I had to change my starter last week, after the tensioner pulley melted on my 2000 catera. After replacing the starter a number of electrical applications are not working right including: Stereo, High beam indicator, sun roof, reading lamp etc.
They all work fine when the ignition is in the accessory position, but when I turn the key to ON or START, they all stop working.
I suppose the circuit opens when the ignition is in ON or START and closes only in the accessory position.

What could have caused this and how can I fix this without spending a lot of money? Is there some kind of switch or link between the accessory and ON/START positions thats malfunctioning?