Question about Cars & Trucks
These systems have a 3 wire alternator with a internal regulator. Normal charging voltage is 13.2-14.8 volts @ 1000 rpm's just above a idle. With the engine OFF see if you can turn the alternator pulley a slipping belt drops charging potential. check for battery power with a volt meter on the 2 larger wires these should have battery voltage and with engine running they go up to charging voltage . the smaller wire is the turn on signal it only has power with the key on. . If larger wires have no power then the fuse link wire is burnt which is located on starter battery post. This wire is rubber coated and has a round clear raised connector with wire gauge stamped in it E.G. 14, 16. these wires never appear to be burnt pull on then gently if they stretch it is broken. replace with new fuse link wire. if all good then problem is alt.
Posted on Mar 23, 2014
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Posted on Jan 02, 2017
First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??
What Voltage do you have at same Place with Engine Running ??
Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??
Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??
If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..
Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...
Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!
Posted on Jan 07, 2009
Check all your fuses if you had a system failure it could have blown a fuse. I am not sure on your vehicle where the fuse is in the car or under the hood it could also have a relay. You can check your alternator by checking the voltage at the back of the alternator where the big wire bolts on. You should have 14+ volts at the alternator.
Posted on May 24, 2009
Check out this link... better than a diagram, a photo.
note: on my screen this guy's "purple" circle looks more like a light blue, maybe lavender.
Posted on Jun 27, 2009
Best way is to drive car to AutoZone or Sears, they will check it in the car free. The alternator does not need to be removed.
You can also use a multimeter ($5 ~ 50) also known as a "volt-ohm meter".
Start engine and be careful because the multimeter test leads can get caught in the spinning fan, fanbelt, pulleys, etc.
The safety factor may not be good enough for you to attempt.
Do not try to retrieve any test wire that falls or gets caught.
Clamp the black (ground - negative) probe to the engine somewhere close to the alternator. Place the red test lead on the red alternator wire that is held onto the alternator with a nut. It may be covered-up by a red rubber boot.
Place multimeter (and test leads) in a safe position where you can read the multimeter display. You will start the engine, so make sure it will stay in place.
Read the meter. It should read 13.8 volts on the DC scale. A small fluctuation is normal. Turn OFF engine and disconnect meter.
There are further tests; however, this should have given you the result you need.
Posted on Oct 02, 2009
i have a 05 cobalt SS Superchaged and i bought it new and had to warrenty two batteries and i put another battery n about 7 months ago
Posted on Mar 17, 2010
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