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Why LEDs not working on trailer?
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Why LEDs not working on trailer? - June 8, 2013, 03:47 PM

I picked up a bunch of LED lights from Restless Wheels for my trailer today; popped them in and some worked while most didn't. The brake lights and the running lights on the fenders worked fine, but every light on the body did not work. I tried reversing how I inserted them and that did nothing. I replaced one with the old incandescent light and it worked fine.

I'm going to take the trailer over there Monday so they can play with it; worst case I just put incandescents on but figured I'd post up here just to see if anyone has any ideas. Thanks.


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June 8, 2013, 03:53 PM

First thing that comes to mind is polarity. Unlike filiment bulbs, LEDs will not work with polarity reversed.


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June 8, 2013, 03:59 PM

Bad ground, trailers rust quick.
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June 8, 2013, 04:04 PM

Quote:
Originally Posted by windblown View Post
First thing that comes to mind is polarity. Unlike filiment bulbs, LEDs will not work with polarity reversed.
I wondered about this; thought maybe I had all of them in backward; tried reversing one of them but it still didn't work.

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Bad ground, trailers rust quick.
I must not understand something. Why would that impact the LEDs and not the incandescents?


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June 8, 2013, 04:10 PM

I would say probably need to get resistors. I have these and they work awesome.



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June 8, 2013, 04:29 PM

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I would say probably need to get resistors. I have these and they work awesome.

If the lights he picked up aren't designed for 12 volts then resistors would be a great investment! But even if they are lower voltage LEDS without internal resistors they should still light up.


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June 8, 2013, 04:31 PM

I guess the first question really should be: Do the new LEDS work if you connect them to a 12V source?


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June 8, 2013, 04:43 PM

And just like that you and bds120 have exceeded my knowledge. I know nothing about resistors but am happy to test if a 12v will power them, if you explain how to do that and I have the right stuff.

FWIW, the guy at the shop looked at my trailer and picked out the lights. I called him and he is puzzled; will check out Monday if not solved before.


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June 8, 2013, 05:35 PM

Can you snag a picture of the bulb off the net? A model number would be helpful too.

As far as testing it's just a matter of taking a couple of jumper wires from a 12V source and connecting the bulb. If it it has a round metal base touch the ground wire to the side of the metal base and the +12v power wire to the shiny metal button on the bottom of the bulb.


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Re: Why LEDs not working on trailer?
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Re: Why LEDs not working on trailer? - June 8, 2013, 08:03 PM

Quote:
Originally Posted by RADAR Magnet View Post
And just like that you and bds120 have exceeded my knowledge. I know nothing about resistors but am happy to test if a 12v will power them, if you explain how to do that and I have the right stuff.

FWIW, the guy at the shop looked at my trailer and picked out the lights. I called him and he is puzzled; will check out Monday if not solved before.
Basically what I'm saying it all you do is place those resistors between the connectors. Like I use bullet connectors and put them on the ends of the resistors. You basically just put them between the connections. Very simple.


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June 9, 2013, 07:52 AM

Quote:
Originally Posted by windblown View Post
Can you snag a picture of the bulb off the net? A model number would be helpful too.

As far as testing it's just a matter of taking a couple of jumper wires from a 12V source and connecting the bulb. If it it has a round metal base touch the ground wire to the side of the metal base and the +12v power wire to the shiny metal button on the bottom of the bulb.
+1 to pictures.
You can use a 9 volt battery to test them. Makes it easier than using your car battery. Ignore the resistor in the photo, your lights will have an internal resistor. Because an LED is a diode, polarity is important so try connecting both ways. I have found LED's that were reversed from what was marked. Fucking Chinese shit.


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