Hello Friends.
I hope, anyone can help.
My son have a 5,7 liter 2004 gto. Today he tried to start, but nothing. Starter make only trrrrrrt. Only one time. So he bought a new battery. Full charged and install it. Again one try, - the same. I said to him try to hit with a hammer on the starter , but donīt help. But i see, the odometer goes away, getīs brighter and brighter, then come back. Without ignition key , the gauges from temp go a little bit up and down. The RPM Meter goes to 500 Rpm and to zero, the Tachometer to 10 miles and zero. All without ignition.
What could that be?

Greetings from Bavaria Regensburg.