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can i replace a 6 volt bell box with a 12 volt bell box?

I have a itec horizon alarm but the bell has a 6 volt battery.
I want to replace it with a 12 volt box would this be easy to do or would the whole system have to be changed, i know there are tamper switches on pir's and the control box as well.
I currently have a number 7 fault which i think is from the bell box as the battery is about 20 years old and only showing 2.5 volts.
many thanks for any help.
ian, January 2011
tell you what mate,get a new system,20 years old???
and you want to fit a new bell box??? your nuts

gts, January 2011
link Click here to see other fixes for ITEC Horizon.