I have my Contour fan almost finished. Is there a way to check to see if my coolant overflow wiring is a good 12v non-constant source? I thonk checking it with a meter with the key "on" should work? I'm not sure that the starter solenoid will be a good choice. I read someplace that if the car gets warm, that starter solenoid 12v source can be flakey. If someone has another recommendation for this power, let me know. I don't have A.C. or heat in this car and don't know what other 12v source would work. Thanks.