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jims992500
Novice
Jun 7, 2014, 4:48 PM
Post #1 of 17
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Tail Light issues
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I have a 99 silverado 2500 that im having a brake/tail/license lamp issue. I have turn signals and reverse lights but thats it, no tail, brake, third brake or license lights. I have all the correct wires hooked up, yellow to yellow, dark green to dark green, white to white, brown to brown, light green to light green. in the loom from the front of the truck, in addition to the wires ive already mentioned, i also have a large blue wire, a large red or orange wire and a small blue wire. in the loom from the back of the truck(under the very back of the bed) i have the three wires required for tail and running lights(dark green, yellow and brown) the light green for the reverse lights and the brown for the tail lights. in s separate little offshoot there is a large black wire and an even larger white wire. connecting the white wire from the front loom to the white and black wires from the other loom gave me what lights i have. I still have the other three wires from the front loom that are still open so i dont know if not having these wires hooked up is causing me to not have tail/brake/license lights.
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Hammer Time
Ultimate Carjunky
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Jun 8, 2014, 1:02 AM
Post #2 of 17
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Re: Tail Light issues
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Hooked up to what? What is it you are trying to do?
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jims992500
Novice
Jun 8, 2014, 4:15 AM
Post #3 of 17
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Re: Tail Light issues
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All of the wires that I know of that are supposed to be hooked up to each other are connected. (Dk Grn to Dk Grn, Wh to Wh, Yw to Yw, Br to Br) I took the bed off the truck to replace the fuel pump. I don't have the junction block in the back of the truck like I have seen in so many threads to make life easier, it's just looms, so I had to cut wires in order to remove the bed. Whoever had the truck before me had a 7 pin trailer plug on it but half the wires were cut off and attached here and there(it was a mess!!). I tried hooking it all back together the way they had it, minus the 7 pin and I had absolutely nothing, I did some checking in the loom coming from the front of the truck and found my brown and white wires which is when I also found the two blue wires and the red wire.
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Hammer Time
Ultimate Carjunky
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Jun 8, 2014, 5:06 AM
Post #4 of 17
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Re: Tail Light issues
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This is not a real simple circuit. They use a number of bussing blocks to splice circuits together for both power and ground.
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jims992500
Novice
Jun 8, 2014, 5:56 AM
Post #5 of 17
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Re: Tail Light issues
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So if I'm reading this correctly, the small blue wire coming out of the loom from the front of the truck(it's not lt. Blu so I assume someone replaced it.) needs to be connected to the brown wire coming out of the back of the truck? That should give me my tail lights? If that is the case, what is the brown wire from the front of the truck connect to? I don't think I mentioned this in my other post but this is a 99 OBS not the newer rounded style. I've noticed in other schematics I've seen online that the 00-06 trucks all talk about a lt blu wire which is why I always tried to look things up for a 98
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jims992500
Novice
Jun 8, 2014, 6:00 AM
Post #6 of 17
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Re: Tail Light issues
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Also let me add that I've done checking into the 7pin trailer plug so it looks like the large blue wire is for trailer brakes(not lights) and the red/orange wire(can't really tell what color it is) is for aux power to the trailer.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 8, 2014, 6:01 AM
Post #7 of 17
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Re: Tail Light issues
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What year does the VIN say it is? (10th digit)
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Hammer Time
Ultimate Carjunky
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Jun 8, 2014, 6:03 AM
Post #8 of 17
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Re: Tail Light issues
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Thew trailer wiring has it's own separate circuit.
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jims992500
Novice
Jun 8, 2014, 6:19 AM
Post #9 of 17
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Re: Tail Light issues
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The dang thing won't let me upload pictures. Keeps saying invalid password and my email isn't even in the database. Anyway, the vin is 1gcgk29jxxf002720, it says a 99 but it is the 98 body style. If it wasn't pouring down rain today I could crawl under it and take pics of what I'm looking at.
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Hammer Time
Ultimate Carjunky
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Jun 8, 2014, 6:22 AM
Post #10 of 17
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Re: Tail Light issues
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We use Photobucket for pictures.
If the VIN says it's a 99, then it's a 99
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jims992500
Novice
Jun 8, 2014, 6:36 AM
Post #11 of 17
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Re: Tail Light issues
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I realize that, I'm not disputing that, I do know there is a difference in the body styles. I'm not trying to start an argument over what year the truck is, I'm just trying to make sure I get the correct information for my particular apllication
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nickwarner
Veteran
/ Moderator
Jun 8, 2014, 1:50 PM
Post #12 of 17
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Re: Tail Light issues
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HT isn't trying to start an arguement either, just needs the correct year so he can pull up the correct diagram. We don't want to give you inaccurate information which would leave you chasing your own tail trying to pin this issue down.
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jims992500
Novice
Jun 8, 2014, 3:15 PM
Post #13 of 17
(1526 views)
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Re: Tail Light issues
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I actually have all the lights minus the TBL and license plate lamps working now. The dumb asses that wired up the 7 pin apparently didn't see the bundle of wires tied up that was meant to add trailer lights. Instead they hacked it into the other end where the bundle that comes from the cab meets up with the branch off to each tail light. Regardless, I hooked the small Dk Blu wire up to the Brn wire and I had brake lights. I'm wondering if the brown wire was cut further up in the bundle and replaced with the blue wire since it actually was sitting outside of the loom. I double checked all the fuses and in trying different combinations of wires after already checking fuses, I must have shorted and popped the one in the dash. I put another one in and had tail lights though I can see that one bulb out of the two on one side is burned out. I'm not sure that the TBL has ever worked but I can at least drive it now while waiting to figure out if that's just a blown bulb or not. As for the license plate, I noticed that the wires had split insulation so I'm guessing there's a broken wire around the vicinity of the connector. I just got rained out before I had a chance to do anything.
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jims992500
Novice
Jun 9, 2014, 8:24 AM
Post #14 of 17
(1509 views)
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Re: Tail Light issues
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I guess I don't have them all working. It appears as though I have a wire shorting somewhere because I pop the brake fuse every time I touch the pedal. I HATE WIRING!!!
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Hammer Time
Ultimate Carjunky
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Jun 9, 2014, 9:06 AM
Post #15 of 17
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Re: Tail Light issues
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The bussing bar is on the rear crossmember.
Brown= LH running lights
Lt Blue= brake lights
Brn wht = RH running lights.
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jims992500
Novice
Jun 9, 2014, 11:40 AM
Post #16 of 17
(1501 views)
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Re: Tail Light issues
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By bussing bar, are you referring to a bundle of wires?
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Hammer Time
Ultimate Carjunky
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Jun 9, 2014, 11:57 AM
Post #17 of 17
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Re: Tail Light issues
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No, I'm referring to a junction block called a buss bar. You can see it in the wiring diagram.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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