GMC Troubleshooting Questions? Ask a Mechanic for Answers
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do you have a good multi meter on hand ?
it could be
it is either the power or ground b ad to the drivers switch or the communication wire possibly bad
if the big red/white wire shows 12 volts with the key ON and the bid black is a good ground then that new switch was not programmed yet with a programming scan tool or the communication wires are bad to it
was the new switch programmed with a programming scan tool to the vehicles VIN number ?
it will not work without the programming installed in the new switch
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