Further update. Just left HWH and they had to rewrite the power to my units. Apparently either the dealer who installed the levelers -I bought from second owner- or the dealer who handled my purchased direct wired the unit to battery. HWH connected to accessory fuse behind the foot brake.
This seems to solve several problems, such as frequent dead battery, see other post.
Anyhow, with the fixed wiring the unit automatically turns off when the ignition is turned off. They said wiring directly to batter can cause short in system. I guess if you unit does not go off automatically, a similar retire may be present.
While the e450 was on the lift, The tech also told me that because of where my unit is weighed, there is no way for me to manually release the levelers. The unit is mounted about in the middle of the chassiss. As a result the clearance under the unit in too small to get to valve. Said unit should have been mounted behind the generator.
Fortunately the unit has a drive forward feature to allow you to get off when the levelers are stuck.
Thanks for all comments. By the way, the HWH people are a great group and have hookups for those who have appointments.