Join Date: Mar 2002
Location: Austin, TX, USA
Start by laying both harnesses on the floor. Label the connections on your old harness as you remove them. Then you can zip-tie the wires in groups resembling the original harness. Be sure to re-route the regulator wires if you have an internally regulated alternator. Other than that, most of the wiring should be a 1 for 1 replacement. Once you get familiar with the layout, install the harness in the vehicle in place of the original.
Use an ohm meter to verify your connections before plugging them into the under-hood components. This will save you some trouble by avoiding grounded connections and other things that will ruin your day.
Take notes, write down the color code relationships for the old and new wires. There are a few connections which may require you to reuse the original factory connections. Get a copy of the schematic to refer to as you go.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI