Coin door light wiring help

Firepro4life52

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So I am trying to wire up some 12v coin door lights to the power supply of my 60-in-1 nd I am having a little trouble. I bought this harness from the link below rather than make my own and connected it to the power supply, but for some reason the bulbs won't light. I tried connecting various connection combinations of the power and ground and got one bulb to light, so I know it's receiving power, but I can't seem to get both to light. The harness has 14 connectors...are there are particular ones I should be connecting to the bulbs? I didnt think it mattered if all 14 are not used, but what do i know. Sorry if this is a noobish question and any help is greatly appreciated.

http://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=66&products_id=385
 
Check the 12v and ground lines for continuity with your multimeter. If nothing else, you could just run new lines up from your switcher.
 
Hmmm...guess it doesn't help that I don't have a multimeter. Again I did get one bulb to light, but it seems like if I dint have the combination of connectors connected, it doesn't work. I assumed it would just be plug n play.
 
I can't quite tell what's going on, so I'll just explain how it works.

Power supply has a ground, and has a 12 volt connection. If the ground goes to one side of the lightbulb, and the 12 volt goes to the other side of the lightbulb, it lights up.

So, any of this could be your problem

1. Harness wasn't made right... if something's not crimped right, it's not actually connected so you're not really connected to the power supply
2. Bulb is bad
3. bulb holder is bad (isn't connecting to the bulb properly)
4. power supply is bad (12 volt isn't working or is working intermittently)
5. You're using leds, and the wires are on the wrong side (some leds need the ground on 1 specific side)

It's got to be one of those 5, it's literally the simplest possible circuit to make.
 
Yeah, I'm no electrical engineer, but I realize it is a very simple circuit. Turns out I just had to switch the 12v and ground connectors on each lamp, as they are indeed LEDs. Wouldn't have killed them to label the lamps as such. Anyway, thanks for the help!
 
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