Alt. locks under load
04-01-2009, 07:34 PM
#1
Member
Thread Starter
Join Date: Sep 2007
Location: Bastrop, Tx
Posts: 322
Likes: 0
Received 1 Like
on
1 Post
Car: 87 Iroc-Z
Engine: 305 tpi
Transmission: 700-r4
Axle/Gears: 3.42
Alt. locks under load
My voltage drops to around 9v at idle ( checked with volt meter not guages) and comes back to 14v around 800 and above then drops off to around 10v at 2100 and higher. I just went out and cleaned all connections and tightened my belt. i noticed that when i spin the alt. pulley by hand there is a little squeak. I turn the car back on and notice that if i rev it with the lights and heater on the belt will squeal( yes its in great condition and has a good amount of tension) but if i turn the lights and heater off it doesnt squeal when reved. is my alternator bad
04-01-2009, 09:42 PM
#2
Member
Join Date: Jan 2009
Location: St. Aug
Posts: 134
Likes: 0
Received 0 Likes
on
0 Posts
Car: 92 Z03 RS TBI
Engine: 5.0 L03
Transmission: T-5
Re: Alt. locks under load
it certainly sounds like an alt problem. I don't know if you've done it before, but alts come off with like 3 bolts. Pretty much any auto place (auto zone, advance auto, etc) will test it for you. Took 5 min when I brought mine in yesterday.
04-02-2009, 12:46 AM
#3
Junior Member
Join Date: Mar 2009
Location: middleton, NH
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
Car: 83 z-28
Engine: 305 LG4
Transmission: T-5
Axle/Gears: 3.23
Re: Alt. locks under load
possibly the bearing is not doing its job so smoothly and under load it might be causing it to lock up
04-02-2009, 09:39 PM
#4
Supreme Member
Re: Alt. locks under load
A worn pulley can cause the belt to slip under load
when the belt is good and has decent tension.
It is normal for alternator brushes to squeak a little
when turned by hand-14 v sounds good,but 9v at idle
10v above 2100 rpm sounds way low-batt volts should
be 12.5 or so without alternator working...
when the belt is good and has decent tension.
It is normal for alternator brushes to squeak a little
when turned by hand-14 v sounds good,but 9v at idle
10v above 2100 rpm sounds way low-batt volts should
be 12.5 or so without alternator working...
Thread
Thread Starter
Forum
Replies
Last Post
Damon
Tech / General Engine
8
09-26-2015 04:29 PM
Dragonsys
Engine/Drivetrain/Suspension Parts for Sale
2
09-25-2015 03:51 PM