bought a car recently with a cobra alarm fitted, but no siren. The alarm seems to work fine, arms disarms, flashes when a door is opened or the alarm is triggered by the sensors etc, just no siren.
Anyway, there are 3 wires, one red, one black and one blue all blanked off next to a mount which is siren sized in the engine bay.
I have bought a back up battery siren with 4 wires on, red positive, black ground, blue neg trigger, white pos trigger.
The wires in the car are red = live, checked with multimeter, black = earth, and the blue one has a constant signal running through it (not 12v) whether the alarm is armed or dissarmed.
When I connect the live to live, ground to ground, and the pos trigger to this blue wire the alarm sounds constantly whether armed or dissarmed. If i connect the neg trigger to it it seems to work at first, chirps when i arm or dissarm, but after about 30 seconds starts to chirp repeatedly, but the chirp isn't a solid sound, a bit muffled.
Please help, its probably something simple.
blue wire could be the tigger for a hood pinswitch. try only using the red and black wires from the siren to the red and black wires from the alarm. negative trigger wire will always show voltage, around 4-6 volts sometimes even more. im almost positive thats what the blue wire is.
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gcorrea
did you try get a cobra siren. the blue could also be multiplex
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Why oh Why didn't i take the blue pill
Darren Power
earth the ground from the siren directyl to the engine bay.
conenct the power wire to the live wire.
im thinkin you need to conenct the white to black, and the bloue to blue. so Pos trigger-to black, neg trigger-to blue.
give that a try. and let us know