I think as John had mentioned, it looks like someone has added some wires, the grey sleeved cable with the white and black wires. These most likely go to a a/c pressure switch. Have a look at Mike Dailey's excellent write up and this might be those extra wires. PanteraPlace
If this is what you have you can temporarily connect the 2 wires together at the pressure switch. Do not run it for long like this, it most likely means you are low on ac refridgerent.
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