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Old 03-13-2007, 10:58 PM   #1
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moonlight power supply question

So I have everything I need to put together my moonlights but I don't have a multimeter at the moment. All I need to know is, which wire is positive and which is negative on the power supply. One of the wires is solid black and the other is black with a white stripe. Is there a standard for this type of thing or no? I will have access to multi-meter in about a week and a half so, if need be, I can just wait until then. Otherwise if someone could tell me which wire is positive I would greatly appreciate it.
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Old 03-13-2007, 11:26 PM   #2
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I've always thought that the black with white on it was positive and the black was neg....I could be wrong about that though.....
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Old 03-14-2007, 01:53 AM   #3
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Yep, that's correct.
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Old 03-14-2007, 03:19 AM   #4
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That's what I thought too. I'll just wire one with a resistor like that and see if it lights up. Worst case senario, I'm out one led.
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Old 03-14-2007, 04:40 AM   #5
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Don't forget to post your results with pics as soon as your done.
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Old 03-14-2007, 10:51 AM   #6
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Blk/Wht = +
Blk = -

That has been my experience also. As you said, you can test with a LED. Chances are that you will not ruin the LED, it seems that most of them have PIV rating high enough to handle it, remember that while they emit light they are still just a diode and have to be able to handle some reverse voltage. Just bump the wires together and see if you get light.
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Old 03-14-2007, 06:41 PM   #7
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Sparky, does that mean I need to rewire my hoods? I used to think that black was the hot wire and I wired it to the switch. Do I need to flip it around?
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Old 03-17-2007, 01:02 AM   #8
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If they are working I would say no. The best bet is to check it with a meter though. If you have an LED wired backward, they will just not light. I'd say that you are probably ok
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Old 03-17-2007, 01:49 AM   #9
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Well, my hoods were DIY Compact fluorescent screw-in lights, not LEDs
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Old 03-17-2007, 09:34 AM   #10
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Well I finally got a chance to try it. Striped was positve. Thanks all for the input. I haven't hooked up the whole system yet. I'll probably get working on that tonight.
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