In 1974 he signed as an undrafted free agent with the San Diego Chargers and played in the preseason with them earning him a spot on the team. He won the starting job over Bo Matthews who was drafted second overall in 1974.[3] After an injury in October 1974, halfback Don Woods got Bonners job and then after him took Mattews the starters position. In December 1975 he got fined $50 together with Harrison Davis and Sam Williams after a shouting incident with Coy Bacon and defensive coordinator Jackie Simpson.[4]