Electrical 12v power source for fan relay.

I have my Contour fan almost completed. Thanks to the guys who helped me get it nearly 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.

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Thanks guys.... I'll need to check that wiring for power. I have an aftermarket dash gauge setup. No warning lights anymore, so I'll need to first check to make sure that there is still power within that wiring. Check it with a meter sound right? Anyone know which color wire is the (+) one?