Re: Dead Battery
If GEN light is off during engine running, alt should be working. A multimeter across the battery posts will show electrical system voltage.
If externally regulated, you will have to rev up the engine to about 2000 rpm to read min 13.5 volts with no acessories on at operating temperature as the battery and ext reg gets warmer, less voltage is needed by the battery to recharge, if you have a mechanical regulator. You can improve by swapping out the mech ext reg for an electronic reg, Wells P/N VR715, plug & play, don't forget the ground strap.
New batteries take a few hundred miles to get fully charged. Starting once a week and driving 50 miles doesn't help too much, but better than letting it set idling as less voltage is available.
At night, you might take a test light and put it between a battery cable and battery post. With OE accessories, there should be no light from the test light. Modern stereo unit would make it glow as memory would be drawing miniscule power, a very light glow. Any more brightness would indicate a light on - glovebox light is one usually seen, if equipped. A repeating short burst of brightness would indicate a clock kicking in to wind the spring to keep time.
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