Ignition woes

Well i cleaned the the bulk head terminals from the engine compartment side. They didnt seem to bad. I noticed some of the pins would pull out of the plug while cleaning fairly easy. So i just put them back in and made sure they would come out easy. Tried to fire it up and it would start then die as soon as i let off the key. So pulled the connectors back apart checked them again put them back in . Tried to fire it up and back to firing when letting off the key. I wasnt sure about what setting on my voltmeter to be on to check for how much draw. When i checked the brown wire on the the starter relay it read 9 volts while cranking? We have a big cruise and show this weekend and its not looking good on making it.