Jason,
I think you have nailed it for me...many thanks! Thinking back to my LX200 I had and I was running this off a big car battery and when the a decent slew occured the LX200 used to reboot on me.
The distance from the power supply to the mount is not far as everything is housed in a 3m x 3m rolloff but I am using the speaker grade cabling so in effect I need to upgrade this cabling to something heavier? Like you mentioned and this extention cable sounds like a go.
This is the Powersupply I purchased :
http://www.itspot.com.au/12vdc-8a-sw...+Supply+MP3470+
I actually got mine from Jaycar but cannot find it on their website.
Paul