Rotronics daul battery

you're on to it. I used to carry a small 10mm2 link cable with 2 lugs, a couple of m6 nuts and a 10mm spanner. there is no switch/easy way to do it.

Assuming they haven't changed their functionality no you can't bridge the batteries for starting.

You can select to charge aux, and top up main, or charge main and aux,
or main only.

You could install a separate solenoid to bridge the batteries or a battery
coupling switch.

Being practical, with the Rotronics installed you should never flatten the main,
if you should by accident then just jump with cable.

Cheers
Leigh

I understand that, But I have electric rust control on the vehicle and I only use it every fortnight. So the only way is a jumper lead or a solinod switch.
How would you wire one in.
Is it possible for you to send a wiring diagram
Dan