Had an incident on the combine this evening . A small oak branch had landed on top of engine and set fire which in turn set fire to the wiring harness by engine. Luckily we put it out but kept about 12 wires fused together. We pulled them all apart and now need to recover them . Most about 5 inches long where copper only showing . Wires not broken so can’t slip over shrinking tube. Electrical tape just tends to go brittle when hot . What’s best option.? Thanks