Install the cable holder and plastic cap

Fig 1: Identifying Plastic Cap And Cable Holder

Courtesy of VOLVO CARS OF NORTH AMERICA.

Install: 

• the cable holder. Tighten the nuts, Tighten to 10 Nm 
• the positive cable and integrated relay/fusebox nut. Tighten to 25 Nm 
• the screw on the clamp around the positive cable
• the plastic cap at the positive cable.