Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Alternators - Transistorized Regulator: Description
This unit is a fully transistorized voltage regulator using transistors and diodes to regulate the alternator field current and control alternator output. It is used optionally with the conventional double contact voltage regulator and can be identified on sight (see illustration). An adjustment is provided (40-ohm adjustable resistor on bottom of regulator case) by which regulator performance can be adjusted to provide correct operating voltages. This regulator is used with a conventional field relay (separate unit) and wiring is different on cars using an ammeter instead of a charge indicator light (see wiring diagrams).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.