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My plug is turning black on my Nelson 8424 Irrigation Controller Panel. Should I be concerned.

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I have installed a Hunter psr22 pump start relay and connected it to a Hunter src irrigation controller and when I cycle the irrigation controller to manual all stations it will not start the pump. There...

So the mv and c are supplying power to the transformer/relay and out of it, but the pump won't start until the relay is forced.
I'm thinking the relay contacts are oxidized, and need to be cleaned. When they have oxidation, current goes up, and voltage might appear ok. If any start capacitors are in the circuit, they can be faulty, breaking down under a load, while reading ok. I haven't heard of any caps in these systems, but just in case.
The following blog may help you- it's about different controller situations:
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Looks like it could be microprocessor lockup. It's quite a process, but here's what they say is the fix:
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