If all other lights are bright...Like Jeepster said check grounds and all connections, firewall feed-through, along LH frame rail and at last crossmember feed-through connector. Clean connections once you've found the problem and apply dielectric silicone grease inside connectors before re-assembly. Make sure all grounds are down to bare metal.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.  
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