Re: Charging issues
Start from the beginning - Place a test light - it can be a 1156, 1157, or a 194, any bulb, and place it between a battery cable and battery post.
Depending upon present current demand, light bulb will be glowing brightly (short), or very dim glow, if aftermarket electronics is installed.
Original design of electrical system of the Camaro, no late model radios, no amplifiers, no ECM/PCM's, all doors shut - including glovebox, trunk closed, and headlight switch knob fully CCW, the test light should be out. You may need to view Camaro at night ensuring ALL courtesy lights and optional lights, are out. If original clock option is installed, a rhythmic surge of power will brighten the test lamp - solenoid powers up to wind the main spring.
If test lamp is glowing, start pulling a fuse one at a time and check bulb brightness.
The fuse killing the test lamp is the faulty circuit.
If all fuses are out and light still ON, then disconnect red power wire shown and two results will happen - 1. light out meaning short in red wire to fuse panel,
or 2. light on caused by an additional unfused circuit (aftermarket?) connected.
Once short is accounted for and accepted, measure across battery posts and as suggested, min 14 volts, should be measured - maybe 0.5 volt more on alternator BATT stud.
If battery post measurement is alot less than alt stud, then two red wires on horn relay buss bar need to be removed and wire brushed and stack them both on the same screw. Also, the junction block shown, same here, disassemble and wire brush, and assemble.
Note: sometimes, underneath the junction block, rust builds up between the stud and radiator support and becomes a drain path. Might want to remove the block and check - maybe put a piece of electrical tape on the stud for insulation.
Measure from alt BATT stud to positive battery post and should read less than 0.4 volts
Have you cleaned battery clamps?
Same for negative, post to engine ground, or better yet, alt case to negative post - chrome & paint do not conduct electricity very well.
Once you're done, you could externally charge battery overnight. Never hurts.
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