Did you use the relays? What guage wire are you using? Where did you tap your power?
If you didn't use the relays and you left the lights and their switch in the same circuit, this could most certainly happen. Follow the instructions that came with your KCs to the letter, use 10g wire, and for heaven's sake, get your power and your ground at the source (battery).
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kjw & the
PNUTMNM
"McDonald's tells kids that hamburgers grow in hamburger patches. It's a lie! Ronald McDonald is a scary, scary clown..."
- PETA online
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kjw &
the PNUTMNM
The liver is evil, and must be punished...