled the plug and dismantled the machine to clean it. As soon as I smelled something I killed the machine and I didn’t discover which relay stunk until put the playfield on horses.

Also, initially all the playfield lights would remain dim except very briefly between target resets. Now they don’t light up at all.

Any help would be greatly appreciated. I’m truly at a loss at this point.

I’ve honestly checked them more than a dozen times. It takes all 3 targets dropped to complete the circuit. This last time before I posted, I tested continuity from switch to switch to switch to relay and back again.

I almost feel like I’ll have to desolder at this point. This problem was created by me as it was working previously, but hell if I can figure out what I bumped or whatever. Especially after 2x times setting it on horses, re-cleaning and close eyeballs on everything.

So the R-BR is ok. Then I desoldered the BR-B and that is my issue. This feeds the ‘N’ target. But with it pulled from the relay I test continuity with the BLU-W 4 which feeds the ‘B’ target. I only get continuity thru the targets with the ‘E’ switch closed so I know it’s not the path between targets. I see that wire takes path to a marking I don’t understand on the schematics…”C. Ind. B” with a closed switch that is circled??