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Had this issue recently on my car, as I understand it the original head unit has a felt sheet that prevents circuit meeting when alarm wire installed, ensures if parked with hood (English) down and someone tries to slide unit out the wire earths and alarm sounds. In my case simply disconnected and insulated wire and all good. No alarm feature on radio but heh park with roof up!!!
Don't leave as it is or if cage meets with radio the system will earth and sound alarm. Not good at 4 am as I can attest, neighbours not best pleased.
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