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Electrical PA system truble


FOX

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i Have a PA system in my truck and the other day it stoped working, i finally got to looking at it and found a blown fuse in it. when i replaced the fuse, and turned on the siren, it souinded like a machine gun (should sound like a cop siren) and yes i know its illigal to drive down the road with this on, but i got the system becasue of the PA system. when i jumped the fuse with a wrench,,, the siren worked fine, sounded normal, so what should i do. there are 3 wires going to the box. Positive( from battery directly to the unit,,,)

a accesory wire that is hookd up to my radio, and a negative... along with the 2 speaker wires,,, any help on what i could do to fix this problem???? larger fuse(amp) i think it was a 20amp fuse? thanks guys!

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