02' Z28........HCI if it matters.

Car seems to run fine but the volt gauge in the cluster is very erratic. Cranked it earlier and its showing around 9V. Sometimes it shows 13. I get an occasional TPS low voltage code and it seems to be when the volt gauge is showing on the low side.

Any ideas?

 

i see a truck alt in your future........

 

Get your alternator checked and also check if there is any damage to the exciter wire that plugs into the alternator.