RVTI Level 1 Certification Exam 2026/2027
Recreational Vehicle Service Technician Certification
Version A & Version B | 100 Questions Each | Verified Correct
Answers
VERSION A (100 Questions)
System: Electrical (12V DC)
Q1: A customer complains that their 12V overhead lights are very dim when the RV is
not plugged into shore power, but brighten when plugged in. The battery is new. What is
the most likely cause?
● A. A failed 120V circuit breaker.
● B. A faulty converter that is not properly charging the battery or supplying 12V
power. [CORRECT]
● C. A blown 12V fuse for the lighting circuit.
● D. A failed inverter.
Correct Answer: B
Rationale: B is correct. The converter has two main functions: 1) Charge the battery
when on shore power, and 2) Supply 12V DC power to the RV's 12V systems when on
shore power, bypassing the battery. Dim lights on battery alone suggest the battery is
undercharged. Lights brightening on shore power indicates the converter is supplying
12V directly, but its charging circuit is likely faulty, leaving the battery depleted. Why
others are wrong: (A) A 120V breaker wouldn't affect 12V lights on battery. (C) A blown
,fuse would cause no lights, not dim lights. (D) An inverter converts DC to AC, not related
to 12V lights.
Q2: When testing a deep-cycle RV battery with a digital multimeter, a technician reads
12.2V at rest (no load, not charging). What does this voltage indicate about the battery's
state of charge?
● A. The battery is fully charged at 100%.
● B. The battery is approximately 50% charged and should be recharged.
[CORRECT]
● C. The battery is completely discharged at 0%.
● D. The battery is overcharged and damaged.
Correct Answer: B
Rationale: B is correct. Battery Voltage vs. State of Charge (Resting): 12.6V+ = 100%
charged; 12.4V = 75%; 12.2V = 50%; 12.0V = 25%; 11.8V or less = discharged. A reading
of 12.2V indicates the battery is at approximately 50% state of charge, which is the
minimum recommended level before recharging to prevent sulfation and permanent
capacity loss. Why others are wrong: (A) 12.6V or higher indicates full charge. (C) 0%
would read approximately 10.5V or lower. (D) Overcharge would show elevated voltage
immediately after charging (13.0V+) but would not damage the resting voltage reading
in this manner.
Q3: A technician is troubleshooting a 12V circuit where the fuse keeps blowing
immediately upon replacement. What is the safest and most logical first step in
diagnosis?
● A. Replace the fuse with a higher amperage rating to see if it holds.
● B. Disconnect the load and use a multimeter to check for a short to ground in the
wiring. [CORRECT]
● C. Wrap the fuse in aluminum foil to bypass it temporarily.
, ● D. Check the battery voltage first.
Correct Answer: B
Rationale: B is correct. NFPA 1192 Safety Standard & Diagnostic Procedure: An
immediately blowing fuse indicates a direct short circuit (excessive current flow). The
proper procedure is to: 1) Remove power (disconnect battery or shore power following
lock-out/tag-out), 2) Disconnect the load, 3) Use a digital multimeter set to continuity or
resistance to check for short-to-ground in the wiring harness. This isolates whether the
short is in the wiring or the component. Why others are wrong: (A) & (C) Violate safety
codes—never upsize fuses or bypass protection; this creates fire hazards. (D) Battery
voltage is irrelevant; the fuse is blowing due to excessive current, not low voltage.
Q4: In a 12V DC system schematic, Terminal A shows 12.6V when measured to ground,
but Terminal B (downstream on the same circuit) shows 0V. The wiring between A and B
is intact. What component is most likely located between these terminals?
● A. A fuse that has blown open.
● B. A circuit breaker that has tripped.
● C. A switch that is in the OFF position or a relay that is not energized. [CORRECT]
● D. A resistor that has failed.
