1. Five systems to recognize
An RV combines multiple systems inside a moving structure. Understanding their boundaries helps you explain symptoms and make safe decisions.
12-volt DC system
Typically supplies lighting, fans, controls and many water pumps from the house battery and converter. Low voltage may affect appliances even when you are connected to shore power.
120-volt AC system
Often supplies outlets, some appliances and the converter when plugged into an appropriate shore-power supply. Breakers and ground-fault protection are important; do not open energized panels.
Fresh and wastewater plumbing
Includes a fresh tank or city-water connection, pump, fixtures, water heater and separate wastewater holding tanks. Leaks require prompt attention to avoid structural damage.
Propane and climate control
Many RV furnaces, cooktops and water heaters use LP gas. If you suspect a leak, leave the area, avoid switches and ignition sources, and contact emergency services or qualified help.
Exterior and structural envelope
Roof seams, windows, doors and penetrations must be inspected for moisture intrusion. Early identification can reduce hidden damage.
2. Describe a problem like a technician
Record the RV year, make and model; whether you are on battery or shore power; the exact symptom; when it began; and any recent changes. Provide photos where helpful. Avoid trial-and-error bypasses of safety devices.
3. Quick knowledge check
Which system usually powers RV lighting and a typical water pump?
Continue learning
See the planned course catalog, or ask Michigan RV Repair about an issue with your camper.