Some one did the same thing with my dually they used a toggle switch to acuate it
It sounds like some one did a dual tank conversion or at least a bed change
Im in charlotte if either one of yall need help im pretty familiar with the 73-91 chevys
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Consider your self lucky something knocked a hole in my oil pan causing it to run with out oil and locked up christmas eve 325 hp full roller tbi 350 down the drain thanks to my mother not watching my gauges when she had the truck
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In my friends boneville if you hold the button for more than just a tap it will stop when you let go so im thinking it might work....... gonna have to try it when i do the power window conversion on my dually
sent by telegraph from my k30