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LED GPR Hookup help

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Old Mar 10, 2008 | 06:14 PM
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Exclamation LED GPR Hookup help

I have a '01 PSD F-250. Last weekend I found the post on here about hooking up a LED to the GPR. I got the LED and inline fuse from Radio Shack and began to hook it up. I ran the wire from the correct place on the GPR and into the cab grounded out the LED and when I turned the key on the LED didnt light up. So i figured my GPR was bad but it was reading equally on both sides, i hooked up a trailer light i had laying around and it worked. I bought another LED and same thing happened wont light up. When i put the LEDs on a small battery they light up but not when connected to my GPR. Does anyone know why i cant get the LED to work?
 
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Old Mar 10, 2008 | 06:17 PM
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how warm is it where you are right now???
 
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Old Mar 10, 2008 | 06:18 PM
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also if you have ran your truck recently and try to start it..as long as the engine is still warm it wont come on...my comes on when i start it up after it has been sittin for awhile otherwise when your GPR is energized it wont come on
 
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Old Mar 10, 2008 | 06:21 PM
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its in the low 30s but when i initially tried it the truck had not been running in a couple days and it sat in 30* temp.
 
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Old Mar 10, 2008 | 06:22 PM
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i just couldn't figure out why the trailer light would light up and the LED wouldn't...
 
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Old Mar 10, 2008 | 06:24 PM
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hmm well you got me there the only thing i can think of is that your right and need a new GPR
 
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Old Mar 10, 2008 | 06:41 PM
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thanks for your help...
 
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Old Mar 10, 2008 | 06:41 PM
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Make sure the black lead from the LED is going to a good ground.
 
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Old Mar 10, 2008 | 06:45 PM
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i have it grounded out to the framing on the dash
 
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Old Mar 10, 2008 | 06:47 PM
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yep.Its gotta be that you dont have a good ground on one of the led wires.one wire to gpr,one wire to ground.
 
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Old Mar 10, 2008 | 06:47 PM
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srry slow type
 
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Old Mar 10, 2008 | 06:48 PM
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you do have a fuse in the holder rite?
 
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Old Mar 10, 2008 | 06:51 PM
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LED's only allow current flow in one direction, maybe you should swap the leads on the LED
 
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Old Mar 10, 2008 | 06:59 PM
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but he said that it lights up on his trailer light and it worked
 
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Old Mar 10, 2008 | 07:00 PM
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Appreciate the help....
 
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