Digi-Star ST 3400 - Manual (Page 36)

Installation
Caution
A control box is typically required for proper connection from the ST3400 to
the seed tender. Improper wiring may damage the ST3400 or seed tender
controls such as the radio.
Cable Connection
Auger Control Wiring
For standard On/Off seed tenders, refer to D3967, 408000 control box
installation.
For variable throttle seed tenders, refer to D3977, 408221, and 408853
control box installation
Pin To Auger Control Box
1 Red +Terminal
2 Black -Terminal
3 Orange Relay Out (to solenoid)
4 Blue Control Input
32 ST3400 User’s Manual D3943 Rev C