Ford Ranchero Alternator & Generator Upgrade Guide (1957-1965)
Is your 1957-1965 Ranchero still using an outdated generator? This guide covers modern alternator replacements and upgrades.
- First, identify if your Ranchero has a generator (pre-1965) or an alternator (1965+), as this determines if you are doing a replacement or an upgrade.
- Upgrading from a generator to a modern alternator is highly recommended for improved reliability and electrical capacity.
- For modified vehicles with extra electronics, choose a high-output alternator (100+ amps) from a brand like Powermaster or Proform.
- Don't forget the external voltage regulator; it's a common failure point on these vehicles and should be tested along with the alternator.
Generator vs. Alternator: What's On Your Ranchero?
The 1957-1965 model years span a major change in Ford's charging systems. Your Ranchero likely came from the factory with one of two systems:
- Generator (1957-1964): These earlier models used a DC generator. Generators are less efficient and produce little to no charge at idle. If your headlights dim significantly when you stop at a light, you probably have a generator.
- Alternator (1965): Ford began phasing in alternators around 1965. Alternators are more efficient, provide better output at low engine speeds, and are more reliable. They work with an external voltage regulator, which is a separate part mounted on the vehicle.
Because new, direct-fit generators are scarce and less powerful, most owners choose to upgrade to an alternator system when their generator fails. This is a common and highly recommended conversion.
Signs of a Failing Alternator or Generator
A failing charging system will leave you stranded. Watch for these common symptoms:
- Dim or Flickering Lights: Headlights and dash lights may dim, flicker, or get brighter as you rev the engine. This is a classic sign the alternator can't keep up with demand.
- Battery Warning Light: A "GEN" or "ALT" light on your dashboard indicates a problem with the charging system. Sometimes this light may flicker or only come on at certain engine speeds.
- Weak or Dead Battery: If the alternator isn't recharging the battery, your truck will run on battery power alone until it's drained. A new battery that dies quickly points to a bad alternator.
- Whining or Grinding Noises: A grinding or whining sound from the front of the engine can indicate worn-out bearings inside the alternator.
- Burning Smell: The smell of hot wires or burning rubber could mean the alternator is overheating or its drive belt is slipping and creating friction.
- Slow Electrical Accessories: Things like power windows (if equipped) or wipers may operate slower than normal.
External Voltage Regulator Failure
On these Rancheros, the voltage regulator is a separate component mounted in the engine bay. It often fails before the alternator itself, causing either no charge or an over-charging situation (which can damage the battery). If you experience charging issues, it's wise to test the voltage regulator as well.
🎬 Watch: How to test and replace an external voltage regulator.Choosing the Right Aftermarket Alternator
Original Ford (FoMoCo) alternators for this era are no longer produced. Your choice is between a standard remanufactured part or a new, higher-performance unit. For this vehicle, spending a little more on a quality new part can prevent future headaches.
Performance & Upgrade Brands
These brands offer new units, often with higher amperage outputs and modern technology. They are ideal for owners who have added electrical accessories or want maximum reliability.
- Powermaster: Highly regarded for classic Fords, Powermaster offers alternators that provide high output while often retaining a period-correct look. They are a popular choice for generator-to-alternator conversions and are known for quality and good performance at idle.
- Proform: Proform offers 100% new alternators, including compact, lightweight "mini-alternators" that can be useful for custom builds with tight clearances. They are a good option for street performance and racing applications where weight is a concern.
Standard Replacement Brands
These brands offer both new and remanufactured units that serve as stock-style replacements. While more budget-friendly, remanufactured parts can sometimes have inconsistent quality.
- MPA (Motorcar Parts of America): MPA produces a wide range of new and remanufactured alternators designed to meet or exceed original specifications. They emphasize their testing and quality control process.
- Remy: A long-established brand, Remy's aftermarket line is now associated with BBB Industries. User reviews are mixed; while some have no issues, others report premature bearing failures on remanufactured units.
- BBB Industries: As a major remanufacturer, BBB supplies parts for many retail stores. Quality can be a concern for some users, which is a common risk with any remanufactured electrical part.
| Part Type | Price Range | Notes |
|---|---|---|
| New Aftermarket | $95.90 - $503.92 | Best choice for reliability and performance. Includes high-output and custom-finish options from brands like Powermaster and Proform. |
| Remanufactured Aftermarket | $60 - $150 | A budget-friendly option. Quality can vary. Brands include Remy and BBB Industries. |
| New OEM (FoMoCo) | Not Available | Original parts for this vehicle are no longer in production. |
| Shop Labor | $150 - $300 | Expect 1.5 to 2.5 hours of labor, depending on whether it's a direct replacement or a generator conversion. |
What is a 1-Wire Alternator?
Many aftermarket alternators are "1-wire" units. This means they only require one wire to be connected from the alternator's output post to the battery. This simplifies wiring, making them a popular choice for generator conversions and custom builds. 🎬 Watch: Converting a 1964 Ford from a generator to 1-wire alternator. Traditional "3-wire" alternators use additional wires that connect to the voltage regulator and the dashboard warning light.
Frequently Asked Questions
Do I need to do any modifications to install an aftermarket alternator?
If you are replacing an existing alternator, a new aftermarket one should bolt in directly. However, if you are upgrading from a generator, you will need a conversion bracket set and will have to modify your wiring. Kits are available for this conversion. You will also need to bypass or replace the old generator's external voltage regulator.
What amperage alternator do I need?
A stock Ranchero with no added electronics will be fine with a 60-75 amp alternator. If you have added or plan to add an electric cooling fan, a powerful stereo, or halogen headlights, you should choose a higher output unit of 100 amps or more to handle the extra load.
Are there any recalls on the 1957-1965 Ranchero alternator?
No, there are no NHTSA recalls specifically for the alternator or charging system on the 1957-1965 Ford Ranchero. Any issues are related to the age and wear of the original components.
Can I replace the alternator myself?
Yes, this is a very DIY-friendly job. The alternator is mounted on the front of the engine and is easy to access. The process involves disconnecting the battery, loosening the belt tensioner, removing the belt, unbolting the old alternator, and then reversing the process. 🎬 See this walkthrough of an alternator removal on a Ranchero. A generator-to-alternator conversion is more involved but is still manageable for an experienced DIYer.
Helpful Videos
Technical Specifications
System Voltage: 12V. Amperage: 60-75 Amps (Stock Replacement), 100-200 Amps (High-Output Upgrade). Regulator: External (stock), Internal (most aftermarket 1-wire units). Drive Style: V-Belt Pulley.
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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.
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Generator vs. Alternator: What's On Your Ranchero?
- Signs of a Failing Alternator or Generator
- External Voltage Regulator Failure
- Choosing the Right Aftermarket Alternator
- Performance & Upgrade Brands
- Standard Replacement Brands
- What is a 1-Wire Alternator?
- Frequently Asked Questions
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