2022 Limited parasitic draw

[brillmtb1]

So I have a 2017 and have the same parasitic drain on my limited with a screen that isnt the big one like yours so I think these trucks do have strange drains for some reason. I thought there was a heater in the diesel filter but not sure. I add a noco 5a trickle as well.

 

[AH64ID]

You have two diesel fuel heaters, one in each filter.

 

[brillmtb1]

Do the diesel fuel heaters turn on when its cold and the truck is off?

 

[AH64ID]

Do the diesel fuel heaters turn on when its cold and the truck is off?

They do not, only when the ignition is on.

 

[brillmtb1]

So I wonder where the draw comes from in these trucks someone should have figured this out by now. We measured shortly after truck turned off then waited and measured and something was drawing then shut down. I didnt repeat this recently when I left town for 4 days at 18 degrees and came back and my truck would not start. Charged it overnight, load tested fine and put back in my trickle charger.

 

[Ozymandias]

Dealer time, let them figure out what's wrong. Because there is NO parasitic draw built into it, if it does it's broken somewhere. Park it for 4 weeks at least is the industry standard.

 

[sag2]

Correctly stated above, you should get weeks sitting and it will still start. If not, something is staying awake. There is no one reason, so there isn't an easy fix. It can be any module, so in order to diagnose you need to measure the draw using an amp meter and once you have confirmed excessive draw you pull fuses until the draw goes away. It's fairly easy if the draw is there all the time, but if it's intermittent it is very difficult. Each model year and trim level is going to be a bit different, but in the last 10 years you should see no more than 50mA after 30 minutes. On the newer trucks it will time out the modules quicker.

 

[SVick]

This is something interesting I have found when I had a dead battery after the truck was sitting for a couple weeks. I have a 2020 Limited with the aux switches and used the #1switch for my air bags with an electric onboard compressor kit. I found that the compressor will come on when the air gets low to keep it automatically filled if the switch is left on and the truck is off. If I turn off the switch, all is off, so I guess the aux switch is energized all the time, I guess that is normal.

 

[AH64ID]

This is something interesting I have found when I had a dead battery after the truck was sitting for a couple weeks. I have a 2020 Limited with the aux switches and used the #1switch for my air bags with an electric onboard compressor kit. I found that the compressor will come on when the air gets low to keep it automatically filled if the switch is left on and the truck is off. If I turn off the switch, all is off, so I guess the aux switch is energized all the time, I guess that is normal.

You can change the aux switch to only be on when the ignition is on using the commercial settings menu on the EVIC.

 

[SVick]

You can change the aux switch to only be on when the ignition is on using the commercial settings menu on the EVIC.

I looked for it before but did not see where. Is it in the giant oversized radio display somewhere?

 

[AH64ID]

I looked for it before but did not see where. Is it in the giant oversized radio display somewhere?

No, it’s on the instrument cluster. Press up or down on the steering wheel until commercial settings comes up. Your PIN should be 0000.

 

[SVick]

No, it’s on the instrument cluster. Press up or down on the steering wheel until commercial settings comes up. Your PIN should be 0000.

Ok, I’ll look there. Thanks for the info.

 

[SSchang]

This is something interesting I have found when I had a dead battery after the truck was sitting for a couple weeks. I have a 2020 Limited with the aux switches and used the #1switch for my air bags with an electric onboard compressor kit. I found that the compressor will come on when the air gets low to keep it automatically filled if the switch is left on and the truck is off. If I turn off the switch, all is off, so I guess the aux switch is energized all the time, I guess that is normal.

I hooked up my AMP power running boards to one of my aux switches in my 2022 Ram. Since I wanted the boards to deploy when I opened the door (Ignition Off), I programmed the switch to battery not ignition. What I didn't know, when an aux switch is programmed that way, it engages a small relay in the aux switch control box under the hood. Two trips to the dealer and a new passenger side battery later, I figured out the relay was draining the battery. The truck sits a lot in the winter.

The strange thing was the driver side battery stayed charged, only the passenger side battery would drain. I thought they were connected together?