If I have a very dead car battery, and put on my battery charger, the
clips vibrate when they are on the battery. This occurs on both my 6
amp and 10 amp charger. At the same time, the meters are pegged, so the
battery is pulling max amperage. Why do they vibrate?
This does not happen when the battery is partly charged and just needing
a little help.
My guess is that your battery charger is using an AC to DC rectifier that
puts out either half wave DC or unfiltered full-wave DC. It's cheaper to to
do it that way. So, the DC pulses at high current set up an electromagnetic
field in the wires and clips that forces the clips to vibrate. It's a bit
like a transformer when the coils or laminations work loose.
The forces are still there at low current, but they're not strong enough to
make the clips vibrate.
Battery is fine. I just left the dome lights on all night the other
night, and it was on most of the day too, before I went to start the
car. No start!!!! The dome lights drained it dead after about 19
hours. The guy who said it's rectified to half cycle, or full wave,
with no capacitors makes sense. This is not the first time I've noticed
this, I just finally decided to ask out of curiousity.
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