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this has a siren under the hood ?
did you know it had an alarm on this truck ? no remotes to shut it off i am assuming ?
did you add this aftermarket alarm ? is there small red blinking light or LED light bulb in the dash ?
can you stuff a rag in the siren so its not that loud and connect the battery then lock and unlock the drivers door from the outside will that shut it off ?
if the dealer said they installed it and unlocking it from the outside of the front doors with the keys then call the dealer and ask them where the off switch is for it
there usually is a small switch or bulletin under the drivers side of the dash or kick panel to shut it off
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