what battery is the volt meter for

[79 oshkosh 2323]

Is the volt meter on the right side in the dash for both batterys. Mine is in the green but its not in the middle of the green.New batterys. New regulator and brushes in the pass side altenator. Tell me its charging when its just over in the green.

 

[Warthog]

The voltmeter is showing you the charging status of both batteries and alternators. Every meter is slightly different. Kind of like the fuel gauge, just us it as a guide.

Use a multimeter to check the batteries themself and then make a mental note of where the gauge is.

 

[camp9]

The volt meter must be 24v if measuring both batteries?

 

[cpf240]

No, in this case it is a 12v gauge with a 300 ohm resistor across the terminals on the back to form a voltage divider network. Seems to me they should have just used a regular 24v gauge and saved all the trouble.

 

[camp9]

Ok, that makes since. I bought a m1009 that had been changed over to 12v and volt meter dosen't work. Checked the line for power and all if fine so figured must be a 24v gauge. I bet that resistor is bad. Thanks.

 

[Hasdrubal]

This from another member ; The military voltage gauge is really pretty neat. Low red= below 18 volts. Yellow=18-25 volts. Green=25.2-30 volts with the little tick in the green at 28.8 volts. Upper red = above 30 volts. Just turning the key on with good batteries should be in the upper yellow because 25.2 is what two fully charged batteries are supposed to be. This is basically what the yellow/green line shows. The glow plugs pull a lot and will drop the gauge down to mid yellow normally.

 

[camp9]

This from another member ; The military voltage gauge is really pretty neat. Low red= below 18 volts. Yellow=18-25 volts. Green=25.2-30 volts with the little tick in the green at 28.8 volts. Upper red = above 30 volts. Just turning the key on with good batteries should be in the upper yellow because 25.2 is what two fully charged batteries are supposed to be. This is basically what the yellow/green line shows. The glow plugs pull a lot and will drop the gauge down to mid yellow normally.

So if that's the case and the cucv has been converted to 12v, the gauge won't work, or tries to but can't get a high enough voltage to work.

 

[cpf240]

So if that's the case and the cucv has been converted to 12v, the gauge won't work, or tries to but can't get a high enough voltage to work.

Perhaps it will work properly in a 12v converted CUCV if the resistor is removed from the back of the gauge?

 

[camp9]

Perhaps it will work properly in a 12v converted CUCV if the resistor is removed from the back of the gauge?

It's worth a try. I'll let you know

 

[doghead]

I believe the volt meter relay is energized with 24 volts in a stock truck.

Without 24v, it will not work without making some changes.

 

[cpf240]

I believe the volt meter relay is energized with 24 volts in a stock truck.

Without 24v, it will not work without making some changes.

The way I read the wiring diagrams, it appears that the relay is energized via the 12v side of things...