You have a question about an ERICH JAEGER product or concerning the installation of your wiring harness kit for trailer towing devices? Browse through our FAQs on control units, wiring harnesses and further components and you might find your answer.
Why is a 12-volt power supply to the trailer control module needed?
So that an electronic control module can “work” and “function”, the module needs a permanent 12-volt positive connection. Without this power supply, there will be a fault with the indicator and on the trailer lighting.