Aux battery bypass. Can I run start/stop with H7 main battery?

[RHRT]

I fully removed my Aux battery, pulled the F42 fuse, disconnected everything including the negative cable up to the main battery terminal. Working just fine for over a month now.

I didn't want to leave the Aux battery connected to anything so its out of the vehicle entirely.

I did the same thing this evening. I had the”Start/Stop” service icon come on and from reading on this forum, decided to fully remove the Aux battery, tape up both Aux battery cables, stuff both back in the Aux box, put in Autozone Platinum H7, pulled the 42 fuse, started the JTW, and everything came up perfectly! And no more error icon for the ESS! I did charge the new battery prior to install with Noco Genius 10. I did this procedure via the PDC removal to access the Aux battery compartment.

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[Lost1wing]

I did the same thing this evening. I had the”Start/Stop” service icon come on and from reading on this forum, decided to fully remove the Aux battery, tape up both Aux battery cables, stuff both back in the Aux box, put in Autozone Platinum H7, pulled the 42 fuse, started the JTW, and everything came up perfectly! And no more error icon for the ESS! I did charge the new battery prior to install with Noco Genius 10. I did this procedure via the PDC removal to access the Aux battery compartment.

You hopefully will not see an issue, especially if you have ESS disabled from activating. Letting ESS operate could cause a repeated low voltage situation for you electronics.

 

[RHRT]

You hopefully will not see an issue, especially if you have ESS disabled from activating. Letting ESS operate could cause a repeated low voltage situation for you electronics.

Thanks for that info Lostwing. Good to know.
The ESS is disabled via Tazer. I do occasionally perform a full reboot(x2) of the Tazer once every 4 months or so. A couple of times noticed the license plate lights were on while in reverse. The reboot restored the lights off while in reverse.

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