Chrysler Imperial Voltage Regulator: 1956-1961 Replacement Guide
Keep your Imperial's unique generator charging system working correctly with the right voltage regulator.
- Confirm your Imperial has a generator, not an alternator, as they require different regulators.
- Choose a modern electronic regulator (like those from Standard Ignition) for reliability on a car you drive often.
- Ensure the regulator has a clean, bare-metal ground to the firewall to prevent overcharging.
- After installation, you may need to polarize the generator; check a service manual for the correct procedure.
Understanding Your Imperial's Voltage Regulator
The 1956-1960 Chrysler Imperial uses a 12-volt electrical system with a generator. The 1961 model year was a transition period to the more modern alternator. It is critical to identify which charging system your car has. This guide focuses on the generator-based systems common in this era. The voltage regulator is a small box, typically mounted on the engine bay firewall, that controls the generator's output.
Symptoms of a Failing Voltage Regulator
A bad regulator can cause confusing electrical problems. Because it controls voltage, symptoms can show up as either too little or too much power.
- Dimming or Bright Lights: Headlights and dash lights may flicker, appear dim (undercharging), or get excessively bright before burning out (overcharging).
- Battery Problems: A constantly dead battery is a common sign of undercharging. If you smell rotten eggs or see fluid leaking from the battery, the regulator may be overcharging it, which is dangerous.
- Erratic Gauges and Engine: The car's ammeter may show a very high charge or discharge. The engine might sputter, stall, or accelerate unevenly as the electrical system struggles.
- Intermittent Electricals: Your radio or other accessories may work unpredictably.
Warning: Overcharging is Dangerous
An overcharging condition can cause the battery to overheat and potentially explode, spraying sulfuric acid. If you notice the battery is hot to the touch, bulging, or smelling like sulfur, stop the vehicle immediately.
Choosing the Right Aftermarket Regulator
For a classic car like the Imperial, finding New Old Stock (NOS) parts can be difficult and expensive. Aftermarket parts are the most common solution. For this vehicle, you have two main choices:
- Mechanical (Points-Style) Regulator: This is a reproduction of the original factory design. It uses mechanical contact points to regulate voltage. While it keeps the car original for shows, the points can wear out, require adjustment, and be less reliable for a car that is driven regularly.
- Electronic Regulator: Brands like Standard Ignition offer modern, solid-state electronic regulators built inside a classic-looking case. These have no moving parts, provide a more stable voltage, and are generally much more reliable and durable, making them the recommended choice for owners who drive their Imperials.
Pro Tip: Standard Ignition Brand
Forum discussions among classic Mopar owners often point to Standard Ignition as a reliable aftermarket brand that offers both mechanical and electronic options. An electronic version can be a 'fit and forget' upgrade for improved reliability without altering the stock appearance.
Expected Replacement Costs
The cost for a new aftermarket voltage regulator is reasonable. Installation is simple, making DIY a great option to save money.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Regulator (Standard Ignition) | $80 - $147 |
| Shop Labor | $50 - $100 |
| Total Estimated Cost (Shop) | $130 - $247 |
Frequently Asked Questions (FAQ)
Is this a difficult part to replace myself?
No, this is one of the easiest repairs you can do. The regulator is typically held to the firewall by two screws and has a single wiring plug. The entire job takes less than 30 minutes. Just be sure to disconnect the battery first.
Why is a good ground so important?
The regulator gets its ground connection through its metal case and mounting screws. If the mounting area on the firewall is rusty or painted, it can cause a bad ground. A bad ground will trick the regulator into overcharging the system. Always scrape the firewall to bare metal where the regulator mounts to ensure a clean, solid ground.
What is "polarizing the generator"?
After replacing a regulator or disconnecting the battery, the generator may need to be polarized to restore its residual magnetic field. This is a simple process, often involving briefly touching a wire between the 'BAT' and 'ARM' or 'GEN' terminals on the regulator. Check your vehicle's service manual for the exact procedure for your Imperial, as doing it wrong can damage the regulator.
Can I use a regulator for an alternator on my generator system?
No. Regulators for generators and alternators work on different principles and are not interchangeable. You must use a regulator specifically designed for a 12-volt generator system.
Technical Specifications
System Type: 12-Volt DC with Generator. The regulator is an external, mechanical or electronic unit. The 1956 models used a 30-amp generator.
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.