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ok, truck was at dealer for a couple weeks and finally have a "resolution". I just bought this truck used from said dealer in June with 71k miles on it. Drove it without issues for 3 months and 7k miles before this happened. After all their testing, etc. They came back with; 1 - Wired...

Got the truck to the dealer yesterday by pulling and charging the aux battery to 12+V. reconnected and started right up as it should. Will update this thread once a resolution since it appears multiple people have had or are having similar issues. Appreciate the technology as well, just...

All are essentially 0 with the exception of the one indicated above at 12.8. Some will fluctuate from 0 to .01-.02. But that’s it.

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This one here at the bottom - stated input as that is where the output from the battery isolator seemed to enter.

all are 0 or the low aux battery voltage. When aux battery was reading 3.2, those 3 were all showing 3.2. With the aux battery out, all are 0.

Block

Exactly.

also, where I'm getting the 0 reading, if I have the battery in and it's low voltage, it reads the same voltage there that the aux battery reads.

Measured at the battery, 2nd terminal on the positive post, Input of the isolator, output of the isolator, then the output of the block showing the .01. But to the main fuse block there it is still showing proper voltage. Aux battery is still not connected.

Yeah, have the meter. I'll go out and test input and output of those wires in the next few minutes and share some pics of what I'm seeing.

So just ran and tested it again quick. When I pull the aux battery, I get nothing. No lights, can't start, no dash lights. Truly just dead. In the fuse block, I get 12.7 volts on the mine line in and the other 4 side outputs are at essentially 0. When I had the aux battery hooked up, those...

I have not played/checked the isolator. Is it obvious when looking at the battery where it's at? Like I shared at the beginning too. When the aux battery was reading 3.2v - the live side of Fuse 1 was also 3.2v, whereas the input on the main fuse block was 12.8, as was the battery as well...

Charging the main battery did nothing to the aux battery. Left charger on main overnight and aux was still reading 3.2v. Pulled and charged it and within a couple hours, was up to 12v. put it back in, started right up. Then would drain. Main battery is not draining. Just the aux battery. If...

Checked all of them. Couldn't find anything blown, many were loose/not pushed in all the way. So pushed them all in. Disconnected or with the low voltage, truck will not start. Lights don't work, walk up sentry doesn't work, no dash lights, it's truly a brick without the aux battery charged.

Yes. If I pull the small battery, charge it back up to 12v, it works great and as it should. No issues starting, etc. Both electric and ICE. Starts runs, drives normal. But just letting it sit, the small battery drains and then nothing again.

That battery is fine and strong 12.8v. But it is like a dead brick without that small battery voltage higher. Nothing works, can't jump, can't do anything.

Replaced main battery first before even knowing of the small 2nd battery. It is reading around 12.7v - 12.8v consistently.

Bit of an update here. Picked up a new under seat battery. Read 12v out of of the box. Put it in the truck and this is the progress of it when installed. 12.01 noon installed Friday 11.76 - 4pm - Friday 11.4 - 640pm 11.05 -11pm 10.57 - 10am - Saturday 3.2 volts - 630pm 2.58 volts - 9am -...

Well, got it started now that the charger has been running. Full of faults for every system popped up. pulled off the charger and it was up to 11 volts. Will keep it on the slow charger for next couple of hours. Any thoughts if all these alarms will clear on the next cycle or will I need to get...