Good Day, I picked up a Williams Space Mission for about 800 bucks plus s/h a few weeks or so ago. It was one of two of my favorite machines (the other is Bally Aladdin's Castle which I'm restoring). The backglass is a "10" with the normal areas of wear on the playfield however it's still clean and the clear coat is very nice. I haven't fired it up yet since I noticed that the power cord is very old and appears to be a lamp cord (2 prong). I've got one on order but noticed that the power cord is pigtailed to 2 wires....yellow and brown. Schematics show the yellow wire which transitions to red to the transformer, however the other wire should be black. Also, found that there is a capped off green wire which doesn't make sense in the schematics. Wondering if anyone else has seen this, and if the green wire is ground. I'm not electrical savvy and my schematic reading skills are minimum....just want to know if anyone else has seen this? Thanks!

Thanks, I'll have a look!

I read Vid's guides which emphasized cord replacement and safety precautions....good stuff but not answering my question. It looks like someone spliced and pigtailed in a 2 prong lamp cord. From what I can see, there is a brown wire pigtailed to the power cord which I believe is going to the transformer....the other spliced wire I'm having trouble tracing since it bundled tightly in the wiring harness. Lastly, in the same area is a green...which is capped off and I believe is grounded to the transformer. I'm just having a heck of a time verifying the yellow wire....and the schematic isn't helping....any ideas? Thanks.

Will check....unfortunately I have to cut through the waxy wire ties to trace the hot and neutral. Thanks

The cord was pretty bad, didn't want to plug it in and use a meter. I was able to trace the wires....yes yellow went to fuse, brown to transformer and green ground...added a new cord and fired it up. Credits were set to 17 and I was able to play 1 game, however after game over....that was it. Credits still remained....now trying to identify the credit zero switch which should be in closed position...can't ID it. I read pinrepair which showed a pic of a Bally and Gottlieb zero switch, but not a Williams. Everything else appears to be in good working condition. Machine hadn't been fired up in 10 years I was told, but was working when it was put into storage.

I found the credit zero switch...it was definitely open....I closed the switch manually and it fired up again...will take care of that issue. Otherwise...a few adjustments to scoring need to be made and a good cleaning of components and I think it'll be good. Thanks!