Https://www.instructables.com/answers/Polarity-switching-issue-first-one-to-resolve-get/ Polarity switching issue, first one to resolve gets a one year pro membership, if answered by June 03 2012 Ok, here's the issue. years ago i picked up a wireless remote control kit for automotive use. It consists of a 12v receiver with 4 sets of colour matched wires. Basically you can turn on and off 4 devices. Press button 1 on the remote and a on-board 15A relay activates completing the circuit for one set of wires. Press button 1 again and the same relay cut outs and the circuit is broken. These wires are designed to interrupt the negative or ground side of your accessory with the positive lead hooked up to your power source. The receivers power is hooked up to the 12v battery. I even went so far as to open up the receiver and discovered the entire circuit to be potted in opaque epoxy (how rude) so no modding of the circuit sadly... What I can't get my head around is how to utilize this as a polarity reversing unit, or can it. Now I have messed around with using polarity reversing circuits in a analog style before, I even wrote an instructable on making one with a DIY DPDT switch Here's the thing, I live in a remote area of the world and do not have immediate access to what most people are used to, so is this circuit possible to be utilized in the manner I am wanting? I have access to additional standard 4 pin relays if this helps, but not much of anything else. First person that provides a detailed anwser, which results in this working the way how I want, utilizing what I have, by the end of JUNE 3 2012 will receive a 1 year pro instructables membership. With a possible 3 month pro membership to the one who proves most useful in finding a feasible work around by JUNE 5th 2012. And sadly using alternate supplies is not an option, "pretend I am on the moon, with no transport available in time". see the pics Note: in the diagram, the green wires are one switch, the blue wires are another. Their are 2 more sets of wires but these are being used to control other items and are not shown.