05 supra wont turn over

[fleetpaint]

Working on my friends supra w/ indmar motor. When I turn the key it just clicks, but no start. the bats. are new & fully charged.
it would do this once in a while, but now all the time!....Any Ideas?

[Fiveflat]

Bad ground? or battery terminals...

[strohlde]

starter? solenoid?

[Booms]

Teather?

[fleetpaint]

Thanks guys!...replaced the starter....good to go!!