Great advice on the flushing. I would advise that you put a 5 to 10 amp fuse to the manifold. At the manifold is many amps available and if your alligator clamp touches anything or your cord gets a ding to chassis, you are in for some big fireworks and will blow the manifold's fuse (wherever that is). With the smaller fuse, if you short, it will be a small spark and blow that fuse.
Gale & Hank- 2012 Berkshire 390BH