Correct Answer: C
Rationale: C is correct. Circuit Analysis: Voltage present at point A but not at point B on
the same conductor indicates an open circuit between the two points. Since the wiring
is intact, the open is a control device—either a manual switch turned OFF or an
automatic relay/solenoid that is not receiving its control signal to close. This is
common in lighting circuits with wall switches or pump circuits with pressure switches.
Why others are wrong: (A) & (B) If a fuse were blown or breaker tripped, Terminal A
, would also read 0V (no voltage past the protection device). (D) A failed resistor would
typically show some voltage, not zero, unless it failed open completely (rare).
Q5: When installing a new lithium iron phosphate (LiFePO4) battery bank in place of
lead-acid batteries, what critical system modification must be verified?
● A. The 12V fuses must be replaced with 24V rated fuses.
● B. The converter/charger must be compatible with lithium charging profiles
(14.2-14.6V absorption). [CORRECT]
● C. The battery cables must be doubled in length.
● D. The inverter must be removed from the system.
Correct Answer: B
Rationale: B is correct. 2026 Lithium Battery Standards: LiFePO4 batteries require a
higher charging voltage (14.2-14.6V absorption) compared to lead-acid (13.6-14.4V).
Standard RV converters designed for lead-acid will undercharge lithium batteries,
resulting in only 70-80% capacity. The converter must either be lithium-compatible or
replaced with a lithium-specific model. Why others are wrong: (A) Voltage rating of
fuses is not the issue; amperage ratings remain based on wire size. (C) Cable length
should be minimized, not increased, to reduce voltage drop. (D) Inverters work fine with
lithium and often perform better due to stable voltage output.
Q6: A technician measures 13.6V at the converter output terminals but only 12.8V at the
battery terminals with a 10A load applied. The cables are properly sized. What is the
most likely cause?
● A. The converter is faulty and producing low voltage.
● B. There is excessive resistance in the charging circuit connections (loose,
corroded, or undersized). [CORRECT]
● C. The battery is sulfated and cannot accept full charge.
● D. The multimeter is malfunctioning.
Recreational Vehicle Service Technician Certification
Version A & Version B | 100 Questions Each | Verified Correct
Answers
VERSION A (100 Questions)
System: Electrical (12V DC)
Q1: A customer complains that their 12V overhead lights are very dim when the RV is
not plugged into shore power, but brighten when plugged in. The battery is new. What is
the most likely cause?
● A. A failed 120V circuit breaker.
● B. A faulty converter that is not properly charging the battery or supplying 12V
power. [CORRECT]
● C. A blown 12V fuse for the lighting circuit.
● D. A failed inverter.
Correct Answer: B
Rationale: B is correct. The converter has two main functions: 1) Charge the battery
when on shore power, and 2) Supply 12V DC power to the RV's 12V systems when on
shore power, bypassing the battery. Dim lights on battery alone suggest the battery is
undercharged. Lights brightening on shore power indicates the converter is supplying
12V directly, but its charging circuit is likely faulty, leaving the battery depleted. Why
others are wrong: (A) A 120V breaker wouldn't affect 12V lights on battery. (C) A blown
,fuse would cause no lights, not dim lights. (D) An inverter converts DC to AC, not related
to 12V lights.
Q2: When testing a deep-cycle RV battery with a digital multimeter, a technician reads
12.2V at rest (no load, not charging). What does this voltage indicate about the battery's
state of charge?
● A. The battery is fully charged at 100%.
● B. The battery is approximately 50% charged and should be recharged.
[CORRECT]
● C. The battery is completely discharged at 0%.
● D. The battery is overcharged and damaged.
Correct Answer: B
Rationale: B is correct. Battery Voltage vs. State of Charge (Resting): 12.6V+ = 100%
charged; 12.4V = 75%; 12.2V = 50%; 12.0V = 25%; 11.8V or less = discharged. A reading
of 12.2V indicates the battery is at approximately 50% state of charge, which is the
minimum recommended level before recharging to prevent sulfation and permanent
capacity loss. Why others are wrong: (A) 12.6V or higher indicates full charge. (C) 0%
would read approximately 10.5V or lower. (D) Overcharge would show elevated voltage
immediately after charging (13.0V+) but would not damage the resting voltage reading
in this manner.
