Originally Posted by THEMACS3
Perry, I don't have the battery installed right now, but I'm getting 18v at the battery connector.
I wonder if that's why. Some circuits are designed to operate ONLY with their normal expected load connected. Now, I am not an electronics expert, but I think that the no battery condition could be an influencing factor.
Did you measure the voltage in the same way at some other time and find a different voltage?
Of course, you need a battery if you are going to travel. No battery means no emergency power to activate your brakes, in the "worst case" scenario of your trailer disconnecting from the tow vehicle.