The family purchased a Firestone Indy Lights Series Dallara chassis in mid-2008 and he made his debut in the final race of the season at Chicagoland Speedway.
He competed part-time in the 2009 season with the team being run in conjunction with Davey Hamilton and Kingdom Racing.
Wagner made his 2010 debut in the Freedom 100 with Davey Hamilton/Kingdom Racing where he captured his best Indy Lights finish of 8th.
The team continued running a partial season of ovals, similar to the schedule they ran in 2009.
On October 2, 2010, Wagner captured his first win in the Firestone Indy Lights Series at Homestead Miami Speedway after passing polesitter Pippa Mann at the start and dueling with James Hinchcliffe for much of the race.