Most engine start procedures I've seen and followed have both Engine Hydraulic Pumps ON - and both Electric Hydraulic Pumps OFF
Then I stumbled on this YouTube video and noticed he has the two left switches OFF and the two right switches On while starting Engine 2.
See it at the 1:30 mark in the video:
https://youtu.be/ae20L78imO4?t=1m20s
Is he doing it right? Is he doing it wrong? Does it matter? What's the difference?
I thought the engine pumps should always be on to preserve the solenoid life... perhaps that's trivial.
Anyway... the video made me curious.