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Long starting crank, Battery, alternator or starter problem, please ad

vdubpower

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vdubpower Enthusiast

vdubpower

Posted
Posted

hello all

 

so briefly, today when I started my truck, 2006 Denali, i noticed that it took a longer crank to start, Had to hold the key down , and it finally started.

The radio time reset to 1200 but the stations were not reset, and everything else was fine.

The truck drove fine. I got to where i needed and when I left, Same thing happened

The entire time the battery meter in the dash was a touch past 14 as it usually is

 

I got home and checked the battery with a voltmeter

with the car on it was 14

 

with the car off it was 12.40ish but did seem to fluctuate from 0,00 - 3, to 5 and 12.

 

One week ago, the car was left with its key in ignition position 1 and the battery did drain for a few hours and needded to be jumped, Otherwise not issues

 

Battery is a interstate 850 2 yrs old

 

thanks for any help as to what i should be looking into

vdubpower Enthusiast

vdubpower

Posted
  • Author
Posted

how else can u test a battery besides checking its voltage? it showed 12.3 or so when the car was off....

 

what would be signs of it being an alternator instead

1997SierraSLT Enthusiast

1997SierraSLT

Posted
Posted

just because it tests at 12-14 volts doesn't mean it's a good battery. sounds like you may have a cell that has gone bad. Down in Florida, the most life I could get out of a Die Hard battery was about 2 years.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

take it to a parts store that can load test it ,,,,,after you charge it up with a charger

 

alt is checked with a load tester while running to check its amp output

 

if you clock reset while cranking ,the battery has charded the bed

vdubpower Enthusiast

vdubpower

Posted
  • Author
Posted

i went back to firestone where i got the original

 

they did their basic test on it and instead of 700cca it cranked at 529cca and the reading said replace

 

so i got a prorated price and just went with it

 

they said for 25 bucks they do the comprehensive check whihc i guess checks the alternator load. But the tech said that even to do that test u need to have a good battery

 

ill have to assume that all is legit...

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

i went back to firestone where i got the original

 

they did their basic test on it and instead of 700cca it cranked at 529cca and the reading said replace

 

so i got a prorated price and just went with it

 

they said for 25 bucks they do the comprehensive check whihc i guess checks the alternator load. But the tech said that even to do that test u need to have a good battery

 

ill have to assume that all is legit...

every tech can do things different from the next to some degree,,,you can pull near max amperage out of an alternator with a hurtin battery with an AVR machine so ,,,,

mike94silverado Senior Enthusiast

mike94silverado

Posted
Posted

just ran into this today..... Undersized battery to start with for the climate here (615) and they suspect a cell may be bad, may not be (machine said it was OK but the regular multimeter showed low but they said either way the 615 just doesn't cut it up here.... Ordered a new battery.

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