Electrical Questions / Wiring

Once you have done the MAD conversion, that removes SOME of the weak stuff in the car. You have to constantly keep in mind several things..........

These cars were REALLY under-fused compared to today, and were not "meant" for large power hungry options. Ma knew the ammeter was a problem, as she had what has become known as the "taxi / fleet" wiring which was a "MAD like" mod to relieve the bulkhead

But that ain't all

Other connectors and switches deteriorate, and unlike 1970, you can no longer buy solid replacement quality replacements for switches, certainly not OEM

So be careful of stuff like your headlight and ignition switch. you can relieve the ignition switch by using it to trigger relays instead of operating loads directly. Crackedback offers a nice add-on headlight relay kit on here.

Be careful where you tap off for your new stereo. Once you get the MAD change done, the starter relay "big stud" is a good place. As said above, if the new system needs key switched components, use a relay, fused separately

You are going to have to expain what you mean by "Big Three" upgrade?

If you are referring to only upgrading the ignition, with an otherwise factory underhood harness, that should not affect or be affected

"As you get into this" I'll probably step you through to be sure the charging voltage is correct. This may or may not get into harness voltage drop issues.