How do you all get 6.2s to 300K miles

[Will L.]

Something definitely isn’t happy.
Did you ever put an actual voltage meter on the batteries while running to compare to the dash gauge?
14.4 is the desired rate when batteries are charging

 

[nycxjeremyy]

It was at 11.8 at idle and stuff. Peep screenshot for reference.

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[dbrannon79]

those cigar plug adapters only are reading voltage that is going into the cab. need to get a real multi-meter and probe the batteries and on the back of the alternator.

one of these meters... you can pick up a cheap one at any auto parts that will work fine for this.

 

[jrsavoie]

those cigar plug adapters only are reading voltage that is going into the cab. need to get a real multi-meter and probe the batteries and on the back of the alternator.

one of these meters... you can pick up a cheap one at any auto parts that will work fine for this.

View attachment 98489

The cig lighters read correct voltage on everything Ive used them on

 

[dbrannon79]

If your seeing normal 13.5~ voltage at high speed but goes low cruising around town, it almost sounds like a diode has failed in the alternator. at idle you should be seeing normal charge voltage (above 12 volts = 13.1+) as you increase the RPM to around 800-1000 voltage from the alternator should increase to a full 13.5 -14.1 and stay there.

on some of the older style alternators at first startup you might see a low reading until the first blip of the throttle which excites the alternator windings which then should ramp up and continue from then on even at idle.

 

[dbrannon79]

The cig lighters read correct voltage on everything Ive used them on

The do read correct, They read the voltage in the cab. but we don't know if there is a difference between the power in the cab vs at the battery. GM did a poor job with wire sizing and connections going into the cab, voltage at the battery can be perfectly fine and in the cab can read low. I have seen this many times on older rigs. his alternator and batteries could be perfectly fine and may have a bad connection or something going on at the main terminal block on the firewall under the hood. Checking with a multi-meter will show this.