X2....at the minimum it will prevent future corrosion at any open connection. I also add dielectric grease on connections that I splice. I will squeeze the grease into the shrink tubing prior to shrinking. Most of it will squeeze out but what remains will percent corrosion.
With respect to changing your solder less connectors, the old one more than likely had a bit of corrosion that was causing intermittent power, intermittent contact. Rule of thumb on electrical connections that are exposed to the elements, like most on motorcycles is to clean your contacts prior to making new connections. The way I do this is to purchase a can of electrical contact cleaner, spray the contact point then with a small jewellers file, clean the mating points of the solder-less connectors. After making your connections,with the battery disconnected is to take a resistance reading with your multimeter on either side of the contact to ensure that you have no resistance. Meter should read 0 ohms. Anything other than that means there is resistance which will cause problems. In that case clean the contact again. If you do this at every connection you touch chances are you will have no headaches when you turn the power on. It takes a little longer to perform your task but should alleviate problems. If the connection is good, like Hanso recommended, use dielectric grease.
Glad to see you found the fault..cheers