Worn-out or Damaged Wiring: Inspect the electrical wiring system for any signs of damage, corrosion, or loose connections, particularly in areas that may be exposed to moisture during rainy weather. Faulty wiring can cause electrical shorts and disrupt the functionality of various electrical components, including the radio and gauges.
Water Infiltration: Check for water leaks or moisture intrusion into the vehicle's interior. Water can damage electrical components and cause malfunctions. Pay attention to areas such as the windshield cowl, door seals, and around the instrument panel.
Defective Ignition Switch: A faulty ignition switch can cause intermittent electrical issues, leading to the malfunction of the radio and gauges. When the ignition switch is turned to the "ON" position, it provides power to various electrical systems, including the radio and gauges. A worn-out or damaged ignition switch may not provide consistent power, causing these components to malfunction or even shut off completely.
Faulty Battery Terminals: Loose, corroded, or damaged battery terminals can cause poor electrical connections and lead to intermittent power supply issues. Ensure that the battery terminals are clean, tight, and free of corrosion.
Alternator Issues: While you mentioned that you have already changed the alternator, it's worth double-checking its functionality and ensuring it is properly recharging the battery. A malfunctioning alternator can cause insufficient power supply to electrical components, leading to their malfunction and eventual engine stalling.
Electrical Overloads: Excessive electrical demands on the vehicle's electrical system can also lead to malfunctions and power loss. Check if there are any aftermarket accessories or modifications that may be overloading the electrical system, especially if they are connected improperly.
Faulty Ground Connections: Poor grounding can disrupt the electrical circuits and lead to malfunctioning of electrical components. Ensure that the vehicle's main grounding points, typically located on the engine and chassis, are clean and making good contact.
Computer Issues: The 1996 S10 Blazer is equipped with an Engine Control Module (ECM) and other electronic control units that manage various electrical and engine functions. Water damage or electrical problems can affect these modules, leading to erratic behavior and potential engine stalling.
To accurately identify the root cause, it's recommended to have the vehicle diagnosed by a qualified mechanic or an automotive electrician who can perform electrical system tests and inspect for any underlying issues that may be causing these malfunctions and engine stalling on rainy days.
