Say Mark, the rad installation is looking good.
Here's the situation. With the oem wiring, when you turn the ignition switch to off, the fans & ignition are disconnected from the battery, but they remain connected to one another. The fan motors act as generators & generate enough current to keep the engine running.
If you install fan relays as detailed in the drawing below, this situation will not exist & the diodes shall not be needed.
cowboy from hell
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