Have a Coleman 2021 ut400rt 234 miles on it purchased last year from a person who won it in a drawing,p was not giving away until 2024 late, did not realize the running lights not working checked all fuses everything good double filament bulb one filaments light up with brake, turn signals fine front and rear headlight everything okay just no rear running lights, could it be in the light switch, thank you in advance for any help