How to Light LED2 Only When Solar Panel Is Charging 12V Car Battery Without Power Loss?

(Third try as image is failing to load. Can anyone offer help on that ?)
I have a small solar panel for maintaining my 12V car battery. (Circuit below.)
The panel supplies about 75mA to the battery in full sunlight.
I want to avoid wasting power, so LED1 and LED2 will take only about 2mA each.
LED1 shows the panel is producing volts, but I want a circuit that will light LED2 only when the panel is charging the battery.
I’m trying to find a way, when current is flowing, to use the voltage across DI to turn on TR1.
How can I light charging indicator LED2 without significantly reducing the voltage or current going to the battery ?
Please modify the circuit freely to accomplish this.
Many thanks for any help you can give.

With single diode You can solve your problem. See the pic you can understand. see the connection. the Diode is connected at positive Terminal.

Hi Siraj, thanks for your reply.
Unfortunately, I can't see what is connected to which in that picture.
Please would you post a simple circuit diagram ?
Many thanks, Frank.

At last, here is my partial circuit diagram, the system won't accept BMPs, has to be JPG.

Hey Mr Webmaster, how about putting a note to that effect beside the "Attach a Picture or File:" box ? It would save people a lot of problems ! Thanks (in hope) !

Find the attachment

Hi Siraj, thanks for that.

However, my situation is that the solar panel plugs into the car lighter socket, and I want the LED to light only when the car battery is receiving current, so that I can immediately see if the plug has fallen loose.

(It's a good idea to draw the series resistor for the LED in your circuit, as some people viewing the forum may not know enough to include one if they try out the circuit.)