TheTrailerGuy
Bronze Member
Charging with the brake lights is a old trick. It allows just about any tow vehicle to use the trailer, not just ones with a charge circuit. It will work but not right in my opinion.
Chris
Actually, it was pretty ingenious and this is NOT an old trick. It is actually a very new twist on an old trick though. Each unit has a little diode that simply puts a full 12 volts into the battery but doesn't let any draw back out through the same circuit.
And I am sure that it works. Have put them on over 55,000 trailers in the last 8 years since the design came out. Works just like you always hoped it would. Keeps the breakaway batter up and charged and you don't have to do anything but just pull it once in a while.