Lithium lifepo4 not charging

[ShadowsPapa]

If it doesn't cycle, the alternator will overheat and be permanently damaged. Hopefully, you haven't burned up your alternator.

You aren't going to burn up the alternator in these unless you short the thing and then the system will scream at you with a voltage out of range message.

These use the PCM to regulate the voltage.
IF the new batteries have a built-in BMS, then it should work. My gut suggests something happened in the swap.
These also do best with new batteries installed FULLY CHARGED and the IBS reset. And if you don't use the IBS, that will lead to other errors and issues.

I did buy an adjustable external voltage regulator that bypasses the computers smart regulator.

Not necessary if the new batteries have BMS built into the battery itself, and you haven't blown something in the process of switching things around.
I'd do like already suggested - put the AGM batteries back and see how it works. If it doesn't work then, you can go from there troubleshooting.

Alternator output goes to N7 on the high current fuse array.
And since all of the other terminals, save for N1, are connected more or less directly to N7, you should have the same voltage at each terminal - if one is drastically different, then you likely have a blown fuse.

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[Kyleax1]

Update: swapped back to the AGM's and voltmeter is reading 14.3 and dash 14.5

 

[JTdiRtyD]

They said their system is just an on/off switch basically and their kit shouldn't affect whether or not it charges. It doesnt care or know whaybtype.of battery is in it. He suggested I check the voltage at the alternator fuse and at the battery to make sure charge is actually making it to the battery and that its possible the battery bms is not allowing the battery to charge because the input charge is too low.

This is very possible. As an example, my LiTime lifepo4 has a charge voltage of 14.4 =/-.2v. What are the specs for the battery? I tried to Google search for them but can't find anything on that brand (if T.E.T. is he brand).

 

[Kyleax1]

This is very possible. As an example, my LiTime lifepo4 has a charge voltage of 14.4 =/-.2v. What are the specs for the battery? I tried to Google search for them but can't find anything on that brand (if T.E.T. is he brand).

14.2-14.6 I haven't been able to find documentation online. The only thing I have is the booklet that came with the batteries and the emails I have had with the manufacturer (email address was in the booklet).
Gemini chat says a dc to dc charger will resolve this, but at this point its not even worth it. I have a different brand lifepo4 coming for the sierra so im interested in finding out if it gives me the sane problems.

 

[JTdiRtyD]

14.2-14.6 I haven't been able to find documentation online. The only thing I have is the booklet that came with the batteries and the emails I have had with the manufacturer (email address was in the booklet).
Gemini chat says a dc to dc charger will resolve this, but at this point its not even worth it. I have a different brand lifepo4 coming for the sierra so im interested in finding out if it gives me the sane problems.

AI chat is likely looking at it wrong. Its probably assuming these batteries are for a second system like a house battery, not a starter battery. A DC-DC charger is what you need for a house battery system.

TBH, for what you've described I would do a house battery for it all anyways. Leave the AGM to run your vehicle as intended and leave it at that, then install a house batt system that charges through a DC-DC while the vehicle is running. It will be less stress on your alt, less stress on your starter battery, and (probably) more and cleaner power for your lights and system.

Ultimately my guess is the battery BMS is causing conflicts with the PCM and alt, and it's not detecting a high enough alternator output to allow charging. My Tacoma needed PCM configuration changes made to output a higher charge in order to run a lithium as a starter battery.

 

[Kyleax1]

I talked with BrandX and they were very helpful. Basically I need an HP tuner kit along with it to be programmed to over ride some of the stock sensors to allow the lithium to charge.

 

[ecidiego]

omg is it even worth it?

 

[Kyleax1]

omg is it even worth it?

Idk, are the mods worth it? Probably not, but its fun.

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[ShadowsPapa]

I talked with BrandX and they were very helpful. Basically I need an HP tuner kit along with it to be programmed to over ride some of the stock sensors to allow the lithium to charge.

Naw, that's THEIR version of things.
There's a fellow here who has been running lithium batteries for over a year - no troubles.
It's just their version of stuff that's problematic.
And depending on what version of things you have - "tuning" may not be possible or practical.

I'd ditch that brand for what Andy is running.

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