O/T wire help

There are several OEM wires wrapped in black electrical tape on the drivers side from the firewall of my 1962 Galaxie. Using a test light, one wire lights up with key in the ON (right)position but is dead when key is in assessory (left) position. This must be ignition wire that goes to + side of coil. Another wire "PULSES" in either position and 3rd wire is very weak in both positions. Anyone know what the pulse wire and weak wire are for?