A Guide to Replacing the Alternator on Your 1980-1987 Buick Riviera
Keep your classic Riviera's electrical system healthy by choosing the right new aftermarket alternator.
- The 1980-1987 Riviera uses an external voltage regulator; test it before replacing the entire alternator.
- For best reliability, choose a new alternator from a premium brand like ACDelco or Bosch.
- Upgrading from a stock 78-amp alternator to an 85-amp or higher unit is a common and beneficial modification.
- Diagnose the issue with a multimeter before buying parts; a running engine should show 13.7-14.7 volts at the battery.
Symptoms of a Failing Alternator
An alternator rarely fails without warning. If you notice any of these signs with your Buick Riviera, it's time to test the charging system. Ignoring them can leave you stranded.
- Dimming or Flickering Lights: Headlights and dashboard lights may flicker, or dim and brighten as you change engine RPM. This is a classic sign of an alternator struggling to produce consistent voltage.
- 'GEN' or Battery Warning Light: The dashboard warning light is a direct indicator that the system voltage has dropped, and the alternator is no longer charging the battery effectively.
- Whining or Grinding Noises: A high-pitched whine or a lower growling sound from the engine bay that changes with engine speed usually points to failing bearings inside the alternator.
- Weak or Dead Battery: If you find yourself needing to jump-start your Riviera frequently, the alternator is a likely culprit. It can't recharge the battery, causing it to drain even while driving.
Choosing the Right Aftermarket Alternator
For a classic car like the 1980-1987 Riviera, new Original Equipment (OEM) parts are generally not available. Your choice is between new aftermarket parts and remanufactured units. Aftermarket parts are made by companies other than the original manufacturer, while remanufactured parts are used OEM cores that have been rebuilt with new service components.
Pro Tip: Check the Voltage Regulator First!
These Buick models use an external voltage regulator. Sometimes, charging problems are caused by a faulty regulator, which is a simpler and cheaper part to replace. Before buying a whole new alternator, it's wise to have the regulator tested to ensure it's not the source of your electrical issues.
Aftermarket Brand Quality Tiers
Not all aftermarket brands are created equal. Based on owner feedback and industry reputation, here’s how the available brands generally stack up for your GM vehicle.
Tier 1: Premium Quality
These brands offer the best fit, reliability, and performance, often meeting or exceeding original factory standards. They are the top recommendation for owners who want maximum peace of mind.
- ACDelco (Gold Parts): As GM's own parts division, ACDelco is the closest you can get to original equipment quality. They are designed for a perfect fit and are the go-to choice for many GM classic car owners. While quality is generally high, be aware that even premium brands can occasionally have a defective unit.
- Bosch: A world leader in automotive electronics, Bosch offers both new and remanufactured alternators that are highly regarded for their quality and durability. They are an excellent alternative to ACDelco with a strong reputation.
Tier 2: Standard Quality & Good Value
These brands provide reliable performance and good value. They are a solid choice for daily drivers and budget-conscious restorations.
- Remy: Formerly Delco-Remy, this brand has a long history. Their new and remanufactured units are generally considered a decent mid-range option. However, some owners have reported premature bearing failures.
- WAI Global: WAI specializes in 100% new alternators, and many units even ship with a performance test result sheet. While this provides some assurance, some users have experienced whining noises or found that the real-world amperage output was lower than advertised.
Tier 3: Economy Options
These brands, primarily remanufacturers, can be a cost-effective solution, but quality can be inconsistent.
- BBB Industries: A major remanufacturer that supplies many auto parts store brands. Their products can be a good budget-friendly choice, but as with any remanufactured part, there is a higher chance of getting a defective unit compared to a premium new part.
- MPA (Motorcar Parts of America): Another large-scale remanufacturer that offers an economical alternative.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Alternator | $56 - $323 |
| Shop Labor for Installation | $100 - $200 |
Frequently Asked Questions (FAQ)
Can I install a higher-amperage alternator?
Yes, and it's a common upgrade. Many Rivieras came with 63-amp or 78-amp alternators. Upgrading to an 85-amp or 94-amp model (like the Delco 12SI) provides more power for modern accessories like upgraded stereos or lighting. If you make a significant jump in amperage, ensure your main power wire (the 'BAT' wire) is thick enough to handle the extra current.
Is a new or remanufactured alternator better?
A new, high-quality aftermarket alternator from a brand like Bosch or ACDelco is generally more reliable than a remanufactured one. New units have all-new components, while remanufactured units reuse the case and other hard parts. Remanufactured alternators are cheaper but can have a higher failure rate.
How do I make sure I'm buying the right alternator?
Check two things: the 'clocking' position and the pulley type. The clocking refers to the orientation of the electrical plug on the back of the alternator. Also, ensure the new alternator has the same type of V-belt pulley as your old one. Always confirm fitment using your vehicle's year, make, model, and engine size.
Can I replace the alternator myself?
Yes, this is a very DIY-friendly job for someone with basic mechanical skills. The alternator is usually located on top of the engine and is easy to access. The process involves disconnecting the battery, loosening the belt, removing a few bolts and wires, and then swapping the unit. The job typically takes about an hour.
Technical Specifications
The most common factory alternators are the Delco-Remy 10SI and 12SI models. Standard amperage was often 78 amps, with 85-amp and 94-amp units being common upgrades. These alternators use an external voltage regulator and a V-belt pulley system.
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.
- Buick Riviera: