You're refering to the Battery [aka"B"] Harness for Starter and Oil Pressure Sender Sensor

Photos 2 & 3 at end of thread are of cable at oil filter and connector [to its right when facing engine]. http://www.peachparts.com/shopforum/showthread.php?t=167567

Most likely the battery cable is ok. A few dollars for wire and a little soldering and you can DIY as I did. But you have to do some connections from under car. Connector [photo 3] uses pin connections to wire. De-solder and reuse them.

Oil level = Brown/Black [left side, front, bottom of block]
Oil Pressure = Brown/Green [left side, below oil filter]
Solenoid = Purple/White [on starter]

Bob
PS Good to disconnect battery ground before DIY.