Thanks again for your help.

The relays are Narva 68048 http://www.narva.com.au/Switches_Relays_1.htmlhttp://www.narva.com.au/Switches_Relays_1.html

The relay did not click at all before the pink/yellow circuit on the controller stopped working.

I followed the instructions given by David Mainprize to wire the external relays. Here is a picture of the wiring http://robowars.org/forum/album_pic.php?pic_id=1386http://robowars.org/forum/album_pic.php?pic_id=1386 Here is a picture of the circuit diagram for the relay http://robowars.org/forum/album_pic.php?pic_id=1387http://robowars.org/forum/album_pic.php?pic_id=1387

I wired the relays onto the wires that Electronize had supplied. They were installed onto the circuit board. I plugged the controller to my receiver and powered up the receiver. I attached an 18 v battery to the inputs of the Electronize. I had my multimeter on the outputs of the relays, pin 30. I found that I had voltage when I moved the lever on my transmitter in one direction, but there was no voltage when I moved the stick in the other direction.

I tried reversing the polarity on 85 and 86 of both relays. I then tested the voltage across pink/green and pink/yellow and found that pink yellow was not working.

I tested another speedo without attaching the external relays. There was variable voltage coming from the heavy blue/yellow wires and there was potential voltage on pink/green and pink/yellow. I attached the external relays to this speedo and got the same result. That is, the pink/yellow circuit stopped working.

Before the modification, pink was definitely the common wire.

The Electronize were working fine for me for the last three or so years before this.