Jon:
This is what I recall Ranger gave me as a list for winterizing....
Winterizing Procedure
Head - Close multiport thru-hull seacock. Fill multiport strainer with RV antifreeze. Operate toilet until pink antifreeze appears in toilet. Flush to ensure lines to holding tank receive antifreeze.
Wash down system – Ensure multiport strainer seacock is closed. Add RV antifreeze to multiport strainer. Turn on wash down pump and allow to pump until antifreeze shows at spigot.
Engine – Ensure the multiport seacock is closed. Utilizing a helper, pour RV antifreeze into the multiport strainer as you start your engine. Run the engine until pink starts coming out your engine exhaust
overboard discharge. Leave seacock open when these first (3) procedures are finsished.
Holding tank - Empty holding tank. Pour 3 gallons of RV antifreeze into waste pump out fitting on deck. Operate macerator switch until pink antifreeze shows at thru-hull.
Fresh Water system – Empty all water out of the tank by pumping it through the faucets. Ensure the hot water heater is also emptied. (use faucets to empty or drain valve at hot water heater). Add RV antifreeze to the fresh water tank through the fresh water deck fill fitting. Turn on the pump and open all hot/cold faucets until pink antifreeze is showing. Ensure the hot water tank receives antifreeze by operating the faucets in the hot position also. Also be sure to introduce antifreeze into the city water inlet by pouring fluid through a funnel into the city water connection.
Bilge pump – Ensure keel drain plug is installed. Pour antifreeze into the bilge and run the aft bilge pump until pink is showing at the overboard thru hulls. *Note: The attitude of the boat may require more or less antifreeze to reach the bilge pumps.
Air Conditioning - Remove the hose from one end of the seawater intake filter. Using a funnel pour antifreeze into the hose and operate the system until pink shows at the air conditioning overboard discharge. Make sure to leave seacock open when finished.
Generator - Remove the hose from one end of the seawater intake filter. Using a funnel pour antifreeze into the hose and run the generator until pink shows at the generator exhaust overboard discharge. Make sure to leave seacock open when finished. *Quantities of antifreeze are approximate and will vary depending on boat attitude, spillage, etc.. It is important that antifreeze reaches all systems that can freeze. When in doubt use more antifreeze.