Here's a breakdown of the installation process and how to address the charge light:
1. Components You'll Need:
* One-wire alternator: Choose one with the correct amperage for your needs.
* Wiring harness adapter (highly recommended): This simplifies the process significantly by providing the correct terminals and connections for your specific alternator and Mustang's charging system. Look for one designed for a 1965 Mustang conversion.
* Charge light relay (crucial): A one-wire alternator doesn't have a built-in charge light circuit. The relay properly interfaces the alternator with the charge light.
* Wiring: Appropriate gauge wire for the battery connection, alternator connection, and charge light connection.
* Fuse: Inline fuse to protect the circuit.
* Heat shrink tubing: To insulate connections and protect from chafing.
* Crimp connectors: To securely connect the wires.
* Possibly a new alternator bracket: The mounting might not be directly compatible.
2. Installation Steps:
* Remove the old generator and voltage regulator: Disconnect the battery's negative terminal first! Carefully remove the old generator and its related wiring.
* Install the alternator: Mount the new alternator using the appropriate bracket (possibly a new one). Make sure it's securely fastened and the pulley aligns correctly.
* Wiring (this is where the relay is critical): This is best done using a wiring harness adapter designed for this conversion. If not using a harness, here's the general approach:
* Battery Connection: Connect a heavy-gauge wire directly from the alternator's single "battery" terminal to the positive (+) battery terminal. Add an inline fuse close to the battery terminal.
* Charge Light Connection: This is the most crucial part. The charge light relay is essential. This relay will take the power signal from the alternator and properly send it to the dash light. The wiring will involve connecting the relay to the alternator's output (this might require tapping into the alternator's case), the charge light, and usually a ground point. Consult the relay's instructions for exact wiring. If done incorrectly, you could damage the dash light or the alternator.
* Ground Connection: Ensure a good ground connection between the alternator case and the engine block.
* Test: Reconnect the negative battery terminal. Start the engine and check if the charge light illuminates briefly and then goes out. If the light stays on, there's likely a problem with the alternator or the wiring (especially the relay). If the light doesn't illuminate, there's an issue in the charging system's circuit. Use a voltmeter to verify the alternator is charging the battery (should read around 13.8-14.2 volts when the engine is running).
3. Charge Light Operation:
The charge light in a classic Mustang works by completing a circuit through the alternator field. A properly working alternator pulls current through the light, causing it to go out. When the alternator isn't generating power (like when the engine is off or the alternator fails), the light remains on. The relay replicates this behavior for the one-wire alternator.
Important Considerations:
* Consult a Wiring Diagram: Obtain a wiring diagram specific to your 1965 Mustang. This will help you understand the original charging system and properly integrate the new alternator.
* Professional Installation: If you're not comfortable with electrical work, it's strongly recommended to have a professional mechanic install the alternator and perform the wiring. Improper wiring can lead to electrical damage or even fire.
* Correct Amperage: Choose an alternator with an appropriate amperage for your car's electrical demands. Too little amperage, and your accessories won't work properly; too much might damage other components.
The conversion isn't inherently difficult, but the charge light integration necessitates careful wiring and a proper understanding of electrical principles. Using a pre-made wiring harness adapter is highly recommended to avoid potential issues. If unsure about any aspect, seek the advice of an experienced automotive electrician.
