I would start with the starter relay circuit. You will find a bank of relays under the hood. There should be a map either stamped into the plastic cover or printed on the inside of the cover. Locate the "Start" relay, first upon inspection; is it hot, does it appear to have been hot, warped looking, smelling bad, or just damaged? There is also a "Starter" fuse in the fuse block, and an "Ign2" fuse that are part of that circuit, check them all. Back at the relay: Don't ground out that relay, one terminal on it is connected to the E.C.U. and we certainly don't want to fry that, (Very Expensive, and then nothing works). Terminals 85 and 86 of that relay are feed and ground, use a multi meter set to the lowest DC voltage above 12 volts and check only terminals 85 and 86. Check them, both with the key in the on position, and with someone bumping the start position with the key. If there is voltage to that side of the circuit before bumping the starter, then there is a short That smell you smelled is almost always a dead give-away of a shorted circuit, or a circuit that has become a feed-back loop. I am including a simplified circuit diagram that I found online for your starter circuit, hope it helps and good luck. more