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On another note, I had my electrician stop by on Wednesday to take a look at my house and garage to see about installing a L2 charger.

He also looked at what would be needed to install a generator inlet plug and manual transfer switch so I can power my house with the Lightning during power outages. I'm very excited about the prospect of this. Will be a game changer since I don't have a generator or home backup batteries currently.
 
So yesterday while running some errands I passed a charger with a Rivian attached but then a pair of jumper cables attached to what seems to be its trailer hitch and/or real close. The other end was attached to ice car next to charger. Why?
 
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So yesterday while running some errands I passed a charger with a Rivian attached but then a pair of jumper cables attached to what seems to be its trailer hitch and/or real close. The other end was attached to ice car next to charger. Why?
That’s weird.
 
So yesterday while running some errands I passed a charger with a Rivian attached but then a pair of jumper cables attached to what seems to be its trailer hitch and/or real close. The other end was attached to ice car next to charger. Why?
I don’t know for sure what they were doing… But I can speculate.

The low-voltage (12V) battery for the Rivian is under the frunk. So the 12V battery is somewhat inaccessible to jumper cables while the vehicle is charging.

If the ICE car had a low battery, they may have been charging the ICE car’s battery via the trailer wiring of the Rivian. It’s a slow way to do things since the maximum current through the 7-pin hot is about 30 Amps. The ICE car was probably drawing more like 7-10 amps. They couldn’t do a boost to give the car a start, it would have to be a trickle charge.
 
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So in doing some research there is a two wire point in which the Rivians 12v system can be jumped to allow for charging port to be opened if totally dead. But also states it’s a one way system so you can’t jump an ice car. So I’m guessing either while on charger that becomes hot or somebody’s hoping🤣
 
That’s weird.
The truck was probably on 0% SOC (Zero juice on the main battery ) AND had lost the charge on the 12V. They were likely charging the 12 volt through the (+) and (-) at the trailer hitch to get enough energy to likely pop the Frunk open, so they could then directly jump the 12V to then enable a charging session.

Even if the truck is plugged in to DCFC charger, I'm guessing nothing was happening until the 12V was charged and the truck was awakened and came back online.

This is one way to get some juice back to the 12V (through the port next to the trailer hitch)

Screenshot 2025-10-20 at 5.33.48 PM.png


They probably didn't have the tools to remove the panel to release the frunk manually (another guess):


Screenshot 2025-10-20 at 5.37.59 PM.png
 
But how do you know ahead of time when planning a route? ABRP & Plug Share aren’t obvious in this matter.

While most chargers have credit card readers or tap-to-pay, if you are going on a long trip I would not rely on that. During my recent trip there were several chargers with credit card readers that were broken or off-line. There were even a couple of instances where the blue-tooth readers were not working, so I could not use the "wave the phone in front of the sticker" to activate a charger. But in all cases I was able to use the phone app to start them. Also, to be fair, one of the two stations I stopped at that had non-functional credit card readers was scheduled to be fixed the next day.

If you are planning a long trip, I would use a route planner (like ABRP) configured with a subset of charging vendors and plan the route using those charging vendors. That will provide the route that has good EV charging coverage. Then install and configure the apps on your phone for those chargers before you leave on the trip.

To add one more point. I used ABRP to plan my three day trip, and even recorded the stops. So I had a good plan for travel distances and stopping points. But I did not actually use that for most of the trip. My car (Hyundai Ioniq 5) has built in navigation that lets me configure preferred charging stations and driving preferences (I prefer highways and more frequent/shorter stops) just like ABRP. I can just enter my final destination in the car's navigation and it will create a route that includes charging stops. It provides directions while driving and will even precondition my battery when I get close to the charging stop. It also updates the directions in real time based on traffic and charger availability. Most EVs have a similar capability.

So, planning ahead for charging isn't strictly necessary. It is mainly a peace-of-mind thing I do to make sure I have options.