we have a 99 Chevy Suburban, K1500, approx.
56K miles. New battery & new belt, (recently).
From the alt., I'm noticing a weird whirring
sound. Not loud, but it's noticable at idle
speed. When the engine is warm, and again at
idle, I'm noticing the voltage is anywhere from
9 - 11 volts. When at cruising speed, sometimes
the alt. will reach 13.5 - 14volts. But most of
the time it stays around 12. As noted, I have
a new battery and belt. (the alt. is not keeping
the batt. charged...).
Is it typical for the alt. to start having probs
with this amount of mileage?
Also, I noticed that the pulley tensioner doesn't
really keep the belt "real tight". There's a little
bit of flex. (I can push the belt in a little by finger
tip pressure). Is the belt supposed to be super
tight? I can pull on the pulley a little bit, and this
will then make the belt super tight. But I can't keep
it this tight, (unless you're supposed to torque the
tensioner pulley). Is there a specified torque for the
bolt that holds the pulley tensioner?
I guess worst case I'll run down and get a new
alt.... Just curious if my problem is with the
belt/tension, or if the alt. is trashed.
a couple weeks ago I took the alt. into AutoZone and
they did their little test. Not sure if they can put an actual
load on the alt. All they said (after a couple minutes), was
that it was discharging proper voltage.
I took my battery back to Checker, and they replaced it
free of charge with a new one. Still the same problem with
the voltage readings.
TIA for your help.
-Gregg in AZ.