Eradic Turn signals, horn quit Chevy Avalanche?

2002 Z66 1500 2wd 74k miles

for a while when turning on the fog lights the turn signals would light slightly on the dash and outside. Once in a while when turning on the indicator for left or right it would flash really fast as if one bulb is burned out. But BOTH are Flahing fast, front and rear. This week the Wife informed me that the horn quit and now when you try and press the horn the indicators slightly light inside and out. And if at night and turn on the headlights and then the indicators they get faster. But I noticed that if I hit the brakes and slow fast enough that the horn works and the indicators work correctly until I come to a complete stop. Same when accelerating until thetruck levels out. I smacked the side of the truck and the horn works. I took the fuse block apart and checked. Voltage is gping in and out. Fuses good, relays are correct and functioning I even switched the AC to the horn relay which are the same relays and same results. I left the indicator on while I was trying to look at wires. When I piulled on this group of wires the indicators worked and the horn. I also foud that the wireharnes for the trailer lights had a bare wire, the red one, which I quickly fixed, at first when I kicked it the signals worked, then quit again. I think its a bad ground. But I dont have a clue. I asked a mechanic here at the dealership and he said "i dunno" but leave it with them for a few hours at $105 an hour and hell figure it out. HEEEELP just tell me where to look myself. Suggestions. Anything. If its a TV or electronic device I can fix it. But a CHeVy nope. No clue.