Your best solution is to route them away from the exhaust. For wires that have to be really close, you can purchase some Heat Shield Sleeves from your local autoparts store. Other areas, wire loom should be sufficient.
I had this same problem on a Jeep. They make some high heat gasket material that you can get at the auto parts store. I wrapped the wires with a few wraps and secured it with small hose clamps and no more melted wires.
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