Re wiring 79 Series LC

will that sort of thing void the warranty?

ok, good thinking... just a q for you though.
if i flatten one battery overnight, then when i hook the batteries up, will it not try to flatten the other too? ie will there be enough charge left to start the car or not? assuming that the battery is completely flat (worst case)

If you flaten the main battery overnight, you need to switch on the two batteries togethor to start, (Id use a switch that you have to hold, that way you cant forget to switch it back) and then the alternator would procede to charge the flat battery, (the main) and when it reaches the predetermined voltage, the aux battery will start to charge, so the only problems that might arise, is if you dont drive very far in a day, the aux battery mightnt fully recharge, but this is a problem anyway, as fully flattened batteries do take a while to recharge, whether they are main or aux batterties.

I have no idea whaether my idea is good or not, but I think it would suit my use better than just a normal isolator instalation.
One thing you might need, (and I beleive its a good idea anyway) is a good charger at home, so when you get home, you can make sure both batteries are fully charged, and will be ready next time you utilise the full amount of charge they have.

Ive actually been thinking about running two N70 type batteries in parralel, with a third smaller battery hoked up like I said as a backup/start battery.

If any sparkies here know why I shouldnt do this Id like to hear.

i think your idea is a good one! but what i really want to know is when i have a flat battery, and push the dashboard mounted switch to join them together for starting, will there be enough power to start the car? or will all the power go straight to the flat battery?

As long as the battery is of sufficent size and in good condition, it will start the car, it wont try and eaqualise instantly.

Thanks Tritondriva, I will try it out when the new rig gets here and let you know!

There is no requirement for the headlights to run off the main or aux battery in particular, just so long as i can run them/radio/whatever else i want to whenever they might be needed, without having to start the vehicle (ie setting up camp at night).
I dont think that the sort of setup that has been refferred to up here (modified dual battery setup with extra dash mounted relay switch) would be a warranty issue?

Ok, this seems like the smartest setup to me! Thanks for your input! And thanks to all of you for your input!