This diode board is a component of the electrical system on the parent combine. It houses the diodes that rectify alternating current from the generator into direct current for the machine’s control modules and battery charging. A failed diode allows AC ripple into the DC bus, which can cause erratic sensor readings and premature failure of electronic control units. The board is manufactured to the original electrical specifications, ensuring the correct forward-voltage drop and reverse-blocking characteristics for the charging circuit.