Basslink works in 'on' but not when the engine is running

Check for voltage at the wiper fuse, engine running. Use a testlite to for voltage. If the fuse circuit is hot, it's not the ignition switch.
That fuse circuit goes hot in acc or run.
I just glanced at the wiring diagram.

Must either be the ignition switch itself failed, and/or the ignition relay has failed.

May be the body control module.

Just replace the electrical part of the ignition,that is the first step
proporsche

no your ignition switch is out of adjustment!!!

ignition switch not lock cylinder may need to be addjusted it's on top side of steering column under dash

first red is ignition or acc (turns off and on with the key) yellow is constant power (always hot keeps memory) orange is illumination (lights up radio) if vehicle doesnt have a seperate illumination wire connect it to the ignition wire. now process of elimination your ground is correct because it worked with all wires to acc your acc works because u had all them connected to it and it worked your problem is in your yellow or constant/memory i suggest u test it again take piece of wire any old thing long enough will do and run the wire directly from the battery under the hood and just run it outside the car through the window and connect it directly to the yellow wire make sure u have a good connection at the battery on the positive side if u have test light or volt meter test the wire before connecting it to the radio if it works then u know there is a problem with the wire from the vehicle (fuse wrong wire bad wire ) if it doesnt work make sure ground is connected tight and that paint is cleaned of the surface where ground connects and that the yellow wire to the radio is tight in the back of the radio.

From what i have heard, If you have a speaker level input connection. this sympton does occur. You buy a scosche LOC and try giving the input to Basslink, it should work fine

Definately a wiring issue. Go to this site and backtrack to see where you went wrong. hope it helps.

http://www.ehow.com/how_5829_wire-car-stereo.html

yes the problem is in the installation.the power supply usually has 2 to 3 positives one positive which is usually red go directly to battery. the other,either yellow,orange,or blue go to car stereo(not to battery or ignition) this supply,turn off the amp when u turn of the stereo. hope this help u....