Auto Connectors

Connectors come in three wire sizes and are colour coded.
Red
Blue
Yellow

Faston or Spade Type blade connectors are common on sealed lead acid batteries up to 12V 15Ah capacity.
These connectors come in two types referred to as F1 and F2, the F2 terminal is 1/16" wider than the F1 terminal.
F1 terminals are 3/16" wide (0.187" / 4.8mm)
F2 terminals are 1/4" wide (0.25" / 6.35mm)