FS PA-300in Crown Victoria

tgo · Post by **tgo** » Mon Feb 28, 2005 6:58 am

Not Motorola, but vehicle install related: Installing PA-300 siren in Ford Crown Victoria. Broke hown ground wire from horn relay and spliced into PA-300 as usual. Problem: Horn ring and cruise control share a ground; turn on cruise, siren sounds.
Any of you suggest a solution? additional relay, etc.? Thanks.

Adam · Post by **Adam** » Mon Feb 28, 2005 7:44 am

haha.. thats great for a hidden siren button, and undercover operations.

I think you've just got your polarity reversed.

PriorityOne · Post by **PriorityOne** » Mon Feb 28, 2005 8:38 am

LOL! but just think, you can set the cruise control for 80 mph and with the siren blarin' you wont even have to slow down or adjust your setting. I thought the CV's were positive for horn ring though.

tgo · Post by **tgo** » Mon Feb 28, 2005 2:56 pm

Think I am following the line of these two posts: polarity may be reversed on horn ring vs horn wires. Will do some switching and see waht happens.
Thanks, guys.

Jay G. · Post by **Jay G.** » Mon Feb 28, 2005 6:22 pm

this has always been a problem with crown vics. Only way I know of to bypass this is to go right from the horn itself using a relay.... I know it's not perfect, but it works!