Alternator, Starter & A/C Compressor Guides

Technical guides for alternators, starters and A/C compressors — diagnosing a fault and narrowing it to the right part, replacing it, reading an OE number, and how freight and minimum order quantities actually work. Written for workshops, dealers and distributors.

Why an $80 Quote Becomes $100: A Landed-Cost Guide for 12V Alternator Buyers

Two suppliers quote the same 12V alternator for the same vehicle. One is $15 a unit cheaper — $1,500 across 100 units. The decision looks obvious. It stops looking obvious three months after the container arrives, when the returns, the reshipments and the warranty conversations have all been invoiced. The lower quote assumed a lower total cost. It rarely is. What follows is the arithmetic a distributor needs before signing: what the unit really costs landed, what a cheaper programme can absorb in after-sales cost before it stops being cheaper, and how to compare two quotes on the same basis.

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In this guide

  • Key points
  • 1. Why two quotes cannot be compared on unit price
  • 2. Building the landed cost
  • 3. Branded or unbranded: which programme costs less?
  • 4. How much after-sales cost the cheaper option can absorb
  • 5. After landed cost, calculate cost per sellable unit
  • 6. Comparing supplier quotes fairly
  • 8. Closing

Does an Alternator Charge the Battery?

Yes — the alternator charges the battery whenever the engine runs. How the circuit works, why it replaced the DC generator, and how long a battery lasts alone.

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Rebuild or Remanufactured Alternator?

Rebuild renews the parts that failed; remanufactured means every wear component is replaced and the unit is tested. Which route fits the unit on your bench.

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Alternator Pulley Types: Solid, OAD, Clutch

Solid, decoupler (OAD) or one-way clutch: how to tell the three alternator pulley types apart, match the grooves, and what fitting the wrong type does.

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