It's fixed! - It was a blown fuse in the end!

 

When I first tested the fuses - I did not remove them from the panel!! (YES! I am a doughnut!)

 

I think ..I caused the fuse to blow - as I cut the bell wire - whilst the system was still powered on.

 

Thank you again all!

 

 

1 hour ago, virdi said:

It's fixed! - It was a blown fuse in the end!

 

When I first tested the fuses - I did not remove them from the panel!! (YES! I am a doughnut!)

 

I think ..I caused the fuse to blow - as I cut the bell wire - whilst the system was still powered on.

 

Thank you again all!

 

 

Good job 

 

And probably needed the battery anyway 

Thank you!

 

yes and battery replaced.

If the PIR LED is dead as well, that points more at the AUX rail itself than just a tired battery. With the panel powered, measure DC right across the AUX + and 0V terminals, then again with the Texecom 1E hold connected. Those sounders sit on the hold permanently, so a weak PSU or a high-resistance joint can sag under load even when an open-circuit battery still reads 12.6V.

Also worth double-checking the 1E wiring against the old bell box. Hold and trigger polarity swapped is pretty common after a sounder swap and can leave AUX looking unhappy.