Q: cycles start/stop when switch first hits Run position on 2003 Chevrolet Silverado 2500 HD

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
03 Silver. 2500HD 8.1. instantly cycles start/stop at 3 second intervals when key initially hits Run (not Start), but doesn't start, just cycles. Can start and run by pushing key hard past Run to Start, then it starts. Problem started after dead battery tries, and new batterey installed.
(1) Answer
It sounds like there's a problem with the ignition switch and lock assembly but I can't say I understand the question exactly. Tow it, or drive it if it runs, to a GM specialist or dealer, there have been some problems with the anti-theft systems in these vehicles, but I don't think that's what you're describing.
If you want to find a specialist, here's a directory link for you:
Didn't find what you were looking for?