That battery charger is not any kind of battery tester, it can not say by its self good or bad battery. ever.
only load testers can or the below. (cranking tests)
it my get correct battery is low and needs to be charged
the charge can be used (good ones) force to charge the battery a 15amp charger is best, (2 hour can cure this)
after the battery is force charged or jump cable jump charged, the stater motor nmnow starts the engine
this act takes, 100 to 300 amps of current flow, and proves batter is both good and bad, or load test the battery in any
autostore.
do not leave cell phones connected when car is not running or soon.
the charge ports on my car , one is hot full time key off, so never leave things on any hot all the time power port.
next up is BCM games (facts of life) and worse now with 10 computer in cars.
The BCM brain the body brain , will go crazy when the battery does drain low (or battery bad) at near 10vdc
some electronics go dead or random. acts of crazy
all computers do that, as there, regulators chips go offline or bounce at the threshold of power loss,(weAk)
all computers (processors and micro controllers do that ) bad power DC.
test 1: is charge battery first fully, and start engine
battery voltage (a dmm meter) reads 13v to 15vdc, lower volts is bad alternator (or its 3 fuses blown) one of them.
test 2, for phantom drains test short version ask for 10- page versions.
KEY off, battery fully charged use a real battery charger, 15amps is good and forced to charge.
ammeter clamped to the battery PLUS lug wire large (a tool)
current flow key off spec max is 0.050amps (50mA) or less. over is called a phantom drain, (or current)
ok it fails
in the dark (totally) find lamps stuck on in the car ,every where. even under hood lamps ,glove box. etc.
the silly cell phone, uses 1 amp to charged 1000mA, and is 20 times over spec , key off so remove he silly phone.
cured? (a shocking discovery , LOL)
NO !
same ammeter showing the current way too high key off
NEXT:
pull fuses , 1 by1 , one out, see no drop, fuse back , next fuse. find the fuse that causes huge drop in current.
this finds the branch of the wiring tree that is overloaded.
most times this finds the path that is draining. (some alternators do this and fuse to it can not be found easy)
to go to the end run, ask, ( all electric tech know this process)
ask.
No need to respond. I have the solution.
×