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How to Wire a Briggs & Stratton Alternator

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Briggs & Stratton has produced lawn-mower engines and small engines in the U.S. for decades. Briggs & Stratton uses various alternators to produce electricity and charge batteries, depending on the voltage and ampere requirements of the engine and battery. However, wiring a Briggs & Stratton alternator is an easy task. Most use two terminals: some only use one and, best of all, the wires simply plug into terminal sockets on the alternator.

Put on a pair of gloves to protect your hands while wiring your Briggs & Stratton alternator. Open the battery box cover.

Remove the red positive cable from the positive battery terminal using a wrench. Remove the black negative cable from the negative battery terminal. The terminals are clearly marked “+” and “-“ respectively.

  • Briggs & Stratton has produced lawn-mower engines and small engines in the U.S. for decades.
  • Put on a pair of gloves to protect your hands while wiring your Briggs & Stratton alternator.

Locate the Briggs & Stratton alternator attached to the engine block. Look on the back to determine how many terminals it has: one or two. If it has two, one is the ground and is labeled “Gnd” and the other terminal connects a wire to the rectifier to change alternating current (AC) into direct current (DC) and is labeled “AC.” If it has one it means the alternating is self-grounding and no connection is required as it’s grounded directly onto the metal engine block.

Find the cable, or cables, near the alternator. If the alternator has two terminals, one cable is black for negative and the other red for positive. Both have plastic moulded plugs on the end and can only be connected to the correct terminal. If the alternator has one terminal, then locate the red cable.

  • Locate the Briggs & Stratton alternator attached to the engine block.
  • If the alternator has two terminals, one cable is black for negative and the other red for positive.

Insert the plug on the end of the black cable into the terminal socket labeled “Gnd”, if it has one. Insert the plug on the end of the red wire into the terminal socket labeled “AC.”

Reconnect the black negative battery cable to the negative battery terminal using a wrench. Reconnect the red positive battery cable onto the positive battery terminal using a wrench. Close the battery box cover.

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