Specifications

ELECTRICAL SYSTEMS

Alternators

Alternator System Diagnosis

The following list is provided to help diagnose alternator system problems.

COMPLAINT POSSIBLE CAUSES

Battery not charging

• Engine RPM too low.

• Inline fuse “blown” (if equipped).

• Defective battery.

• Loose, pinched, or corroded battery ground leads.

• Loose, pinched, or corroded battery charge leads.

• Open, shorted, or grounded wires between output connector and battery.

• Defective diode (open or shorted).

• Defective or improperly grounded regulator-rectifier.

• Diode installed incorrectly (reversed).

• Damaged battery (shorted battery cells).

• Excessive current draw from accessories.

• Low magnetic flux or damaged alternator magnets.

Battery overcharged

• Severe battery vibration (missing or broken tie-down straps).

• Battery rate of charge not matched to alternator output.

• Damaged battery (shorted battery cells).

• Defective regulator.

• One OHM resistor shorted or grounded (Tri-Circuit system only).

Headlamps not working

• Inline fuse “blown” (if equipped).

• Defective headlamps.

• Loose or corroded wires.

• Open, shorted or grounded wires between output connector and headlamps.

• Light switch defective.

• Defective diode Tri-Circuit system (open or shorted – white output lead side).

• Low magnetic flux or damaged alternator magnets.

Electric clutch not working

(Tri-Circuit Alternator)

• Inline fuse “blown” (if equipped).

• Loose or corroded wires.

• Open, shorted or grounded wires between output connector and electric clutch.

• Defective diode (open or shorted - red output lead side).

NOTE: Battery will also not charge.

• Defective electric clutch switch.

• Open, shorted or grounded clutch circuit.

• Low magnetic flux or damaged alternator magnets.

For Briggs & Stratton Discount Parts Call 606-678-9623 or 606-561-4983