Re: Battery drain, dead overnight.
Good suggestions given and a test light is real good as you can see the current being drawn.
The bulb will not burn out because current is limited by the bulb filament.
The less the brightness, the less current drawn.
You might pull off from the radiator support, next the battery, the junction block the cable pigtail is attached.
Over time, some rust mat develop between the block stud and support, creating a current path.
As suggested, unhook alt BATT red lead, in case a bad diode.
Also, there are two red wires on horn relay buss bar. One from battery, via junction block mentioned, the other feeds the rest of the electrical circuitry via fuser panel.
Ammeter would be good in viewing the amount of current drawn.
Last point, maybe alternator is not recharging battery enough, engine hasn't ran long? and could need an external charge overnight?
Usually, alt would need to run for about 15-20 miles for a fairly good recharge.
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