For awhile the needle would oscillation between the normal 50-60%
position a few degrees after driving a half hour or more with the
headlights on. Then I cleaned all the connections in the starting
systems from battery terminal to hot connections and grounds, and the
Then last week, I had driven to a store at dusk with the lights on - no
problem indicated. I left the lights on for 20 minutes while in the
car. Then when I started, the battery needle start oscillating from 50%
to 100% regularly, and the warning light started blinking.
Car was running fine so I turned off the headlights and just put on the
parking lights so I could drive the 2 miles home. After driving about
1/2 mile the oscillating and flashing stopped.
I have tried to duplicate the problem so I could show a mechanic, but
all is back to normal for now.
Without knowing anything, I would guest that the computer detected some
kind of low voltage and the swinging and flashing was an
attention-getter, and not the actual reading.
Any ideas how to troubleshoot this?