Toyota Celica 1985 mileage 80,000

I hardwired a kenwood cd player inside my car and my caution lights won't come on. That's when I noticed the problem. My head and signal lights come on but not the caution lights. Are they not coming on because I may have used or cut a wire or what? And my friend has the same problem with his 1987 pickup but his signal or caution lights won't come on just his headlights. Can somebody help