I'm slowly putting back together my 72 Cuda after it's paint job, and i'm in the process of putting the wiring harness's back in and wiring up a sound system. The motor will not be going in for a while but I would like to test the electrical system (lights,audio etc)

To hookup the battery temporarily (which is in the trunk) Can't I just run the positive cable to the starter relay and negative to a good body ground ?

I just did the amp meter fix and bypassed that problem.

Am I missing anything or any suggestions !