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The warning light wasn’t due to the hack.

I decided to take a long ride 95 miles round trip and the warning light went away not to return. No idea and haven’t looked again at the logs.

I’ve still got to reset my sprocket size and tyre diameter so will be connecting the bike up soon.

I would think the charge tank would use the OBC to close the contactor and to increase your charging by 1.4 KW.  But I do not have the charge tank on my Zeros, so I cannot be sure how it works.

But it seems to me the internal connection to put AC voltage on the OBC is broken somewhere.  But if it doesn't work that way, there is a way to turn on the contactor with the key out with a modification.    I did such to both my Zeros.

You can find that info. starting here.
-Don-  Reno, NV

Thanks Don,
I wrote this reply earlier when I had some questions but have edited it as I bit the bullet and wired it up.
Success !! my charge tank now charges without a powered plug to the obc.

I have wired in a momentary switch to use while I switch on and off the ignition.

The only issue I have discovered is if the EVSE does not negociate a change , I can set the max Amps from my EVSE and if it is below 30A it leave the bike with the dash battery with 00:00 charge time and I need to pull the Low Power B+ fuse.
I'm going to try it out at a commercial charge point later.

Sof ar so good, thank you for pointing me at that hack.

I have designed and 3d printed a replacement side panel just below the seat to hold the switch.

So I turned on the bike with the throttle disconnected and then armed the bike , with side stand up and I don’t get the dash error.
It now stays alive enough to download the logs.

Pre disconnecting the throttle I got this on the first turn on of the day
07745     04/29/2023 12:44:00   Sevcon CAN Link Up   
 07746     04/29/2023 12:44:00   SEVCON CAN EMCY Frame      Error Code: 0x1000, Error Reg: 0x01 Sevcon Error Code: 0x4884, Data: 0x00 0x00 0x00 0xa0 0x02 , Sequence Fault
 07747     04/29/2023 12:44:00   DEBUG: Sevcon Contactor Drive ON.   
 07748     04/29/2023 12:44:00   Module 00                  vmod: 102.115 maxsys: 102.115 minsys: 102.115 diff: 0.000 vcap: 88.125 prechg: 86%

Then after disconnecting the throttle I get this
04/29/2023 12:56:14   Sevcon Turned On   
 07900     04/29/2023 12:56:15   OBD: key cycle pending   
 07901     04/29/2023 12:56:15   Sevcon CAN Link Up   
 07902     04/29/2023 12:56:15   DEBUG: Sevcon Contactor Drive ON.   
 07903     04/29/2023 12:56:15   Module 00                  vmod: 102.107 maxsys: 102.107 minsys: 102.107 diff: 0.000 vcap: 88.187 prechg: 86%

Which I assume is normal from earlier logs.

So I think I need a new throttle.

All was good and then it was not.

I noticed that the rear tail light was on with the key removed and not charging , so I pulled the fuse on the side and parked it up for a few week.
Now I’ve come to look at it and I get a pulsing power image on the dash and if I could the flashing error I get a 2-3 which is CAN error.

However when I turn on the bike on and connect via Bluetooth to download the logs it turns off at about 12%.

Any ideas?