|This may sound like I'm a dummy but. How do I check for faults with an ohm
Well you should not use an ohm meter on a circuit that is energized.
The voltage may blow a fuse in your meter or worse. Ohm meter is only
good for non-energized circuit.
Use volt meter instead, you know how to do that. This is not an easy
problem. Electrical system problems are amongst the toughest to
solves sometimes. Not easy to do.
You could have a defective hi-lo beam switch, that is leaking current
when it is supposed to be -off-. Maybe this is the problem, maybe
To check it quickly, detach the connector to the back of your left
headlight. See if there is a voltage there when the light is supposed
to be off. If there is a voltage there when the light is supposed to
be off, there is the problem. Not enough current to light the lamp,
but enough of a parasitic load to run your battery down.
What is the chance of this happening? 1 in a million. The same as
for anything else being wrong. But that is the fastest/easiest way to
check for hi-low beam switch without tinkering with the steering
You should see zero volts when lights are switched off. If you do,
that is checked off the list of possible faults.
also, remove your dome light or turn it off when you are making these
tests, because with your door open, of course that is going to be
pulling current from the battery.