[Pacco]

Installing a Spal fan relay harness. Not by any stretch an electrician. Have one question. According to the directions the red attaches to the fan positive wire. Looking at the wiring that I have, it is a ford pig tail with 3 wires coming from the fan to a connector. A black wire, looks to be a brown wire with a red stripe and another brown wire with a yellow stripe. Which wire would be considered the positive wire? The red striped or yellow striped? Both lit my tester light when the key was turned on. The fan does not have any name or markings on it. And it is a puller fan. Thanks!!!!!!!!