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.
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HOMESERVICE MANUALSDODGE1991SHADOW L4-135 2.2L SOHCREPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMALTERNATORRECTIFIER DIODE / BRIDGEDESCRIPTION AND OPERATION
1991 Dodge Shadow L4-135 2.2L SOHC
Rectifier Diode / Bridge: Description and Operation
1991 Dodge Shadow L4-135 2.2L SOHCSECTION Description and Operation
Six or more silicon diode rectifiers are used. A silicon diode acts as an electrical one-way valve. One half of the diodes have ground polarity and are pressed or screwed into a heat sink which is grounded. The other diodes (ungrounded) are pressed or screwed into and insulated from the end head. These diodes are connected to the alternator output terminal.
Since the diodes have a high resistance to the flow of current in one direction and a low resistance in the opposite direction, they may be connected in a manner which allows current to flow from the alternator to the battery in the low resistance direction. The high resistance in the opposite direction prevents the flow of current from the battery to the alternator. Because of this feature no circuit breaker is required between the alternator and battery.
Since the diodes have a high resistance to the flow of current in one direction and a low resistance in the opposite direction, they may be connected in a manner which allows current to flow from the alternator to the battery in the low resistance direction. The high resistance in the opposite direction prevents the flow of current from the battery to the alternator. Because of this feature no circuit breaker is required between the alternator and battery.
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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.