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The BHC code in question also indicates that the BHC switch supply voltage is low. If the alternator is working and the batteries are decent then the problem is most likely a connection or a ground issue. We have a great deal of trouble with the ground side of the circuit on sprayers. It is best to start by checking the ground buss bar in the battery compartment. Next check the F12 fuse which is the switch power fuse for the BHC controller. If the fuse checks good swap the K16 relay with another known good relay. If you have a volt meter test for power at the F12 fuse, with the engine running you should have at least 13 volts at the fuse.
Power goes from the K16 relay, out back of the cab and back to the SRC/BHC controller mounted behind the solution tank just behind the rear axle. Check any and all ground wires going to frame ground as eyelet style connectors.
If you are in need of further assistance simply let me know what you are finding based on the instructions above and I will gladly assist you with further diagnostics as needed.