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Old 05-18-2013, 08:24 PM   #1
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Wiring problem

Ok. So I'll start this by saying, I'm pretty much wiring retarded. So take it easy on me, this may be a seriously stupid question.

Went to install my delta lug nut LED's. Hooked the yellow wire off the pig tail (hot wire) to the white wire from the stock third brake light wiring. Then I connected the black wire from the pig tail (ground wire) to the black wire from the stock wiring. Jumped in and hit the brakes.... And I get a faint blip of light then nothing... I then made sure the pins inside the tub had good connection and still nothing... Highly anti-climactic

So my question is, what am I doing wrong?Thanks for any help.

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Old 05-19-2013, 08:26 AM   #2
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I'd start by testing the lights, just to make sure they're working correctly. Just touch the leads to your battery or another known 12v source.

If that's ok, put a volt meter on the two wires you are using for the hookup. Make sure that you're only getting 12V when you step on the brake, and insure the polarity is correct . . i.e. make sure the wire you think is positive really is.

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Old 05-19-2013, 10:46 AM   #3
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I'd start by testing the lights, just to make sure they're working correctly. Just touch the leads to your battery or another known 12v source.

If that's ok, put a volt meter on the two wires you are using for the hookup. Make sure that you're only getting 12V when you step on the brake, and insure the polarity is correct . . i.e. make sure the wire you think is positive really is.
Thanks for the tip. Looks like I'll finally have to go buy a volt meter.

If I'm not getting 12V at the wires what should I do from there?
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Old 05-19-2013, 11:18 AM   #4
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Pretty sure the black wire on the CHMSL is (+) IIRC

Have you tried switching the wires?
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Old 05-19-2013, 11:26 AM   #5
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Pretty sure the black wire on the CHMSL is (+) IIRC

Have you tried switching the wires?
I had that thought. But I didn't get a chance to switch them yesterday because I had company coming over to my house for some beers. But I will try that as well when I get home. Thanks!
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Old 05-19-2013, 11:57 AM   #6
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Never assume anything. Like assuming white is (+) and black is (-)..
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Old 05-19-2013, 12:04 PM   #7
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Never assume anything. Like assuming white is (+) and black is (-)..
Well, one would think you could assume that the black wire is the ground. But that is a good point. Haha hopefully you're right.
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Old 05-19-2013, 04:48 PM   #8
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Don't test that with the lights. Use the meter. If your polarity is reversed, the meter will deflect below 0 volts.
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Old 05-19-2013, 05:41 PM   #9
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You might want to check fuse #2 in the fuse box behind the glove box if you're not getting power to the high center stop light wires. My Haynes manual says positive is white with tan, and negative is black. I don't have an FSM to compare it with.
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Old 05-19-2013, 07:25 PM   #10
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You might want to check fuse #2 in the fuse box behind the glove box if you're not getting power to the high center stop light wires. My Haynes manual says positive is white with tan, and negative is black. I don't have an FSM to compare it with.
I was guessing earlier, or rather trying to remember. I just checked my '01, and this is correct. White/tan tracer is (+), black is (-)
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Old 05-19-2013, 07:31 PM   #11
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Thanks for the tips. I'll have to check the #2 fuse when I get a chance tonight. Do y'all know what else runs through that fuse or is it just the 3rd brake light?
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Old 05-19-2013, 07:44 PM   #12
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Just had a thought. If the #2 fuse controls all 3 of the brake lights, and if it was blown, wouldn't all 3 not work? My two lower ones work 100% of the time. But my 3rd brake light wiring seems to be acting up. Anymore ideas or thoughts?
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Old 05-19-2013, 08:03 PM   #13
Knows a couple things...

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Never assume anything. Like assuming white is (+) and black is (-)..
Exactly. White is ground and black is hot in many situations like on trailer lights. It sometimes drives me nuts dealing with white ground wires & black hot wires on trailers and some automotive circuits.
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Old 05-19-2013, 08:10 PM   #14
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Exactly. White is ground and black is hot in many situations like on trailer lights. It sometimes drives me nuts dealing with white ground wires & black hot wires on trailers and some automotive circuits.
Yep, for trailer wiring, white is always ground, and black is battery (+) charge wire. LT/yellow, RT/green, tail marker/ brown,, electric brakes/ blue...
Oh, sorry..

Ever worked on a yer-a-peein' car with Lucas wiring?
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Old 05-20-2013, 09:50 AM   #15
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Just had a thought. If the #2 fuse controls all 3 of the brake lights, and if it was blown, wouldn't all 3 not work? My two lower ones work 100% of the time. But my 3rd brake light wiring seems to be acting up. Anymore ideas or thoughts?
Yes, the one fuse is used for all the brake lights, so if the others are working, the fuse is okay. Remember though, the center brake light does not use the same wires as the other two. The two outside lights come from the turn signal switch, and the center light comes from a connector between the brake light switch and the turnsignal switch.
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Old 05-20-2013, 10:48 AM   #16
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Yes, the one fuse is used for all the brake lights, so if the others are working, the fuse is okay. Remember though, the center brake light does not use the same wires as the other two. The two outside lights come from the turn signal switch, and the center light comes from a connector between the brake light switch and the turnsignal switch.
Gotcha. Thanks!

So far I've just tried connecting the pig tail to the stock wires. But I'm about to go seek some help from a friends uncle. I'm just not cut out to be an electrician. But is there anything I'm obviously doing wrong? I've made sure the pins have good connection. Made sure there was plenty of wire in the connectors so they'd be touching. Should I just ground the wire to the tailgate instead of through the stock wiring? (As in ground it on one of the screws that hold the little bracket down?)
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Old 05-20-2013, 01:15 PM   #17
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Just as an update for anyone else still reading this, I got them to work! Turns out on my jeep (a 2.5L '98) the jeep's black wire connected to the yellow wire on the pig tail and the jeep's white wire connected to the black wire from the pig tail. Looks like Patrick H was right about never assuming things
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Old 05-20-2013, 02:28 PM   #18
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Just as an update for anyone else still reading this, I got them to work! Turns out on my jeep (a 2.5L '98) the jeep's black wire connected to the yellow wire on the pig tail and the jeep's white wire connected to the black wire from the pig tail. Looks like Patrick H was right about never assuming things
Good job...! I was just about to ask if the tail gate was shut...
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Old 05-20-2013, 06:12 PM   #19
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Good job...! I was just about to ask if the tail gate was shut...
Haha I wouldn't put it past myself to do that. Like I said, I'm an electrically challenged individual. But for my 2nd wiring job ever, turned out pretty well. And I'm pretty satisfied with the outcome. These things are bright!!
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Old 05-20-2013, 06:24 PM   #20
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Haha I wouldn't put it past myself to do that. Like I said, I'm an electrically challenged individual. But for my 2nd wiring job ever, turned out pretty well. And I'm pretty satisfied with the outcome. These things are bright!!
LED's are great. I just put them in some existing can lights in our dining room....wow! And they're supposed to last 35 years. The next owner will have to deal with 'em..
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Old 05-20-2013, 09:29 PM   #21
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If you do a lot of 'off roading, ' it would be a good idea to purchase a 12V test light. they are cheap and come in handy in place of a voltimeter.

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