The OEM replacement wiring harness that interfaces directly with the Lippert/LCI new-style leveling control brain (part 12656 / 175226). If your existing harness is damaged, corroded, or missing, this is the correct replacement to restore full function to your automatic leveling system -- without replacing the entire control module.
Lippert's automatic leveling systems are built into millions of travel trailers, fifth wheels, and motorhomes. When the wiring harness that connects to the leveling control brain fails -- whether from rodent damage, corrosion, or a prior repair gone wrong -- the entire leveling system goes offline. Part 178278 is the dedicated replacement harness designed to mate with the new-style LCI leveling control brain (part number 12656, also sold as 175226).
This harness is not a universal wiring kit. It is a purpose-built connector harness for the specific Lippert new-style brain module. If you are sourcing or replacing the brain itself, it is sold separately under part 045-12656 / 175226. Both the brain and this harness must be present for the leveling system to operate correctly.
Engineered to connect directly to the Lippert new-style leveling control brain (12656/175226) without splicing or modification.
Replacing a damaged harness is often the fastest fix when the brain module itself tests good but the system remains unresponsive.
Lippert produced two generations of leveling brain housings. This harness (178278) is for the new-style version only -- confirm your brain part number before ordering.
Designed, sourced, and catalogued by Lippert Components -- the OEM supplier for the majority of RV leveling systems in production today.
Lippert updated the leveling control brain design during production, and the two generations use different connector harnesses. The new-style brain (12656 / 175226) typically features a revised housing profile and updated connector positions compared to earlier modules. If you are unsure which version is installed in your RV, cross-reference the part number printed on the label of your existing brain module, or contact Lippert tech support with your VIN for confirmation.