Yes, the Sea King has a big thing in the nose called a battery, which produces wiggly amps to the starter generator which turns the engine around while also sending amps to the ignitors which clack away making sparks to ignite the combustible stuff which is sprayed into the appropriate part of the Gnome.
There is no APU, but the blades & No 2 engine can be stopped and the No 1 engine runs the accessory drive train (gens and hyd pumps).