This is a common fault.
Tony
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Maybe wear looser shorts mate an then you'll be able to find it hahhahahahahahahahahaha
Best bet Ross is to shoot down at a Auto-Sparky, they will do a load test on the battery and see if its any good.. They can also do a current draw test and see if something in the vehicle is sucking power when everything is off.. One of those will tell you pretty quickly what the problem is.. Let us know how you go Rossco
Fletcha