I can't get a lock on you, Scotty boost the power....
๐Sorry I couldn't resist Beammeup.
๐ Welcome to the forum and don't take the earlier posts as an insult. This is probably the most civilized RV forum on the internet and posters really are interested in helping.
As far as your camper it sounds like you're on the way to being able to boondock it. Here's a few tips and points that might help.
It sounds like you had the sinks and possibly the toilet running so you want to be cautious that you don't overflow anything. Here's what I would do if it was my trailer.
On the left (drivers side) of the trailer are all the hookups you need. You already found the tank drain, It's the cap on the 3 inch pipe hanging under the trailer. You should have a 3 inch drain hose (we call it the stinky slinky) and it will probably be inside the back bumper. Pull the slinky out and if it doesn't look fairly new throw it away. Now go to Walmart and buy a new slinky from the RV section. Many here like The Rhino hose that Walmart sells but any of the hoses there will work.
Now on your trailer near the dump hose you should see two T handles. these handles control the dump valves on the two tanks and will hopefully be labeled. If the valves are not labeled you'll have to look under the trailer and follow the handle control rods to the actual valves. The black tank valve will be on a 3 inch pipe and the gray tank valve will be on a 1.5 inch pipe. Label or remember the valves as it is important.
Next go find a place to dump the tanks. The dump is gravity fed so be aware of that. Many campgrounds, Flying J stations, Pilot stations, and some highway rest areas have public dumps available for a small fee. You might also have access to a sewer clean out at your house.
Pull the trailer up until the dump pipe is near the hole in the ground. Carefully remove the cap from the trailer dump pipe in case there is some leakage behind the cap. Connect your dump hose (stinky slinky) to the dump pipe and make sure it's twisted fully on. Take the other end of the slinky to the hole in the ground. Step on the lever to open the cap covering the dump port in the ground and stick the end of the slinky in the hole. Many times there is a convenient rock at the dump station that you can use to make sure the slinky does not pop out of the hole when the sewage starts flowing down the slinky. Now go pull the lever that you identified as the black drain valve and wait. You should hear the tank draining or you can put your hand on the outside of the hose and feel the water rushing through. Once the black tank stops draining push the T handle in to close the valve.
Now pull the T handle that you identified to drain the gray tank. You should again hear or feel the tank drain. When it's done close the gray dump valve. We always drain the gray last so the soapy water from the gray tanks can wash out the slinky from the black tank flush.
Disconnect your slinky and stow it away somewhere. You are done draining the tanks although you might want to wash your hands before getting back in the tow vehicle.
Your trailer should have at least three tanks. Fresh water, gray water (Sinks and shower) and black water (toilet).
Fresh water:
You already found that one, well at least you found the water hookup. On your trailer you should find two ports on the outside of the trailer to fill fresh water. One port will have a female hose thread on it and it is for pressurized fresh water. Based on your post above this is the one you have found. Using this port you will not need a water pump as the city provides the necessary pressure just like a garden hose at home. There is a check valve in the interior plumbing to prevent the city water connection from filling and overflowing the fresh water tank.
Before you use the fresh water tank you should sanitize the tank. I'll get to that in a minute.
There is also a port to fill your fresh water tank. This port is a gravity fill to the tank. You put the garden hose in this port turn it on fairly low and wait until it fills up and overflows. Don't turn the hose on too high or you can bulge the tank or worse. Once the tank is full you can turn the hose off and cap the fill port. Now go find the water pump switch and turn it on.
If all the interior faucets and exterior shower (if equipped) are turned off the water pump should turn on and run for a minute or two until it pressurizes the water system then turn off. Once this happens wait for a minute or two to make sure the pump doesn't come back on. If the pump cycles on and off every few minutes you have a leak. go check all the faucets,the toilet and shower, the outside shower, and the pressure relief valve on the water heater and make sure they are not turned on.
Now turn on a cold water faucet and the pump should detect a drop in pressure and turn on. Once you close the faucet the pump should turn off again.
Remember all the water from the sinks and bathtub has to go somewhere and that somewhere is the gray tank.
Sanitizing the tank. Since you aren't the original owner you probably have no idea how the tank was cared for. Here you'll probably have to do some Google searches to find the capacity of your fresh water tank. To sanitize the tank get a new bottle of unscented bleach. You want to use a ratio of two ounces of bleach for even 10 gallons of fresh water tank capacity. A common tank capacity is around 40 gallons which would be a cup of bleach.
Find the tank drain, it will probably be hanging under the trailer near the gravity fill port. Open the valve and make sure the tank is drained then close the valve. Find the water heater and remove it's drain plug, drain it, and then put the plug back in.
Now pour the bleach into the gravity fill port then use the garden hose and fill the tank. Turn on the water pump and go into the trailer. Open a hot water faucet and wait for the water pump to fill the water heater. Once air stops spurting out of the faucet and you get a good bleachy smelling flow of water, turn off the valve. Now open the cold water valve on the same sink and wait until you get a good bleachy smelling flow then close the valve. Repeat this procedure for all faucets, the showers inside and out, and the toilet. Once you have bleach water at all faucets go top up the fresh water tank with the garden hose. Now let the trailer sit like this all night.
