Archived Ammeter bottems out..

[MxShawn]

Hey i need some help, my trucks in my sig, i start it up. . ammeter reads fine, voltmeter on the batt reads 13-14 volts. . its charging... as soon as i hit 60 MPH the ammeter drops off and the check gauges light comes on, test the batt. . 12 volts, not charging . . i cant shut it off and start it back up and it will charge again. . till i hit 60... i read up last night and people whos alternater went out, from what i read, the ammeter was very sporatic. . i changed the alternater and it does the same thing. . im lost. . the serpintine belt is fine. . everything else is fine. . please help. . thanks in advance

 

[Tinman]

I thought I was the only one with an ammeter in my truck.



Firstly, how did you hook up the shunt? On my 01 it was easy, I put it between the power from the batt. to the power distribution center. It works for perfectly for discharge and charge. The charge amps from the alternator to the batts. are controlled here.



On the 06 it is a different set up. The alternator hooks straight to the battery and the the charging amps to the batt. are regulated at the alternator (by the ecm I assume) and doesn't go thru the distribution center. So my ammeter only shows discharge or charge depending on how it is wired. I have to show charge. I don't know how the 04s are.



In your case, you have unusually symptoms. I'd think the voltage regulator may be bad. Is it 60mph or a certain rpm (with happens to correspond to 60mph)?

 

[Huff N Puff]

Do you have

Hey i need some help, my trucks in my sig, i start it up. . ammeter reads fine, voltmeter on the batt reads 13-14 volts. . its charging... as soon as i hit 60 MPH the ammeter drops off and the check gauges light comes on, test the batt. . 12 volts, not charging . . i cant shut it off and start it back up and it will charge again. . till i hit 60... i read up last night and people whos alternater went out, from what i read, the ammeter was very sporatic. . i changed the alternater and it does the same thing. . im lost. . the serpintine belt is fine. . everything else is fine. . please help. . thanks in advance

An Amp meter and a volt meter

 

[HBarlow]

Replace the batteries.

 

[MxShawn]

I did and it runs great. . thanks again