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Q:

wont start after installing new battery on 2006 Scion tC

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
will a dead battery in the key keep the car from starting all the gauges and lighrs come on but on start and windows wont work to make things worse i cant even get it into nutral
(1) Answer
No, the key won't affect what you are experiencing.

Sounds like you have a vehicle battery that is not fully charged, or some connections that are suspect. Check for voltage of the battery (12.5 or above), check to see if it survives a load test.

Then, check all cables at all ends from your battery onwards to make sure everything is secure and clear of corrosion.