Second door bell connection

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Yes that works thanks! The second chime does a full ding dong but the original does less of a ding dong. So does this mean I need a more powerful transformer?
 
Put your multimeter across the transformer set to AC VOLTS.
What voltage is shown
1 without the button pressed
2 with the button pressed
 
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Here is a pic. It's the same reading on both chimes. When the button is pressed down, the reading drops to 0 and then back up to 15 when button is released.

Sounds like you was measuring across the 2 wires to the bell push, instead of the two left hand terminals, test voltage at the 2 left points shown in freddos picture
 
Here's the output I think it's the right setting without button pressed. When it's pressed the reading goes up and down so didn't take a pic of that. Unless I have the setting wrong on multi meter?
 
Unpressed ...
 

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This is like pulling teeth… I cannot believe there have been 57 posts about a couple of door bells….

So………….. 10.3v is that without the button pressed?
if so
what is the reading when the button is pressed??
 

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