Re: no power to starter
Ignition key have a resistor chip in it? The VATS module is located under neath or at the pass side toe board or kick panel.
If chip in key is not recognized by VATS module, then theft relay will not energize. There is a connector on column and two small gauge wires, white?, with key chip resistance to VATS module. If key is not read, usually because of key socket in tumbler, is not making contact with key. You should see with your meter the resistance value of the key chip. This key resistance value is compared inside VATS module and if a match is found, relay energizes, engine starts.
I think, yellow wire is relay power and yellow/black wire is power return. If you find ne resistnace from key socket, then you will have to have key tumbler changed. It requires steering wheel removal to change along with locking plate removal and turn signal removal and fishing of new wires from the same column connector at the bottom of the column.
But before you get the part, er, tumbler from any GM dealer, you need to show proof of ownership. Torx screwdriver is needed also. Study up from the Haynes manual. Tools to do the job can be bought from Harbor Freight for under $30. Patience is also needed.
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CUBS - 2016 World Series Champions - maybe this year, 2019 ...