Hi Richard i am using a Royal with a Spark switch and 3 x 2800 Batteries 2 for PowerBox 1 for Ignition.
I also have a light system from unilights now the question can i use a Y harness from the ignition Batteries to Spark switch and to unilights controller ??
better you connect the Unilight system to the PowerBox. Else you connect the Ground from the ignition with the ground of the PowerBox with the Unilight controller. This may cause interference.
Thanks for the reply i connected the power for the unilights controller to the PowerBox first it was not working but then i changed the voltage on the B side to 7.4V all good now.
I also did the update with my i phone from V 9 to V15 Thanks Helmut