kris319
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This is a bit different than what ya'll are use to but I'm about ready to take a blow torch to these things. I'm by no means extremely knowledgeable in electrical so I'd really appreciate you guys help in figuring this out. I glued and wired THESE leds into my hood scoops in my truck. Below are pictures showing how it was all done. The scoops are wired to a switch in the cab and the battery, their is also a fuse and a relay. My issue is that I keep losing leds and I have no idea why. Below are some pictures of how it was all done. Any and all suggestions are welcome. Glued using 3m weatherstrip adhesive  Good before and after example  To make it easy I soldered them in 3 groups of 6 and a group of 7  The 4 groups soldered together  Connected under the hood with disconnects. The disconnects are wired to a relay, a fuse, and a switch in the cab.  Here is what it looks like 
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trabe3
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Re: Need help from some of you electrical gurus!
2014/08/01 14:06:08
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The link you had showed LEDs that are for 24V application? Is that what you have? I'm sure you truck is only 12V though. But lower voltage really shouldn't harm them, it would just not light up as bright. Any idea what amperage they are rated for? I don't see it mentioned in the listing. I see it mentions "current-limiting resistors" but not sure how much it limits it to. What amp fuse are you using?
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ty_ger07
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Re: Need help from some of you electrical gurus!
2014/08/01 14:07:04
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Are the LEDs designed for 13.5-14.5 volts?
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kris319
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Re: Need help from some of you electrical gurus!
2014/08/01 14:10:37
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trabe3
The link you had showed LEDs that are for 24V application? Is that what you have? I'm sure you truck is only 12V though. But lower voltage really shouldn't harm them, it would just not light up as bright. Any idea what amperage they are rated for? I don't see it mentioned in the listing. I see it mentions "current-limiting resistors" but not sure how much it limits it to. What amp fuse are you using?
ty_ger07
Are the LEDs designed for 13.5-14.5 volts?
I originally had some rated for 12v but since with the alternator it can go up to almost 15v I figured that might have been the issue and I switched to the 24v ones. I figured they should still work but just wouldn't be as bright as they would with a 24v source.
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amtek
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Re: Need help from some of you electrical gurus!
2014/08/01 14:17:36
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The link says those are 24 volt LED's, I'm guessing you got the 12v kind. How do you keep loosing them? do they appear burnt in any way? Do they get dim or flicker? I really doubt its a cold-solder issue but you could try stripping one of the dead ones and re-soldering them to see if it works again, Otherwise there may be too much voltage reaching the LED. If connected directly to the battery you could be getting up to 14-16 volts. You could try soldering a 1-watt 8 ohm resistor on the positive side to drop the voltage a tiny bit and see if they last longer. Split up that group of 4 and use 1 resistor per 2 groups.
8 ohms at 12v should drop it down to around 10v
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kris319
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Re: Need help from some of you electrical gurus!
2014/08/01 15:22:41
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amtek
The link says those are 24 volt LED's, I'm guessing you got the 12v kind. How do you keep loosing them? do they appear burnt in any way? Do they get dim or flicker? I really doubt its a cold-solder issue but you could try stripping one of the dead ones and re-soldering them to see if it works again, Otherwise there may be too much voltage reaching the LED. If connected directly to the battery you could be getting up to 14-16 volts. You could try soldering a 1-watt 8 ohm resistor on the positive side to drop the voltage a tiny bit and see if they last longer. Split up that group of 4 and use 1 resistor per 2 groups.
8 ohms at 12v should drop it down to around 10v
I have the 24v ones at the moment do to the reason I mentioned in my prior post. I've noticed a few flicker a bit and then go out. I didn't check to see if they were burnt but I think I would have noticed that. I think my issue might be the ground. One of the grounds was grounded to the neg battery terminal, I relocated it to a ground point that I had created for my HID harness and 1 of the 3 leds that were out came on. I removed one of the other 2 leds and another came on so apparently that one was causing some kind of short. I replaced that led and put everything back. It's all working for now (fingers crossed). 
post edited by kris319 - 2014/08/01 23:11:40
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Nozler
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Re: Need help from some of you electrical gurus!
2014/08/01 22:47:17
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Where was the first registration?
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kris319
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Re: Need help from some of you electrical gurus!
2014/08/01 23:09:59
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Nozler
Where was the first registration?
I'm sorry but I'm not sure what it is you're asking.
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Bruno747
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Re: Need help from some of you electrical gurus!
2014/08/02 09:33:44
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Edit: looking at your link my gut tells me that the shrink wrap they come with is getting moisture between the wires in the led. Does you truck stay in a gararge or has it rained recently? Second Edit, I just opened this on the computer and noticed the water on the hood. I refer to the remark above. Did the led come with leads attached or just the bare wires. Sounds to me like water shorting the individual wires on the led from the factory before you put leads on them. If any of them go out again take some canned air to the back of the led. if this ends up being the case, take that shrink wrap off and get some liquid electrical tape to seal them with. A few coatings on each led should do.
post edited by Bruno747 - 2014/08/02 19:04:34
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DMIINC
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Re: Need help from some of you electrical gurus!
2014/08/03 05:48:05
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Quality of LED? Vibration might play a roll in it too.
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kris319
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Re: Need help from some of you electrical gurus!
2014/08/03 11:01:48
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Bruno747
Edit: looking at your link my gut tells me that the shrink wrap they come with is getting moisture between the wires in the led. Does you truck stay in a gararge or has it rained recently?
Second Edit, I just opened this on the computer and noticed the water on the hood. I refer to the remark above.
Did the led come with leads attached or just the bare wires. Sounds to me like water shorting the individual wires on the led from the factory before you put leads on them. If any of them go out again take some canned air to the back of the led.
if this ends up being the case, take that shrink wrap off and get some liquid electrical tape to seal them with. A few coatings on each led should do.
It has leads and the wires are attached to the leads. I made sure to cover the gap between the heat shrink and led with the 3m weatherstrip adhesive that I used so it wouldn't get water. I live in south Florida so rain is definitely an issue. Since I moved the ground off the battery, I haven't lost any more leds. Is it possible the ground on the battery is sending some kind of current that it shouldn't be? DMIINC
Quality of LED? Vibration might play a roll in it too.
I was thinking vibration could be an issue since they are right over the engine. If I keep having issues, it's definitely something to consider.
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Bruno747
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Re: Need help from some of you electrical gurus!
2014/08/03 13:30:07
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I was gonna ask where you were at but I see Miami, close but still 2hrs away.
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