2009 Chevy suburban voltage low

Asked by Simmons32 Apr 27, 2020 at 07:38 PM about the 2009 Chevrolet Suburban 1500 LTZ 4WD

Question type: Maintenance & Repair

Recently bought a 2009 Chevy Suburban. One day
car didn’t start so got a new battery. About a week
later the battery voltage was reading low and on
star would turn on. Replaced the alternator. Got it
backed did the same thing. Replaced alternator
again. Got it back today and doing it again. If I
drive for about 10 minutes it starts acting goofy.
Battery voltage little above 14 when I start it.
Picture will show what it drops to. Any suggestions
would be appreciated. Had this car for a month
and basically can’t drive it. Also had to rebuild
transmission and replace techm...don’t know if
that would be related in anyway

1 Answer

Thank you for your advice. Taking it into the Chevy dealer next week. Went out and drove it this morning to figure it out. At higher speeds with heat on voltage stays up. When I come into town is the problem. Taking off from stop sign voltage drops if heat is on. Shut the heat off and it will stay fine at stop sign.

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