assuming it is a Mopar truck you are talking about if it is ald enough to have an Amp gauge it could be bad .reach up and tie the wires together bypassing gauge .On older Mopars everything electrical has to pass through the amp gauge ,DAVE
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"been there, done that, ruined the T-shirt".
2007 LBZ GMC Sierra, ECSB
2006 LM7 RCSB Silverado
98 Vortec project.
94,3500,6.5L 4L80
81 SWB GMC POS finally gone 
73 Pinto, stock, w/CragarSS's-eww 
LOTS of Cummins trucks.
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