maffysdad Judging from picture 3, these are the old connectors that have the smaller contact point when joined together. Far better to go for the newer version with the over-spring on the female which offers better contact area and a more positive connection.

maffysdad Red wire goes to constant +12v battery positive. Black wire goes to constant battery negative. (The above two are your main power and keep the device battery charged. I'd red or black are cut the device can be set to warn you of power cut). Orange (optional) goes to ignition ACC or AUX. This wire just allows you to determine if the ignition has been turned on. Yellow is used to provide a +12v output to the coil of an external relay, that in turn can be placed in-line to cut power to the fuel pump. Make sure you set up the SIM card first. These are neat little trackers.