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to Ram Forum. 
make that the Gen5 section, Gen4 doesn't have eTorque
That "pump" sound that goes on and off is probably the vacuum booster pump that on the front of the engine.
fuse-box.info
X2. However, there is no need to replace the fuses. Fuses either work or they are blown. Blown fuses are open, they don't cause things to be stuck on. Pull them individually (KEEP TRACK OF WHERE THEY GO!) until the noise is gone. Most likely you've got a relay stuck, but going through the fuses would narrow down what is stuck on. You could also pull relays one at a time until the noise is gone, that might be the sticky relay. If not a relay, look for a stuck switch or damaged wiring. Somebody mentioned it could be the vacuum booster, does anyone know if it runs automatically to keep the vacuum boost so you can depress the brake to start? Maybe there's a vacuum leak and it's running indefinitely to maintain vacuum.Wow! That's pretty crazy.
Does this cycling noise just continue indefinitely?
If it does, I would start pulling all the fuses, one at a time and replace them as you go.
With luck, you will eventually identify the source of this noise after pulling the associated fuse.
I would start with the higher value fuses and continue working down in Ampere rating until it stops.
You could make a small black mark on each fuse with a Penman black felt tip marker or something similar, after replacement.
Once you identify the associated fuse, the fuse # should identify the device.
Another option is to use a mechanics stethoscope to identify the noise source.
A long screwdriver pressed up to your ear might be a good substitute, provided the noise isn't too deep in the engine bay.
And, View attachment 534231 to Ram Forum.
PS; This has been posted in the 3rd gen section and should be in the 4th gen.
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It is still at the dealership. They told me yesterday that they charged the battery and they are leaving it sit. I was told they are checking the battery periodically looking for a draw on the battery. no answer to the issue yet.Are you referring to the brake booster pump?
Why/how would it be running with the key off state?
Sometimes the brake pedal on my truck gets hard, before starting. If I understand this correctly, it's because the brake vacuum leaks down after the truck is off for a period of time.
If this is the brake vacuum pump, pulling fuse #F33 from the panel in the engine bay should silence this noise.
Fuse Box Diagram RAM 1500 / Dodge Ram (2019-2021..)
Fuse box diagrams (location and assignment of electrical fuses and relays) RAM 1500 / Dodge Ram (2019, 2020, 2021..)
I hope that you're removing the negative battery lead and connecting a battery minder or other low current charger (2 Amp) to the battery until this fault is corrected.
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The vacuum pump is tied into the master cylinder vacuum port along with what comes off the engine. It's common for the vacuum to bleed down when a vehicle isn't running.
THIS as Crash has said. And that Dealership should have been able to detect immediately with that noise. Heck, just place your hand on different areas till you feel what is running. THAT pump is readily identifiable and big. All IMHO.
Sorry, apparently I misunderstood your line:
I did offer to show the serviceman the video. He seemed to think it wasn’t important to look at. He said the technician would run tests. I took it to a salesman and sent it to him via text. He went and showed it to the technician. Still no word from them today. I too think it is not effective to leave the truck sit and wait for a draw on the battery. It took me three weeks to drain the battery when I was driving it. I live in a small town and that is the only RAM dealership. The only other one is about two hours away. I don’t feel safe driving it there at this point.
