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How do you stop the burglar alarm from going off when battery dies in a 91 GMC pickup?

There's no way to reliably stop a burglar alarm triggered by a dying battery in a 1991 GMC pickup *without* addressing the dead battery. The alarm system is likely tied directly to the vehicle's electrical system, and a low battery voltage is interpreted as a potential break-in or malfunction.

Here's what you should do:

1. Jump Start the Truck: This is the most straightforward solution. Jump starting the truck will restore power to the alarm system, and it should stop. Make sure to follow proper jump-starting procedures to avoid damaging the vehicle's electronics.

2. Locate the Alarm's Control Panel (if it exists): Some older systems have a separate control panel with an override or disable function. This is unlikely, but check the owner's manual or the truck's interior for a small keypad or switch.

3. Disconnect the Battery (last resort): If jump-starting fails and you can't find an override, disconnecting the negative (-) battery terminal is the only surefire way to silence the alarm. However, this will also disable other essential systems and leave your truck vulnerable. Reconnect the battery as soon as possible after addressing the dead battery's cause.

Important Considerations:

* Persistent Alarm: If the alarm continues to sound even after jump-starting, there might be a fault within the alarm system itself. This would require professional diagnosis and repair.

* Battery Cause: Find out *why* your battery is dead. A dead battery is a symptom, not a cause. It could be a parasitic drain (something drawing power even when the truck is off), a bad alternator, or a corroded battery terminal. Ignoring this will lead to repeated problems.

* Professional Help: If you're uncomfortable working with car batteries or electrical systems, call a roadside assistance service or a qualified mechanic.

In short, don't try any tricks to bypass the alarm; fix the dead battery, and the alarm should stop.