Is this normal ?

[camarors8992]

The voltage on my jeep drops way low when I have my heat on high. If I have my rear defroster, heater on high, headlights on and fog lights the voltage drops to about 9volts. If I just put my heat on medium it will come up to a little below 12 and if I turn it off it goes up even further, no matter if my fog and reverse lights are on.

[Matthew Currie]

Yes, it's normal. The voltmeter lies when the heater fan goes on high. You can double check that everything is normal by taking a reading at the battery, but it's a very common thing and generally nothing to worry about.

[RandyD71]

It's normal at idle to have the factory gage be pessimistic. It should come up once you are off of idle speed though.

[serialphreak]

Yes, it's normal. The voltmeter lies when the heater fan goes on high. You can double check that everything is normal by taking a reading at the battery, but it's a very common thing and generally nothing to worry about.

x2 mines the same way but if u actually test battery voltage its normal.

[camarors8992]

yes it alwats goes back up. thanks guys !