I searched, I swear I did. If this has been covered, I did not see it.

We went to dinner last night, did not touch anything to make the battery go dead. No switches or anything else to make it drain all night. This morning, the battery was dead. The fender guard lights were on, is the only way we noticed it. Thought it was odd, but didn't think much of it. Wife was driving it (it's her vehicle) the day before and all the warning lights on the dash came on, then went back off. Only happened once, and it was the first time. Now I think maybe its connected.

Have a battery tender on, and its trickle charging. The rear tail lights started a weird flashing sequence, an hour later it changed to what is in the video. Which to me just looking at it, seems like its going from low to high. Perhaps signifying that it is charging. I can find no documentation on it however. Battery tender after 3 hours shows the lowest of charges still, flashing red. Took it off charging, and nothing comes on. Anyone have any thoughts?

 

Can you jump start it with another vehicle? Your video comes through very pixelated, I can't make out what's going on with the rear lights but that doesn't sound right regardless. Is the headlights switch in the off position?

 

Almost looks like the alarm is trying to arm itself.

 

I have a Ford "Mustang" Mach-E, all electric vehicle, '68 Mustang, and motorcycle. My '68 could jump start it, its very loud though and late here with kids in bed. I can try that tomorrow, threw it on the tender thinking it would just charge it up. The Mach-E has a battery, but seems annoyingly difficult and not ready to go there yet.

The lights are off, I checked and fiddled with the switch. We didn't change the lights yesterday, they're set to auto. Was day light when we came home, everything seemed normal. Turned off the vehicle and came inside. Just like any other time. Did not have anything extra on.

 

How did you connect the trickle charger?

 

just confirming the trickle charger is for an AGM battery -- not lead acid ....

 

I connected it as the instruction say. The negative to a post near the positive. Tried moving the negative to another location just to check.

This is the charger I have;
Woke up this morning and the lights have a different pattern, with the headlights flashing for an instant now too. And the tail lights doing a different, shorter dance. Going to call the dealership today and see what they say.

 

Yep, just make sure the mode button is pressed so the AGM 12V is lit.

I killed some AGM batteries by not doing so -- ugghh.

Good luck on your trip to the dealer.

 

It is, the second option. I took it off the charger, obviously not working and the red light still flashing showing the lowest charge.

I don't understand what happened, hopefully get it figured out soon. Had it about 6 months, 5k miles. No issues prior to this.

 

Just to confirm, here is the charging situation. This is how it is been since the start, yesterday afternoon about 5.