2020 Ram ProMaster – Fuse Box Diagram & Amperage

Quick Answer

The 2020 Ram ProMaster has fuse boxes located in three primary locations:

• Under-hood: Located near the battery on the driver's side.
• Instrument Panel (Dash): Located behind a cover on the driver's side, typically near the kick panel.
• Rear Cargo Area (Integrated Power Module): Located on the driver's side in the rear cargo area.

Always verify the specific fuse layout and amperage ratings against the fuse diagram printed on the inside of your fuse box cover, as configurations can vary slightly by trim level and options.

Under-hood Fuse Box (Power Distribution Center - PDC)

This fuse box contains high-current fuses and relays for major vehicle systems.

Relay Locations (Under-hood):

• R1: Starter Relay
• R2: Fuel Pump Relay
• R3: HVAC Blower Relay
• R4: A/C Clutch Relay
• R5: High Beam Headlight Relay
• R6: Low Beam Headlight Relay

Instrument Panel Fuse Box (IPT Fuse Block)

This fuse box manages power to various interior accessories and controls.

Rear Cargo Area Fuse Box (Integrated Power Module - IPM)

This module often handles power for rear lighting, additional power outlets, and trailer connections.

Relay Locations (Rear Cargo Area):

• RR1: Rear 12V Power Outlet Relay
• RR2: Trailer Tow Park Lamps Relay

How to Test a Fuse

Testing a fuse is a straightforward process. You'll need a fuse puller (usually found in the fuse box cover) and a multimeter or a fuse tester.

1. Locate the fuse: Refer to the diagrams above and your vehicle's fuse box cover to find the suspect fuse.
2. Remove the fuse: Use the fuse puller to carefully remove the fuse from its slot. Never use metal tools like pliers or screwdrivers, as this could short-circuit the system.
3. Visual inspection: Hold the fuse up to the light. If the metal wire (filament) inside is broken or melted, the fuse is blown and needs replacement.
4. Test with a multimeter (for less obvious breaks):
   • Set your multimeter to the continuity setting (usually an audible beep or an ohm symbol).
   • Touch the probes to the metal contact points on top of the fuse. If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If it shows "OL" (open loop) or no reading, the fuse is blown.
5. Test with a fuse tester: Insert the fuse into the tester. A light on the tester will illuminate if the fuse is good.
6. Replace the fuse: If blown, replace it with a new fuse of the exact same amperage rating and type. Using a fuse with a higher amperage can lead to electrical system damage or fire.

Common Blown Fuses on This Vehicle

While fuses can blow for many reasons, some are more common than others due to the nature of the circuits they protect or the components they power. On the 2020 Ram ProMaster, pay attention to these areas:

• Cigar Lighter / 12V Power Outlets (F32, R01): These fuses are common culprits due to overloading from charging multiple devices or using high-power accessories. If your phone charger or air compressor stops working, check these first.
• Blower Motor (F03): The blower motor can draw significant current, especially on higher settings, or if it