Andromeda

One more thing, excuse my ignorance, but I assume you mean the internal speaker wire not the Bell box (SAB) wiring, right? This is brown in the photograph and also a positive component which is connected to one of the +ve aux terminals which is an orange wire in my case, but I don't think you can see that from the picture.

Thanks for all your help, it's much appreciated. Just to clarify the picture is from a few days ago, I no longer have it all wired up.

Just above the RS485 terminals there are 4 +/- aux outputs (these have red and black wires in the picture), the fuse blew in effect by shorting these terminals (touching red and black wires at a PIR).

Board is doing this without any load only ac power on and no battery connected, I am measuring 6v dc from aux o/p's. Have a g2-44 and two g2-20's all with the same symptoms, I blew the aux fuse on 2 of these boards prior to this happening - this of course maybe related to my problem, old age and forgetting to power down unit prior to pulling a cable causing +ve and -ve to short out. But one of the boards came from eBay which measuried this way before any load put on it. This isn't just happening to me I guess?!

Panel was obtained from eBay and the rkp is the mk7 keyprox which I've had on my system for 7 years, the only loads on the panel were the keypad. Does is problem permanently damage the g2-20 board?

Hi, I have the same problem with a g2-20 did you ever get to the bottom of the problem? I have bought another g2-20 card and I have the same problem and now the 12v doc Aux outputs are outputting continuously at 6v not enough to power up my rkp.