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I recently installed a 2nd battery in my GQ, installed under the bonnet, so far my experience with the Red Arc (SBl12 I think), has been all good. It also has the override to let me start off the aux battery should the primary go flat, assuming the aux has sufficient charge of course. I got a full wiring kit with solenoid delivered for about $230 from ebay.
I did a heap of research, asked lots of questions etc before doing mine, and I'm happy with the result for my situation. I'm sure more experienced guys on here may have different / better opinions than mine, but that's just my 2 cents, and my experience (so far anyway). Good luck with whatever set up you choose. Would be worthwhile asking an auto sparky or two how they would do the set up in your situation. If you aren't confident with auto electrics, I'd suggest getting a qualified auto sparky to do the job, might save a zap, or damage / fire etc.
Last edited by Patrol'n; 10th December 2014 at 02:03 AM.