The instinct is to start splicing wires immediately. Resist it. Before you touch anything, understand the full scope of the damage — because every repair you make before finding all the damage risks missing something that will cause a fault or a fire later.
Rodents don't chew one wire and leave. They nest, they travel, and they chew at multiple points. The visible damage in one compartment is almost never the whole picture.
-
1Kill power before you do anythingDisconnect shore power and turn off the battery disconnect. Chewed wires with exposed copper can short the moment you start moving things around. Work safe first.
-
2Document everything before you touch itTake photos of every damaged wire before moving it. You need to know what each wire connects to. Photos save you from guesswork on reassembly.
-
3Identify every wire in the affected areaBefore you splice anything, identify what each wire does. Is it 12V DC? 120V AC? A propane ignition wire? A sensor signal? Mixing them up causes board damage or worse. Check the appliance label for wire color codes before you start.
-
4Trace the full wire run — not just what you can seeFollow every damaged wire as far as you can in both directions. Rodents follow wire runs inside wall cavities. Use a continuity tester to confirm each wire is intact end to end after repair.
- ▶Underbelly openings and seams
- ▶Utility bay gaps — water, electrical, LP
- ▶Refrigerator exterior compartment
- ▶Furnace exterior vent opening
- ▶Water heater compartment
- ▶Slideout underbelly gaps
- ▶Basement storage compartments
- ▶Any unsealed pipe or wire penetration
- ▶Stripped insulation — sometimes just the jacket, sometimes bare copper
- ▶Nesting material packed around wires, motors, warm components
- ▶Droppings along wire runs and compartment corners
- ▶Chewed foam insulation from underbelly or walls
- ▶Intermittent electrical faults that clear then return
- ▶Burnt smell with no obvious source
Not all wires are repaired the same way. A wire nut splice on a 12V signal wire that vibrates constantly will fail. A butt splice on a 120V wire without proper insulation is a fire waiting to happen. Match the method to the wire.
-
112V DC wires — heat shrink butt connectorsUse marine-grade heat shrink butt connectors with adhesive lining. They seal against moisture and hold up to vibration. Wire nuts are not appropriate for any RV wiring — road vibration backs them out.
-
2120V AC wires — replace the full run where possibleOn 120V circuits, replacing the damaged section is always safer than splicing. If splicing is unavoidable, use properly rated connectors, cover with self-fusing silicone tape, and keep the splice accessible — never bury it in a wall cavity.
-
3Signal and sensor wires — match gauge exactlyThermocouple wires, sensor wires, and ignition wires are often small gauge and specific. Using the wrong gauge or type causes erratic operation or component damage. Match what was there.
-
4Test every circuit before reassemblyBefore you put panels back on, restore power and test every affected circuit individually. Confirm operation of every appliance in the damaged area. Continuity test every wire you repaired. Do not assume — verify.
-
5Clean the compartment before closingRemove all nesting material and droppings. Use an enzyme-based cleaner — the scent of rodents attracts more rodents. Wear gloves and a mask. Rodent droppings carry serious pathogens.
- ✓Seal underbelly gaps with steel wool and expanding foam — rodents can't chew through steel wool
- ✓Cover vent openings with 1/4" hardware cloth — not window screen, mice chew through it
- ✓Seal all pipe and wire penetrations through floors and walls
- ✓Close all compartment doors when stored
- ✓Check slide underbelly seals — gaps appear when the slide is retracted
- ✓Peppermint oil on cotton balls in compartments — refreshed monthly
- ✓Fresh Cab or similar botanical repellent pouches in each storage bay
- ✓Snap traps in basement bays during storage — check and reset monthly
- →Do not use poison bait in or around the RV — dead rodents in wall cavities cause odour and secondary poisoning of other animals
Every time you return to a stored RV — before you connect power, before you turn anything on — do a quick walk-around of all exterior compartments. Look for droppings, nesting material, or obvious entry damage. Two minutes of checking before your first power-up can save you from discovering a fault at the campsite.
If the RV has been sitting for more than 30 days, pull the furnace cover, the water heater door, and the refrigerator vent panel and look inside. These warm, enclosed spaces are where rodents nest first.
If the damage involves 120V AC wiring, if you're uncertain what a wire does, if there is burn evidence around any connection point, or if multiple systems are affected — get a qualified RV technician to assess the full scope before you start repairs. Rodent damage to 120V circuits is not a DIY repair.
The Pocket RV Tech is here to help you understand what you're looking at and what needs professional attention. When in doubt, visit our Resource Directory for verified manufacturer support contacts.