Of the many steps in the process of assembling a wire harness, testing the crimped terminal is a crucial one. If the terminal hasn't been properly attached to the end of the wire, it can cause the wire and eventually the entire wire harness to fail. Most manufacturers use pull testing to assess crimped connections and ensure that terminals are properly attached.
Automotive innovation is driven by environmental, safety and lifestyle requirements. This means manufacturers are putting more electronic content in their vehicles with ever-increasing numbers of electronic control units (ECUs).
With standards for wire harnesses getting tighter, harness assemblers are increasingly using crimp force monitors to ensure quality connections. However, that technology can only tell you how well the crimping process is working. It can't make the process better.
Size definitely matters when it comes to processing wire. Small wire (26 AWG or higher), for example, presents different challenges than large wire. This is especially true regarding crimping.