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The s.h error code you are getting on your Tekonsha Primus IQ # TK90160 means that it is detecting a short, and would not be caused by a bad ground. Since you mentioned this is happening when the trailer is connected I recommend starting with checking the vehicle and trailer connectors for any corrosion or debris that can cause a short.
If those check out you will want to check the brake output wire going from the trailer connector to each brake magnet on the... view full answer...
If both of your Lippert Coachsteps are failing to extend it seems like you are on the money with the power or ground issue.
Start with the ground wire and make sure it is connected to a clean surface or possibly relocate it if you can and that may just solve the issue. There may also be a short in the wiring to the common power source so use a circuit tester and check to see if you are getting the appropriate voltage and look for broken or damaged wiring which you will need to replace. view full answer...
Since you mentioned your steps are making a clicking noise that would indicate to me that there is an issue with your motor and it's going to need to be replaced.
You'll just need the Replacement Motor for Kwikee Electric RV Steps # LC379147 for a replacement motor and # LC379160 for the corresponding gear box. view full answer...
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