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Quoted from charles4400:The only thing throwing me off now is that I see a blue wire coming from the bottom left and a brown one coming from the bottom right. I thought blue was neutral and brown was hot?
Or do those bottom wires have nothing to do with the top ones?
Just for removing doubts about what they do.
Stab a meter probe in one of those wire caps and the other probe to the ground, set to volts test repeat for other cap to compare.
Result?
Quoted from charles4400:The only thing throwing me off now is that I see a blue wire coming from the bottom left and a brown one coming from the bottom right. I thought blue was neutral and brown was hot?
Or do those bottom wires have nothing to do with the top ones?
What I was saying before was that if you had power( before you cut the plug off) and you test probed the blue wire to ground then the brown wire to ground you would see which one had the feed (hot) & return (neutral) because it sounded like you wanted to know which was hot and which was neutral after that emi box.
I believe that the new cord has to be installed the same as the previous old one hot to left and neutral to the right as seen on the photo you posted.
Another good safety feature to use is a GFCI outlet.(protects against shocks)
One other thing on hot & neutral in relation to a 3 prong receptacle or plug is looking at it head on it looks like a smiley face.
The small vertical slot(r/s) is hot (feed)the longer vertical slot(l/s) is the neutral (return)plus if you look at the screw terminals (on most receptacles or plugs) you would usually see a gold colored screw (hot )and a silver colored screw (neutral).
Its just standard for wiring.(safety reasons)
Like LTG said its a good idea to check your wiring anyway.
Quoted from LTG:Get an outlet checker. Handy for checking wall outlets to see if hot/common/ground are wired right and working.
And you can plug into the service outlet on your game and that will tell you if your game is wired right.
LTG : )
Quoted from charles4400:I have many pins but I still have alot to learn about electricity (obviously!) .
Here you go.
More info>>http://bellevuecollege.edu/distance/cs110rh/it217/week02/21_electricity.htm
Good luck.
Quoted from MrArt2u:Does anyone have a source for these 3 prong extension cords in bulk? I'm hoping to change out all the cords on my EMs and SSs to 15 foot long grounded cords and I would need about 50 of them. I keep hearing the dollar store has cords but I've only ever found two prong.
Thanks,
Art.
If you dont mind orange indoor /outdoor extension cords Walmart 100 foot $16.77 ea. Ge 3 prong plugs W-m $1.97 ea. cut to 15 feet long (only 6.66 cords from 15`)=$2.51 ea + $1.97= *$4.48 ea. all w/o tax of course 
Math it out for the total cost 
At 10 feet is a better deal $1.67 ea +$1.97=$3.64 ea
Not to shabby 
You can also buy cord in bulk at the box stores too just need the plugs.
*Update: A can of black spray paint W/M brand painting the orange jacket will work (around $1)
Quoted from mg81:I don't think you will find any UL listed 3 prong extension cord available in the US that is not a large enough gauge to safely run a pinball machine. The bigger pain is finding ones that are not bright orange.
I agree but I can do 10 /10 foot long cords w/ends for under $38
Quoted from mg81:The bigger pain is finding ones that are not bright orange.
Black rattle can 
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Sunbury, PA