1. Check the step switch to be sure it's on.
2. Check for good, clean, tight ground connection.
Often it's one of those.
If not, give more details or symptoms. Someone should be able to help. Good luck.
Jim & Shirley & Abbie (Scottie)
2013 Newmar Canyon Star 3911
2005 Dodge Grand Caravan Toad
Jim & Shirley & Abbie (Scottish Terrier)
2013 Newmar Canyon Star 3911, 2005 Dodge Grand Caravan - Braun Accessibility Modified Toad, Remco Lube Pump, 5 Star Tune, Progressive Industries EMS-HW50C, Coach Net Emergency Road Service, FMCA 378968