Wire Harness

My G-body (the Regal in my sig) was owned by my parents since new in the mid-eighties. I maintained it for them the entire time and they passed it on to me about ten years
ago. The reason I mention this is because this is how I know the wire harness is mostly original. The only wires that Ive replaced are the battery & alternator cables. Today when I was replacing the starter (old starter was turning engine over slowly), I noticed how minimalistic the two fusible link supply wires were. I want to say that they are like 14/16 gauge or something around that. It amazes me that these two main supply wires are that small considering all of the power accessories this car has. Has anyone else noted the same? Has anyone here replaced said wires all the way back to the fuse block?

If most upgrades (eg: cooling or radio) are wired directly to the battery what is typically used for a terminal block?

pontiacgp said:

it's just about the same since the systems are still turned off and on as they were before the upgrades. My radio still turns on like it did before but the only power that is needed is to turn on the amp and display on the radio.

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Let’s say that the ignition +12 V is utilized to control the Relay, how is the high current +12 V connected to the battery?