I’ve eight 12 volt dosing Pumps that I want to connect to ferduino controller
I’ve two Relays boards with eight 12 Volt channels 
But when I connect correctly to arduino and only 
Take some test code Relays Board flashes but in Relays nothing happens
I put Relays 8 to pwm8 port 
Then +/- from Arduino Mega into Relays Board 
Then I connect external 12 volt power adapter (+) to the pump (+)
And (-) to middle screw Relays 8 
And the (-) from the pump to the connect screw on Relays 8
Start test upload but the pump do nothing 
Whats wrong
            
                        
                            
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