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Q: 4wd inop on 2002 GMC Sierra 2500 HD

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
4wd inop disconnected batterys and reconnected no change put in new dash switch no change, dash switch not lighting up service 4wd light comes on
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