I have a 2003 sierra z71 5 3 i just put a new alternator and battery in the truck any time i put any kind of a load on the alternator the voltage meter drops down to as low as 9 10ish.
2000 chevy silverado voltage drop.
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The truck is a 2005 silverado with a 5 3l engine 4wd with about 75 000 miles.
I have changed out 3 alternators.
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The charging voltage should be at least 0 5 volt above base voltage reading.
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Sometimes it jumps back and forth.
If not excessive resistance could be present.
The voltage use to stay on 14 volts most of the time.
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Apr 03 2018 11 45am.
Chevy truck forum silverado sierra gmc truck forums.
I have a 2009 silverado 1500.
01 03 05 12 50 pm post 590565 2001 silverado 4x4 x cab 5 3l lt my voltmeter will randomly drop from approx 14 to 11 then back up to 14.
If i am stopping at a red light the voltage will drop but not enough to cause the engine to cutout yet and then come back up to normal.
With the engine at 1 500 to 2 000 rpm turn on all electrical loads lights blower fan a c etc.
A voltage drop test will assess voltage losses at the battery the alternator and the starter.
Just as soon as a turn off what ever is drawing the power it goes right back up to where its supposed to be at 14 15ish.
It happens 3 4 times per week.
The truck doesnt die.
However even when i just slow down and start turning the voltage will drop then come back up to 14.
Search my electrical problem post from last year under rbird52.