Mattax said

I hear ya.

Looking at the early (1960-62) diagrams helps explain some of the wire color and junction loations that developed later on.
Typically for late 60s the codes and colors were
A is Battery output and recharge. Black or Red but always red at the ammeter so the meter reads in the correct direction.
R is Alternator circuits. R6 is alternator output. Black
J is Ignition and engine.
J1 is often power to ignition switch. Usually red, some early years black.
J2 is ignition (includes power to voltage regulator). Dark Blue or blue w/ trace
J3 is ignition feed when key is in start. Brown
Q is Accessory feeds
Q2 is switched accessory feed - (pretty much everything which requires key on other than ignition). Black
L is typically exterior Lighting.
H is usually Horn. Violet power feed to relay.
G is gage

Orange is usually instrument, radio, console lights
Pink is often feeds from the fuse box to brake light switch etc.

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