Sounds like something is wired wrong or broken to me.

Maybe upload photos of each end showing the connections and markings? 

I cannot get access to the bell at the moment, however i have not changed the connections there, I labelled where it was wired into the original panel. (note i need to reduce the exposed wires in the picture) 

 

B+: Red

B- : Black 

BA : yellow

STB- : Green 

STB+: White

BT: Blue 

Did you change anything other than the bell? I would start by removing the strobe and bell (yellow and white wires) then see if arming still blows the fuse then put them back one at a time to see whats causing the problem. My money is on strobe 

 

 

 

 

 

 

 

 

I replaced the panel and added 2 new PIR's, The external sounder / strobe is the same. I will try that, however i need to buy more fuses (this will be interesting at the moment!) 

1 hour ago, Guest said:

I cannot get access to the bell at the moment, however i have not changed the connections there, I labelled where it was wired into the original panel. (note i need to reduce the exposed wires in the picture) 

 

B+: Red

B- : Black 

BA : yellow

STB- : Green 

STB+: White

BT: Blue 

 

you've wired the strobe wrong...

Which way should it be? 

stb on the alarm panel is 0v applied when the alarm tell the strobe to flash

 

green in stb

white in b+

 

 

1 hour ago, MrHappy said:

 

you've wired the strobe wrong...

 

2 hours ago, PeterJames said:

My money is on strobe 

 

 

 

 

 

 

 

 

 

@PeterJames since its a bankholiday I thought I might do a helpful post,

 

you know, mix it up a bit