Ok i got a set of these hella horns but the problem is that the stock wiring is of course a gm plug with only 1 wire! So i guess that 1 wire is the power and the unit grounds itself to the frame that its bolted too?

Anyways heres a pick of the new horns i got, they have 2 connections on it and no markings so which one do i use and do i just cut the stock connectors off and connect the wire to only one connector on the new horns?

 

If there isn't a plus and minus on the connectors then it doesn't matter which is hot and which is ground. I just made a short jumper that went from the neg. to the bolt that went though the mount bracket, i.e. grounded to the frame. On new cars with all the plastic you may want to run the ground to one of the universal ground posts that are located around our engine bays, or to the neg. side of the bat. Sense you didn't ask I assume you know how to wire the relay.

P.S. if there is a number 1 and 2 on the connectors 1 is hot 2 is ground.