I have a heavy 14.4V 1.5A heavy battery charger I would like to use to charge my car battery (over time, monitored for heat in a well ventilated area).
When I plug the battery to the charger as is, I believe it turns off as the led doesn't turn on and the Voltage I read is 10.8 which is what the battery is at. When I measure the charger on it's own I get 13V.
Can someone help me modify it to make it work? I'm comfertable soldering and researching if you don't feel like giving a specific answer :). Images of the transformer and circuit:
Thanks in advance for any efforts :)
Edit - I sketched a diagram of the circuit on tinyCad, here it is:
I noticed that there is an earth connection for the battery, but only 2 connections to the wall socket. I don't get how it would be earthed, but perhaps the third connection is needed to turn it on? It is directly connected to one of the switch's 4 'legs'.