1996 subaru outback brake lights flashing when battery is reconnected.

Remote Starter
https://www.reddit.com/r/subaru/comments/e47ve2/blinking_blue_light_on_windshield/

.https://www.google.com/search?q=flashing+blue+light+on+back+of+rearview+mirror+on+a+2018+Subaru+Outback

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Remove battery from key less remote, if the problem with flashing lights and battery drain is solved then replace remote.

sounds like you need the remote either a new battery or it needs re syncing with your vehicle , follow this link for advice
Subaru Keyless Entry Security Alarm Immobilizer Key Remote Start...

You put the battery or batteries in upside down, wrong polarity.

If you are talking about the Key FOB, most Autozone, Advance, and Oreilys have a remote tester and batteries for the FOB.

Please rate my info.

unlock then lock with the key in the door you might need the remote alot of locksmith shops that sell key fobs could help you with that

disconnect battery for 10 minutes.

Regulator is bad or alternator is going out.

yes it's most likely a alternator problem,usually the internal diode bridge breaks causing all lights you mentioned to come on,if this happens at a idle open the hood and remove green connector on alt.if lights go out you've found the problem

Subaru Outback Legacy Flashing
Q. I have a 1996 Subaru Outback Legacy AWD manual transmission. the hazards flash when I turn the car off. I tried to reset the system by pushing the little black button under the drivers' side dash but it won't reset the system. I had problems with the brakes so I did not drive it for about two months and when I tried to start the car the battery was dead.
Now the brakes are fixed but the hazards won't quit flashing and the guy who repaired the car said I needed to reset the system by pushing the little black button. And I don't know if I should have it looked at, or change the battery, or if it is something very simple I can fix by my self.
Thank you very much,
Patrick
A. Patrick, you are the third person in the last two days that has come to me with this same exact problem under the same conditions. As of now I don't have any concrete information on this, but I believe the problem to be in the alarm system.
I believe the battery being disconnected or dying does something to the Anti-theft and Alarm System module and having a Subaru dealer reset the system will correct it.
If you do this and it works, please, let me know and I will pass the information on to the others.
Added 11/7/2003
Dear Mr. Ciulla,
I read your Q&A titled "Subaru Outback Legacy Flashing". I recently had the same problem on my 1996 2.5 liter Subaru Legacy Outback and your response is correct but I can give you a little more detail on what worked for me to stop the light flashing (which occurs sometimes if the battery had been dead):
There is a black reset button under the I/P near the anti-theft module.

1. Turn ignition on
2. Hold button 20+ seconds (door locks will lock/unlock 3 times)
3. Turn ignition off

This also resets the key FOB so as step 2.5 you should also press the "lock" button on the key FOB before releasing the black reset button (door locks will lock/unlock one more time--do this with each key FOB you own). That's all!
The questioner in your Q&A said he tried the reset button; I suspect he either didn't turn the ignition on/off or didn't hold it in for over 20 seconds.
PS... pulling the door lock fuse will stop it temporarily if you can't get the above to work and have to take it to the dealer
Regards,
John

Photo Courtesy John Spieth ©2003
Additional Information provided courtesy of ALLDATA