OK I got my euros in last night, it was fine at first but after the maiden drive I went to an eat out place, I went to click the FOB alarmer and the alarm went off. Strange I thought. Then went to another place after we left there I noticed my tail lights were out and so were the brakes lights but the flashers still work. I also noticed when I stepped on the brakes that the dash lights and fog lighs would illuminate, as if I had turned on the parking lights. But the rear brakes were totally dead. This told me it was a ground problem. I unplugged the euro harness, cleaned the connections and then plugged them back in, and checked in the garage, all was well. So I drove the car to work today, it was fine on the way down. On the way home, I first checked the car to make sure the tails and brakes were working. They were.

As soon as I got around the first 2 turns, a fedex driver flagged me at the light and told me that my tails were out. Great. I pulled into the next parking lot, and got on my back in the 10 degree weather, and undid the euro harness and replugged the OEM harness back in so at least I would have tails and blinkers just like OEM.

I go back home, replug the harness in and this time very carefully try to recreate the effect. I tugged and twisted on each wire. I even heated the weather pack up with a heatgun to simulate the heat from the muffler. I banged the weather pack around while laying in a dark garage so I could see the reflections of the tails. I vibrated the other lights to make sure that perhaps a filament in a bulb wasnt shorting out or going haywire. I got the lights to flicker ONCE but could never do it again. I'm out of ideas now. Has ANYBODY heard of this or know what exactly to look for?

From the sounds of it, it is probably the ground messing up in some fashion. I checked and tugged, twisted and bent the black ground wire for the harness and checked the splice connection and it wouldnt do it. I'm going to try it again tonight and drive around in the 5 degree weather and check the rear to make sure my lights are still working. I hate tracing intermittent hard-to-repeat problems.

Yes I've cut the white wire, although I dont think this has anything to do with it. Help!

 

I had a on going grounding problem in which my turn signals and hazzards would disengage my cruise control not to mention was getting a periodic message on my DIC about service AH service TC. To make a long story short, check the ground just behind the driverside rear wheel. Mine was loose and a bit corroded (will address that in the spring). Once I tightened the ground....for now all my issues went away. It just might be you have a defective harness. When I removed my Euro's and inspected the harness and the crappy connectors the use are all corroded not to mention one of the grounds wires were exposed. Here's the link to the long virgin if your interested, good luck!

http://forums.corvetteforum.com/showthread.php?t=989591


The OEM are back on, I will need another harness if I put the Euro's back on, I'll make that decision in the spring

 

Remove, inspect and clean ground G-401 and G-402. If that does not fix the problem, please let me know.

Bill C

 

I see the ground thats the eyelet style behind the drivers wheel, but the passenger side, theres a stud there (directly opposite the drivers side one) with nothing connected to it. Where is the passenger rear ground?

Oh BTW, I think I've narrowed the problem to the harness itself. Its wierd because once it comes on, it stays on. But as soon as I drive off within a few miles or so it will shut down and not turn back on. It did it tonight while I was trying to play in the snow so I came back home, after getting stuck in the driveway and laughed at by the neighbors I got the car into the garage. I poked around the harness and boom the lights returned. I then was able to basically replicate what had happened by unplugging the connector and inserting it in only part of the way.

I wonder if I can get that weatherpack and redo that connector, cause all of this started when I put the euro pack on. Or- since it is most likely the ground wire (if it was another, a single set of lights would not illuminate but not cause the strange stepping on the brake phenomena) if I just regrounded that area with a tap splice on the OE ground wire with a new ground wire run to one of those grounding points, that may cure it. Ill do that tomorow....

 

On some model C5's (I believe 2001 and above, but I could be off by a year or two); GM only used the one on the drivers side. My 02 Z06 only has one.

I would remove the harness and inspect all of the connections wires and connectors.

BC

 

I was able to simulate exactly what happened and I'm almost 100% sure it is the harness of the new euro light, the one that plugs into the "rear" part of the existing harness. I was able to come up with a fix, although sort of rigged it should work. I simply ran another ground wire from the driver side ground point and spliced into the ground wire of the tail light bulb. Now, even if I unplug the harness 1/2 way, the tails will function properly. Of course, only road testing and time will tell for sure if the fix worked.