This modular system plugs together to accommodate most vehicle and trailer combinations. Modular plug-in simple designedformany different models No cutting, splicing, soldering, or taping Pre-wired to provide right and left turn, taillight, and in some models the backup function Optional Pre-wired 4-wire flat to 6-way round and4-wire flat to 7-way RV blade round extension adaptors are available to custom install the vehicle side wiring to most trailer combinations Kit includes: Terminal grease Cable ties A ground screw to maintain proper ground A dust cap to protect the 4-wire flat Each package includes a power converter