ground wire question

This morning I was wiring my 1996 toyota camry for the trailer. I was confused by the instruction of the wiring kit. I don't know if I can connect the ground wire to the existing vehicle ground wire?

There are two wires for the turn light in the existing electrical system. One of them is the ground wire. Am I right?

thanks,

Yeah, one of the wires is a ground because the general electrical system is a hot wire and a ground wire for DC currents. They call it a common ground. So you can connect all the ground wires together if you wanted or you can have them grounded seperately. What ever is more convenient or smarter...

BTW, the trialer wiring kit is generally just for lights and what not. Unless your trailer is based on LEDs, then it doesn't matter how you connect the wires as long as you get voltage on one wire and ground on the other.