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Re: volt gage jumping arround less notice when under...
I would first suggest using a volt /amp meter and test the voltage from the large wire off the back of the Alternator. You will need a second person to help feather the throttle to change the engine speed. You should see a steady increase in voltage from 12.6 to 14.5V when the idle is increased. If the voltage jumps around on the meter then chances are you have a bad voltage regulator in the Alternator and need to replace it. If the voltage is normal and doesn't bounce around then you have a faulty gauge in the dash.
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I should think that you tested the battery voltage with a multi meter and you would expect 12.6 volts . However if you test a battery use a load tester that simulates the battery under load as from a starter and you would find that the 12.6 volts drops to the red zone . have a load test done on the battery and you will probably find a faulty cell
The first thing to do is check that the belt that drives the alternator is in good condition and is properly tensioned. Check the connections at the alternator for corrosion or looseness. If all is in order the alternator will be the most likely problem. Very common issue on these vehicles. Thank you for using FixYa.
Have the alternator checked,it should read at the battery 13.65 volts to 14.25 volts,with the ac on high blower,and the headlights on.If it does not read this range,replace it,have the battery checked,make sure it is good,have it load checked.Also tighten the alternator belt,or replace the tensioner if needed,and the belt.
Clean the battery post's & give it a jump start, check that the alt is putting out 13.5 to 14 volts. If it's putting out less that 13 volts check the condition of the drive belt, good contact is a must for the alt to do it's job.If Belt is good & less than 13 volts alt is weak & cannot keep up with the load.
one of the gauges must a fluxuated enough to have the computer turn the light on,I've seen mostly gas gauges fluxuate,but train your eye where the voltage is in normal mode because it will still look like the needle is up there but it may only be 11 volts instead of 13-14 volts running.
With a good fully charged battery no load should be 13.4 to 14.2 volts DC, loaded 13.4 to 14.4 volts DC. You can also check the AC volts it should not be over 0.040 volts AC a higher reading indicates a diode problem (batteries won't charge with AC voltage).
you need to set the tps voltsge o that engine between .55 volts and .60 volts. with a voltmeter- check to find one of te three wires on the tps plug and find the wire that has less than 2 volts on it. the other two have 5 volts and ground. loosen the screws on the tps and rotate it until the voltage is arround .56 volts. - good luck
Hi,check the voltage at the battery as you try to crank it for starter draw.I worked on a gm the other day that had the same symptoms.It ended up being the battery.It had 12.2 volts until i turned the key to the start position,then it dropped to 5 volts.Had a dead cell.Hope this helps.Good Luck!!!
I had the same problem with the over temp sensor on the compressor. I had it repaired at the dealer for $200.00 plus. I just had the same problem reoccur. This time I bypassed the switch myself.
There is a small wire harness that runs from the compressor above the radiator, inside there are three wires. After determining which ones to jump " two smaller gage blue" the AC system works fine in all modes.