Ground Wires On 2004 Chevy Suburban

I have a two field strip ground wires on a 1999 chevy suburban that has Harness chassis Engine silverado escalade chevrolet tahoe yukon z71 side lm7

I have a two field strip ground wires on a 1999 Chevy Suburban that has

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Can you help identify these mystery wires from under dash?I have a 2004 chevy suburban that intermittently won't crank. it always .