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Best to use like jumper cables to TEST for proper ground circuit - - connect jumper cables to a *known good* metal ground on trailer - connect other end to a *known good* metal ground on vehicle - now check lights operations..
‘IF’ proper voltage is present at vehicle trailer plug but trailer lights aren’t working - - you can bet there is a ground circuit problem between vehicle and trailer!
Just having the trailer hitched to vehicle does not promote a proper ground circuit..
Do the recommended test!
Best to use like jumper cables to TEST for proper ground circuit - - connect jumper cables to a *known good* metal ground on trailer - connect other end to a *known good* metal ground on vehicle - now check lights operations.. ‘IF’ proper voltage is present at vehicle trailer plug but trailer lights aren’t working - - you can bet there is a ground circuit problem between vehicle and trailer! Just having the trailer hitched to vehicle does not promote a proper ground circuit.. Do the recommended test!