where is the common ground for the horn, cluster, and brake lights

 

dont think there is a common ground for all them. they are at different ends of the car. theres a main ground underneath the dash on the right hand side on one of the mounts for the dash itself(10mm bolt). might be on the other side for you, mines right hand drive(uk). theres also one on the metal support/surround for the steering column, i belive this can be accessed by removing the cluster. its more likely to be a +ve side fault tho surely? im pretty sure they are common at one point in the circuit... fuse box maybe?

 

Well I think that the dash harness ground would be on the steering column as he said above if you crawl under there you can see it the bolt goes stright up into one side of the coloumn. It would be on the right hand side of the column if your sitting in the seat.

 

the whole thing is messed up and my injectors were tied into them as well and those all dont work

 

the earth for the injectors(mine, anyway) is via the ecu. find it, find one of the thick black wires that comes out and trace it as they are all common within the ecu as the problem could be there. agian tho, are u sure its not the positive side of things? because the horn and lights are nowt to do with the ecu but they may all have a common supply. the ecu earths the injectors to fire them, not supplys 12v, thats alredy there, independant of the ecu on an ignition switched supply.

 

power to the injectors went boom, they are now wired to the battery directly