The generator has fault detection capability built into the regulator. BCM will supply 12 volts to regulator over circuit No. 225 (L terminal) and monitor field voltage of generator by using a PWM signal over circuit No. 23 (F terminal).

Code B410 will set if there is either an open or short to ground on circuit Nos. 23 and 225, a belt break, or if an undervoltage or overvoltage condition exists. If there is a short to ground on circuit No. 225, the "BATTERY NO CHARGE" telltale light will illuminate on the IPC.

NOTE: Test numbers refer to test numbers on diagnostic chart.

BCM input code BI51 displays generator voltage as "HI" or "LO" depending on voltage state at BCM. Normally with ignition on, engine off, circuit No. 225 will be pulled low by generator and BI51 will read "LO".
Checks if "LO" reading is due to circuit No. 225 or generator. If reading changes from "LO" to "HI" when generator is disconnected, circuit No. 225 and BCM are okay.
Determines if fault is due to BCM or circuit No. 225.
BCM data code BD51 displays amount of generator field activity. Under normal conditions, a reading below 7 percent would indicate a fault in field circuit or BCM.
Removing generator connector will determine if fault is due to generator or an open in circuit No. 225 including BCM and interface connector.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Code B410 - Charging System Circuit: Notes

Use the Manual With the Right Hardware

When to See a Mechanic

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