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Central ND | It's either an NCV or an AIM harness.
Start by pulling all the connections from the center mast out, clean connections, spray with corrosion-x before plugging back in.
Do you still have the original outer harnesses with the terminators that are exposed or have you already replaced them with the newer style with fully molded terminators?
Is it always on once boom or is it random across both booms?
it could also be a battery connection for the power harness, there are 3 self-resetting circuit breakers on the harness to the battery, underneath and near the radiator where it crosses, check those for corrosion, compare voltage there to the high power connection on the parallel link arm.
Edited by jwalterus 1/22/2026 08:52
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Case 4440 sprayer shows “NCV low voltage”
