Alarm was rigger by instlling a new battery. Can't get it to stop. We no longer have remote to reset alarm.

find a shop
ask them to put the wiring back to day 1 stock oem condition.
or learn how.
buy the service manual and do it. DIY
only 2ways to regress any alien alarm on a car.

1. Unlock the car manually. If the alarm remote is not working, use the key directly. Often times opening up the door will stop the alarm. If the driver's side door won't unlock, try the passenger door.

2
Turn on your car. Put the key in the ignition, and turn the car on. If this doesn't turn off the alarm, try turning on and off the dashboard lights a few times without revving up the engine.
3
Utilize common tricks. Factory car alarms have some simple reset protocols to help turn off an alarm. Most of the tricks rely on using the key in the door; simply put, a lot of factory car alarms have a door sensor, so working with the door might be the go-to for a quick fix.
Put the key in the driver's door and turn it twice to the right, then twice to the left. Then insert your key into the ignition and start the car.
Turn the key into the unlock position and hold it for two seconds before opening the door.

4
Disconnect the battery. If the alarm is still sounding after the initial troubleshooting, you'll want to silence the siren as quickly as possible. Car alarms rely on the electronic component of the vehicle, and disconnecting the battery should both silence the siren and reset your alarm. Open up the hood, locate the battery, and with a wrench, remove the negative terminal. Then reconnect it after a minute has passed.
If it is more easily accessible you can also unplug the wiring harness that connects to the car's horn or siren. If the horn or siren gets unplugged it can no longer make noise.

5
Reset the alarm unit. Locate the alarm and transmitter system; refer to your owner's manual for the exact location. Hit the reset switch or turn it off and on.

6
Remove the alarm fuse. This should both silence and take the alarm out of commission until the fuse is replaced. Find the alarm fuse in the fuse box. Remove it, and put the fuse in a plastic bag. You can store it in your glove compartment for safe keeping.
If you cannot locate the alarm fuse right away, remove fuses to see if the alarm will stop. Doing this will not cause damage to the car, but make sure you return the fuses after you've determined they are not for the alarm.
Some car alarms, when tampered with, prevent a car from starting as an anti-theft function. If you remove the fuse and cannot start the vehicle, you will have to take the car to a mechanic or dealer.

7
Press the "panic" or buttons on your keychain remote to stop the alarm. Because the "panic" button can sound the car alarm, it can also stop it. Pressing "unlock" or the "trunk" button can stop the car alarm because it disarms the car's security system.

8
Seek a mechanic if problems persist. If none these reset methods work, try speaking with a mechanic or dealer. If they can recognize the issues over the phone, the fix might be simple. However, further diagnosis might be needed in person.

https://www.wikihow.com/Disconnect-a-Car-Battery

The dealer usually has a contractor that deals with remote entry systems on scheduled days. Most places like carmax do too for about $75-100. Try carmax first. I'll bet you'll save money.

The battery cannot be dead if the alarm is going off. however it might be to low to start the car and cause this situation. I would use the alarm remote to reset the alarm or un-hook the ground cable on the battery. Or charge the battery.

If you need further help, reach me via phone at https://www.6ya.com/expert/john_411a7faba7ce8217

Is the remote battery dead? Or have you recently changed the battery in the remote?

If the first it needs a new battery.
If second. You may have taken too long to change the battery and the remote is no longer programmed to the car. you will need to take it and the car to it's dealership and have them reset it. It will cost.

:)

I couldn't turn off the security alarm on my 1999 Pathfinder as I replaced the battery,
Solution: I read the solution here to disconnect the positive cable, open the driver's door, insert the key, then reconnected the positive cable, while honking, I turn the key to the left, to the right and to the left again while the door is still open. The honking stopped. Then I started the truck without a problem. Thank you for the hint.

i have a 2002 vw cabrio and won't start after i took out the battery everbody is telling me that anti-theft is lock mode how do i rest it so i can start my car

If it is a Ford Factory Alarm it should have key FOBS (remotes). Just press the unlock button 2 times and that should stop it. Alarm systems no matter what brand always have remotes. If you have remotes pressing the unlock should disarm the system 99 times out of 100. If that doesn't work then either the battery in the remote is dead, or the remote is broken. Hope this helps. Cobra :-)

take it back