I would lean towards the starter, or even the power cable running to the starter. If its near heat, it could have melted or caused cracking on the insulation, resulting in a corroded cable. Heat = higher resistance.
One of the best electrical test tools is a headlight bulb(one of the 4x6/7 rectangular ones). Put a couple of wire extensions off the back. One to the source power, and one to ground. If the light lights up, try cranking it. If the light shuts off, I would go after the cable. If it stays lit with zero cranking, I would suspect the starter.
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