AC DC adapter help please

[ETAF]

which unit - the goodmans or the one you found
Not sure what it would go through the charging to get to the batteries - maybe a loss there if a cheap circuit
so 6V is low to start with

 

[JohnW2]

on the 7.5 setting I am getting 7.55V

It clearly is producing the correct voltages when off-load.

I can not get anything across the battery springs - charge switch was on

That's surprising. With the 'charge switch on, voltage must be getting to inserted batteries (were they present), otherwise they obviously wouldn't get charged. Have you tried measuring between all possible pairs of 'springs'?

If there really is no voltage getting to any of the battery connections, the only think I can think of is that some 'clever' electronics are only allowing voltage to get to the battery connections if they sense that a battery is present!

 

[aveatry]

It clearly is producing the correct voltages when off-load.

That's surprising. With the 'charge switch on, voltage must be getting to inserted batteries (were they present), otherwise they obviously wouldn't get charged. Have you tried measuring between all possible pairs of 'springs'?

If there really is no voltage getting to any of the battery connections, the only think I can think of is that some 'clever' electronics are only allowing voltage to get to the battery connections if they sense that a battery is present!

Yes I tried one end on the spring down that end covered by the radio plastic case and then the other probe on the spring at the other end. I have never tried charging battery in it so it may never of worked

 

[aveatry]

which unit - the goodmans or the one you found
Not sure what it would go through the charging to get to the batteries - maybe a loss there if a cheap circuit
so 6V is low to start with

Testing the one I found.
Just tested the goodmans one and get 8.48V