Our crystal balls have become very cloudy, due to the recent elections. You are not giving us much info to help you. We have no idea how old this unit is, which engine it has, or if you have done anything to solve the problem besides changing the relay? With out unit model and serial numbers, plus all engine numbers everyone here will just be guessing. My first guess is that there Is a loose or dirty connection. My second guess is that you don’t have the proper size battery. If it is a single cylinder engine, the battery should have a minimum of 300 CCA. If you have a twin, the battery should have a minimum of 350 CCA. If you want more help please provide more info.