I recently bought a 1981 r107 380sl and the fuel relay has been giving me issues. the relay ticks when the car is on and i am assuming this is frying it. I have been through two relays so far (the first was the one the car came with, second was a reproduction I bought) and it looks like the third, which is an original, is on the way out. Does anyone know what's could be causing/how to fix this?