Taillight malfunction, Need Help!

[Cody]

So heres the deal... I have a 95 Chev K1500 when the headlight switch is set to off the brake lights and rear signals work fine, unless I press the brake pedal when I have the signals on at which point I get a rapid flash up front and a very faint blink in the rear. If i turn the headlight switch to either of the other two selections my rear taillights lose all power. The only way someone would know I was braking would be my 3rd brake light.
I have HIDS, Ive replaced the headlight switch, the relay under the dash labeled for my lighting and checked all the fuses. Anyone have any ideas?

 

[IOWNJUNK]

Sounds like someone cobbled up a trailer wiring connector and got some wires crossed up.

 

[SCOTTYINWV]

Pull the front turn signals. I found this. I had the same issue.

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[IOWNJUNK]

Yeah, I can see that causing some problems.....

 

[poncho62]

Either of the above......and check your grounds

 

[98_k1500]

Either of the above......and check your grounds

The ground wire on the bed can do some crazy stuff if its corroded/broken. Its on the drivers side frame rail just ahead of the rear bumper bracket. Would be a good place to start anyway. This is usually the problem when the symptoms change when the headlights are on/off.

 

[eric.s.t]

I had a bad wiring harness that was hacked up for trailer lights, and it caused the lights do that too! Check your wiring harness by your back bumper.

 

[ragz64]

also check all your ground wire from the cab to the engine...on the right side under the a/c drier to the back of the right cylinder head...mine was loose and caused me fits....

 

[sewlow]

There's also a braided ground wire from the frame to the back of the engine block or head. Passenger side.