I've come to realise my leisure battery is toast, as it wont hold a charge. I 1st thought it was my smart relay set wrong, but having 'hard-wired' the batteries together (disconnecting the adjoining fuse when using the leisure battery) it is indeed the battery that is gubbed.
Now, as we're just back from holidays and have been lazing about all weekend, i discovered this morning i forgot to remove the fuse from said joeyed up contraption and the main battery has been discharged, possibly due to stereo being left on!

I have a new leisure battery still to fit, so would it be safe enough to connect him up in this fashion in the hope that it will trickle into the main battery enough to start it? or maybe use the leisure battery in parallel to start 'em up?
hmm.

any help would be great
Craig