Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry for the long wait
my name is Gary
if you leave the negative battery cable off over night then connect it back in the morning will it crank over just fine and if you leave it connected up over night it will start slow like the battery is worn down ?
these type of issues is an intermittent big draw that when acting up will draw it down very fast or an intermittent bad connection at the starter
at this point its very hard to say which
since the battery cables are clean and tight and if they are can you have the battery retested for volts and for bad cells and for cold cranking amps again ?
if that still testes good and it will start fine every time with the negative battery off over night then there is an intermittent draw that a shop will need to connect a multi meter and see if you can capture it drawing over 50 MA if it does then then pull one fuse at a time and what ever fuse they pull that the draw drops below 50 MA is what the draw is
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disconnect the negative battery cable and put the meter in series where one meter lead is at the negative at the battery and other lead on the negative cable end so the meter is kind of the negative battery cable then leave the truck sitting for 15 minutes and see if the reading is over 50 MA if so then pull fuses to find the draw
that is correct
what ever device is on the fuse you pull is the device not turning off
but again double check the battery and alternator before you do that draw test route
that is fine
have to had the battery checked for bad cells and cold cranking amps ?
with a battery tester it will test cold cranking amps and for bad cells be sure that battery is tested good for both of those next
at this point if the battery tests out good then only thing left would be a possibility of the computer not telling the alternator to change intermittently which ends up being a computer reprogramming issue where a shop or the dealer can update the programming in the computer or a computer issue itself
i think that battery is bad
once the engine was running the alternator would fully charge the battery
if this is going dead this fast the battery itself is usually the issue