Q3: A technician is troubleshooting a 12V circuit where the fuse keeps blowing
immediately upon replacement. What is the safest and most logical first step in
diagnosis?
● A. Replace the fuse with a higher amperage rating to see if it holds.
● B. Disconnect the load and use a multimeter to check for a short to ground in the
wiring. [CORRECT]
● C. Wrap the fuse in aluminum foil to bypass it temporarily.
, ● D. Check the battery voltage first.
Correct Answer: B
Rationale: B is correct. NFPA 1192 Safety Standard & Diagnostic Procedure: An
immediately blowing fuse indicates a direct short circuit (excessive current flow). The
proper procedure is to: 1) Remove power (disconnect battery or shore power following
lock-out/tag-out), 2) Disconnect the load, 3) Use a digital multimeter set to continuity or
resistance to check for short-to-ground in the wiring harness. This isolates whether the
short is in the wiring or the component. Why others are wrong: (A) & (C) Violate safety
codes—never upsize fuses or bypass protection; this creates fire hazards. (D) Battery
voltage is irrelevant; the fuse is blowing due to excessive current, not low voltage.
Q4: In a 12V DC system schematic, Terminal A shows 12.6V when measured to ground,
but Terminal B (downstream on the same circuit) shows 0V. The wiring between A and B
is intact. What component is most likely located between these terminals?
● A. A fuse that has blown open.
● B. A circuit breaker that has tripped.
● C. A switch that is in the OFF position or a relay that is not energized. [CORRECT]
● D. A resistor that has failed.
Correct Answer: C
Rationale: C is correct. Circuit Analysis: Voltage present at point A but not at point B on
the same conductor indicates an open circuit between the two points. Since the wiring
is intact, the open is a control device—either a manual switch turned OFF or an
automatic relay/solenoid that is not receiving its control signal to close. This is
common in lighting circuits with wall switches or pump circuits with pressure switches.
Why others are wrong: (A) & (B) If a fuse were blown or breaker tripped, Terminal A
, would also read 0V (no voltage past the protection device). (D) A failed resistor would
typically show some voltage, not zero, unless it failed open completely (rare).
Q5: When installing a new lithium iron phosphate (LiFePO4) battery bank in place of
lead-acid batteries, what critical system modification must be verified?
● A. The 12V fuses must be replaced with 24V rated fuses.
● B. The converter/charger must be compatible with lithium charging profiles
(14.2-14.6V absorption). [CORRECT]
● C. The battery cables must be doubled in length.
● D. The inverter must be removed from the system.
Correct Answer: B
Rationale: B is correct. 2026 Lithium Battery Standards: LiFePO4 batteries require a
higher charging voltage (14.2-14.6V absorption) compared to lead-acid (13.6-14.4V).
Standard RV converters designed for lead-acid will undercharge lithium batteries,
resulting in only 70-80% capacity. The converter must either be lithium-compatible or
replaced with a lithium-specific model. Why others are wrong: (A) Voltage rating of
fuses is not the issue; amperage ratings remain based on wire size. (C) Cable length
should be minimized, not increased, to reduce voltage drop. (D) Inverters work fine with
lithium and often perform better due to stable voltage output.
Q6: A technician measures 13.6V at the converter output terminals but only 12.8V at the
battery terminals with a 10A load applied. The cables are properly sized. What is the
most likely cause?
● A. The converter is faulty and producing low voltage.
● B. There is excessive resistance in the charging circuit connections (loose,
corroded, or undersized). [CORRECT]
● C. The battery is sulfated and cannot accept full charge.
● D. The multimeter is malfunctioning.
