Won’t start after trying to install radio

[whiteGIANT510]

Radios are easy enough have you disconnected it and tried to start the cart again? Red wire is your switched power to the ignition or directly to power if you want to use radio without key. Yellow is the preset memory and needs constant power. Black is ground.

[Rosalinde]

Its a workhorse 1200 G, Bought it used, it’s approx 20 yrs old, been running perfect until I installed a new radio. Radio won’t play and cart won’t start now. Battery is fine. Replaced all fuses, in case. Still dead. Help