I rewired the stereo and brought all the wires to my fuse box where it has a 12v always on and a 12v ignition.
Both my memory and ignition lead were coming from the same place in a mass of wires behind the dash, so I cut them out and put them over in their proper places in the fuse box and that's when this started. I have a feeling that the previous owner had the same problem which is why he spliced both power leads into the 'always on' power.

the car is from 1971, so I have a feeling the alternator was not designed for this kind of a stereo.

However, I never had the problem of my lights dimming with bass hits or any other problems that I read about from the links on the FAQ so I'm not sure.

By checking the wiring are you suggesting the wiring to the empeg, amp... or everything in the car?