Changing Batteries.

Today was the day to replace all 6 of the batteries.  Old ones out and new ones in while the boat is on a mooring.  All transportation by dinghy.    Marine batteries are very heavy (about 60 lbs apiece) and, when you have to crawl into the engine compartment and lift them almost to eye level while you are on your knees...  Luckily I had help for that part then he left.  The old ones were almost 7 years old and don't really owe me anything.  I wired each of the new ones  BUT when we tested everything, the two bilge pumps did not work.  Now which wires did I not connect?   On and On but finally, after 5 hours total, everything is working and powered.