You need to put a voltmeter on your battery terminals, measure the voltage and then start the engine.
You should see the voltage go up to about 14.2 volts or so.
And when I say terminals I mean measure directly on the post, not the cable connector part.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
The coldest winter I ever spent was a summer in San Francisco.