We are installing a GM gear reduction stater on my ZZ383. The shiming looks to be ok but the starter won't disengage after it's bumped over. The motor hasn't been started yet because it's brand new but what I was wanting to know is the starter supposed to disengage after bumping it or will it have to start completely up? It had the purple and yellows wire on it and we only used the purple. We only did this to make sure it was going to work upon start up. Thanks.