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2003 Silverado 2500 hd diesel, won’t crank.

I replaced the steel brake lines on my truck today. Now it won’t start. The batteries went dead while we were bleeding brakes. (Son has the radio on). Charged batteries and cleaned corroded connections

The dash lights up but the warning icons don’t light up. Headlights come on and radio works.

I have searched and found a few posts relating to wiring problems. I have traced back as far as I can in the looms along fender liner and frame to abs pump.

When I scan for codes there are a couple of low voltage codes and pretty much every transmission code available,I think.
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