Sometime the next day drain the fresh water tank and the water heater. Be cautious if you are wearing nice clothes because the bleach water is going to stain them if it gets on them. Now fill the fresh tank and let the pump fill the water heater. Run all faucets and showers for a few minutes each then drain the tank and water heater again. Fill the tank one more time and fill the water heater. Now run all the faucets again until you don't smell the bleach. Your water system is now sanitized and ready for use. It is recommended to sanitize the system at least once a year.
The toilet drains into the black tank. To use the toilet it will have a lever or pedal to fill the bowl and then to flush. The pedal often fills the bowl by lifting up with your foot and flushes by pushing the pedal down with your foot. Some pedals fill the bowl if you step down half way and flush if you step down further than half way. Always use at least a full bowl if not two full bowls of water to flush down poop or you can wind up with a nasty clog in the tank just under the toilet. CAUTION, do not leave the black drain valve open under the trailer or the liquids will drain out of the tank when you flush and the solids will build up the dreaded poop pyramid under the toilet. Leave the drain valve. I'm referring to the T handle drain valve that you use to drain the tanks. Leave that valve closed until the tank is 1/2 to 3/4 full before draining.
The toilet works the same for a lever flush except you pull the lever forward half way to fill the tank and all the way to flush it. otherwise everything I said about the pedal flush is the same for the lever flush.
Somewhere in the trailer is a monitor panel that is supposed to tell you when the tanks are full. The panel is usually very inaccurate. Many people judge tank capacity by looking into the toilet when flushing to see the level in the black tank.
When the gray tank fills it will usually first overflow into the shower or bathtub.
Your trailer should have a shore power cord inside a hatch on the left (drivers side of the trailer. This is a round 3 bladed 30 amp plug. DO NOT plug this into an electric clothes dryer plug in the garage. The trailer is a 120 volt system and the clothes dryer is a 240 volt system. If you cram your trailer plug into a dryer socket it will fry most of the electronics in the trailer. It's a very expensive mistake that many people on here have made.
Your air conditioner, microwave, and 120 volt outlets are all powered by this shore power cord. You can find an adapter for a few dollars in the RV section at Walmart that will convert your 30 amp plug to a 20 amp standard household plug so you can plug in at home. This will run most things in the trailer, but don't try the air conditioner as the voltage drop on a 12 or 14 amp extension cord could cause the compressor to burn up.
Your trailer has a converter not an inverter. A converter takes 120 volt AC (household) current and converts it to 12 volt DC (automotive) current. An inverter does just the opposite. An inverter takes 12 volt battery current and converts it to 120 volt household current.
If you have a multimeter you can easily find out if your converter is still working. Unplug the trailer shore power cord. Now set your meter to DC volts and go take a voltage reading off the battery. It should be somewhere around 12.66 to 12.75 volts for a fully charged battery. Now go plug in the shore power cord. It's okay to use an extension cord and adapter for this test. Now go take another voltage reading at the battery. If your converter is working your battery voltage should have jumped to 13.5 volts or more.
Your refrigerator works on either 120 volts, or propane (plus 12 volts to run the control board.)Plug the shore power cord in and turn the refrigerator to on, auto, or whatever setting is has besides gas, LP, or 12 volt. Now wait at least 8 hours and then check to see if it's getting cold. If it's not cold after 8 hours, or you smell ammonia or see a yellow powder the refrigerator is shot.
Your trailer also uses propane to run things. First make sure the stove and oven knobs are all turned off. Locate the propane bottles on the tongue of the trailer. You should see that each bottle is connected by a hose to a pressure regulator and then there is one line from the regulator to the trailer. Look at this regulator and see if it has a site glass on it that shows red. A red site glass means that either the tanks are turned off or they are empty. There should be a lever or pointer under the sight glass window. This lever should be pointed toward one of the tanks. Slowly turn the tank that the lever is pointed to on. If there is propane in the tank the site glass should turn green. Now turn on the other tank also so they are both on. Go into the trailer and turn on a stove burner. There should be a sparker incorporated into the stove top to light the burner. Keep clicking the sparker until the burner lights. Make sure all three burners light then turn them all off. Now that there is propane in the lines you should be able to flip the refrigerator to gas. GO outside and stick your ear by the refrigerator door and listen. You should hear a small roar of the propane burner cooling the refrigerator down. If you did not run the refrigerator on 12o volts you will again have to wait 8 hours for the refrigerator to cool down.
You can do the same check on the water heater, although without knowing the make or model I can't help with that.
That's all I can think of about how your new trailer works. Good luck with it and happy camping.
If you have any questions or need clarification feel free to post them and we will do our best to answer.
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2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup