compreesor question

ok so my compressors crapped out on me tonight  when i turn the switch to my compressors on i can hear the relay kick on but the compressors wont come on   did i burn up both compressors at the same time or the relay   also all of a sudden about a week ago i started loosing air pressure in the tank when the truck is off   could that have anything to do with the problem at all   maybe a bad pressure switch?
 
 
thanks for any help

If two compressors went out at the exact same time I would suspect your relay first. Try powering them direct and see if they run, then you will know if they are dead or if its the relay or other wiring. If you all of the sudden started losing tank pressure over time it may be a bad check valve allowing air to drain back thru one of your compressors. If you are running Viair compressors and leader hoses I would look there first. If that checks out it will be time to break out the soapy water and do some testing of your fittings and conections.