Alternator tested 'On Vehicle' of 'Bench Tested' ??
I recommend begining with a scan,followed by our shop's standard fault tracing procedure....
INSPECT BATTERY ELECTROLYTE LEVEL
INSPECT BATTERY RESTRAINT
INSPECT BATTERY CABLES/TERMINALS
****LOAD TEST BATTERY,_______VOLTS @ 150 AMPS (Min SPEC 10.2 VOLTS @ 150 AMPS.)
TEST STARTER AMP DRAW,______AMPS INITAL,_____
AMPS SUSTAINED.
****INSPECT BELT(s),
****TEST ALTERNATOR OUTPUT,_____AMPS @ 12 VOLTS @ 2500 RPM (SPEC ______ AMPS.]
****TEST FOR DRAW,______(MAX ALLOWABLE 350 Ma),
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SOURCE: 96 ford mustang gt charging problem
I have had nearly exactly this problem in a different car. The starter was the culprit. It was worn down to a point where it was just threshold acceptable electrically and mechanically to turn and do its work. Yet it drained very high amperage during this work. If you have the time, remove the starter and disassemble it. Then cleant the copper commutator thoroughly using ScotchBrite pad, diesel fuel and strong hands.Then ensure the brushes are long enough and brush springs are ok, then clean brushes and holders with a stiff brush and fuel. Then blow dry with compressed air the run a bench test...clamp the starter down and apply a well-charged car battery and an ammeter. It should only draw about 5 to 10 amps steady after startup, but much heavier at startup under load...could be up to 500 amps depending on your bench test....difficult to apply loads here...main point is low current under no load.
A second possibility, other than a wire harness default, is the car's computer has gone bad...try a diagnostic code checker...
SOURCE: Charging system
change your battery cables and check all wires on the alternator for loose connections, expecially the grounds.
SOURCE: DEAD BATTERY
should be something simple like a loose ground or a hot wire touching somewhere that is causing the battery to drain down
SOURCE: my 2000 ford ranger and something draining battery
bad alternator possible or bad battery..even though its new that battery can be bad. I would take a volt meter and with the engine running check the volts of the battery..If the volts are 12 you need to replace alternator, if volts are 14 you need to check the battery. to check the battery hold the volt meter to the battery and have someone start the car..while the starter is cranking battery volts should not drop below 10volts.if they do your battery is bad.
SOURCE: rpm's jump up and down while in park.
The variable engine speed can be diagnosed by checking for codes. If the charging system was not working, your in-dash battery gauge would show a discharge condition. Most likely the battery has reached the end of its life
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