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Q: Truck will not start. on 2004 Chevrolet Avalanche 1500

i have troubleshot the starter, battery and ignition circuit, when i turn the key i get full power to all accessories, radio works and dash voltage meter reads 12vdc, sometimes when i wiggle the three wires (yellow, black and purple) it turns over, i have tried using a dielectric grease on that connection and it worked for about a week then started again.
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test the battery at the battery I wouldn't trust dash readings if it test good test the starter if the starter just clicks its probly bad
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