Class system help

[Mcolabella]

Had recently taken the control unit two local electronic shop and had solder joints repair other than the digital display missing some of the elements the system would work function properly but recently when I hit the button to raise or lower the air the relays are clicking but the compressor is not turning on I took a quick measurement with the voltage meter and it seems like I'm only getting 6 volts at the compressor any thoughts

[videoarizona]

Had recently taken the control unit two local electronic shop and had solder joints repair other than the digital display missing some of the elements the system would work function properly but recently when I hit the button to raise or lower the air the relays are clicking but the compressor is not turning on I took a quick measurement with the voltage meter and it seems like I'm only getting 6 volts at the compressor any thoughts

 

Yep, Check for dirty or corroded connections...