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...Verify that all of the following grounds exist and are making good electrical connection by taking the connections apart and sanding to bare shiny metal - recommended cable sizes are in parentheses. When you're done cleaning, coat the connections with anti-oxidant as you assemble them:Battery-to-engine (4 gauge is typical, 2 gauge is recommended)Battery-to-right frame rail (10 gauge)Battery-to-radiator support (10 gauge)Engine-to-left frame rail (an optional ground) (10 gauge or 5/16" braided copper strap)Cab firewall-to-back of right cylinder head (10 gauge or 5/16" braided copper strap)Instrument panel and cluster grounds-to-cab sheetmetal next to the parking brake pedal assembly (various gauges ranging 18 to 16 gauge)