Hello I am new and bought a 2000 Blazer LT. When I was changing the brakes I had the key to the acc position. It was like 15 mins or little less. The thing just started to turn over like someone is in the car bumping the key a bunch of times. It has happened a couple of times. It also did it while it was running once. any suggestions on to were I should start looking for the short, if it is a short some where. I did a search and did not find anything except people are having problems cranking it. Thanks. sorry had to edit it is on the acc.

 

It could be a short between the ignition and the starter or a bad starter itsself engaging the flywheel or a bad ignition switch

 

I'd start by replacing the starter relay, and then if that doesn't work follow up by diagnosing the ignition switch and wiring like Aquaman said