I just replaced the plugs, cap, and rotor on my '87 (a few days ago).
That same day, I started it up, took it for a spin, and everything seemed
fine.  This morning, it struggled to crank over a few times, and then it
just wouldn't budge....symptoms of a very low battery.

So, here's the question.  I don't think that replacing parts would cause
the battery to drain in any way, but is there anything that I might have
knocked loose?  I took out the air filter housing to change the plugs on
the passenger side.  Otherwise, I didn't intentionally move anything.  The
battery is only a few months old, and I will check the condition of it
first unless there's another obvious answer.  I'm just hoping that
somebody out there has an idea.  By the way, the interior light and radio
still work, and the westy battery indicator glows yellow (though this
doesn't mean too much).

thanks for the suggestions,
David
'87 westy stuck in driveway