A Deep Dive into the 2005-2012 Mitsubishi Galant Alternator
Everything a Galant owner needs to know before replacing their alternator.
- Before replacing the whole alternator, check the B+ terminal post for damage per TSB-06-16-001; a simple repair kit may be all you need.
- Oil leaks from the valve cover gasket are a known cause of repeat alternator failure on the Galant; inspect and fix any leaks to protect the new part.
- The replacement procedure differs between the 2.4L (manual tensioner) and 3.8L (automatic tensioner) engines.
- A simple multimeter test can confirm if the alternator is bad: voltage should be 13.5-14.5V with the engine running.
Is Your Galant's Alternator Failing?
An alternator rarely fails without giving some warning signs. If you notice any of these symptoms with your 2005-2012 Galant, it's time to inspect the charging system.
- Battery Warning Light: The most direct sign is the battery-shaped light on your dashboard. This means the car's voltage has dropped because the alternator isn't charging properly.
- Dimming or Flickering Lights: Headlights and interior lights that flicker, dim, or get brighter when you rev the engine are a classic symptom. This shows the alternator can't provide steady power.
- Whining or Grinding Noises: A high-pitched whine or a grinding sound from the engine bay that changes with engine speed often points to bad bearings inside the alternator. A squealing noise could be a loose belt.
- Slow or Malfunctioning Electronics: If your power windows are slow, the radio cuts out, or other accessories act up, it could be due to insufficient power from the alternator.
- Difficulty Starting or Stalling: A weak alternator can't recharge the battery, leading to a no-start condition (often with a rapid clicking sound). The engine might also stall while driving if the alternator fails completely.
A Common Issue to Check First: TSB-06-16-001
Before you buy a whole new alternator, check the main power connection on your current one. Mitsubishi issued a Technical Service Bulletin (TSB) for the 2005+ Galant regarding a damaged B+ terminal post. A loose nut can cause this post to overheat and break. Instead of replacing the entire unit, you might only need a simple repair kit (part number MD632008) to fix it.
Choosing the Right Aftermarket Alternator
When replacing the alternator on your Galant, you have several options. The original part was likely made by Denso, a top-tier supplier. Aftermarket parts offer a range of quality and price points.
OEM-Grade (Best Quality):
- Denso: As the likely original equipment manufacturer, a new or remanufactured Denso alternator is a reliable choice. They are known for high efficiency and durability, and their remanufactured units undergo a rigorous testing process to meet original standards.
Quality Aftermarket (Good Value):
- Remy: Remy offers both new and remanufactured alternators. While some users have had positive, long-lasting experiences, others have reported premature failures, such as bearing noise. They can be a good budget-friendly option, but quality can be inconsistent.
- MPA (Motorcar Parts of America): MPA is a large supplier that produces the Quality-Built (QB) brand. They emphasize their strict, end-of-line testing for both their new and remanufactured units to ensure performance.
Budget-Friendly (Use with Caution):
- BBB Industries: This company is a major player in the remanufacturing world and owns the Remy aftermarket brand. They supply parts for many auto part store brands. Quality is generally considered decent for the price, but as with many remanufactured parts, there is a higher chance of getting a faulty unit out of the box compared to an OEM-grade part.
Protect Your New Alternator
A very common reason for repeated alternator failure on the Mitsubishi Galant is oil leaking from the valve cover gasket. The oil drips directly onto the alternator, damaging its internal components. When you replace your alternator, inspect the valve cover gasket above it for any signs of leaks and replace it if necessary to protect your new part.
🎬 Watch: How to replace a leaking valve cover gasketCost of Replacing a Galant Alternator
The total cost depends on the part you choose and whether you do the work yourself or hire a professional.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $153.87 - $231.89 |
| Shop Labor | $118 - $268 |
| Total Professional Replacement | $438 - $702 |
Frequently Asked Questions
Is it hard to replace the alternator on a 2005-2012 Galant?
The difficulty depends on your engine. For the 2.4L 4-cylinder, it's a moderately easy job involving a manual belt tensioner. The 3.8L V6 is a bit tighter and uses a spring-loaded automatic tensioner. For a DIYer with the right tools, it's a feasible weekend project that takes about 2 hours. You'll typically need to access it from the passenger side, sometimes requiring wheel removal.
🎬 See this step-by-step alternator replacement walkthroughWas there a recall on the alternator for this Galant?
No, there have been no specific recalls issued by the NHTSA for the alternator on the 2005-2012 Mitsubishi Galant.
Can I drive my Galant with a bad alternator?
It is not recommended. A failing alternator will not recharge the battery, and your car will only run until the battery's reserve power is depleted. This could leave you stranded without warning when the car stalls.
How do I know if it's the alternator or just a bad battery?
A simple test with a multimeter can tell you. With the engine off, a healthy battery should read about 12.6 volts. Start the engine. The voltage should rise to between 13.5 and 14.5 volts. If the voltage doesn't rise or drops when you turn on accessories like headlights, the alternator is likely faulty.
🎬 Watch: How to test your alternator with a multimeterHelpful Videos
Technical Specifications
OEM Part Numbers: 1800A053 A3TG2192 A3TG4891 MN158593
Amperage varies by model and engine (typically 110A). The 2.4L I4 engine uses a manual belt tensioner system integrated with the alternator bracket. The 3.8L V6 uses an automatic spring-loaded belt tensioner.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mitsubishi Galant: