Re: 1973-1991 Dual fuel tank systems theory of operation
Great collection of info here! Thank you. I'm replacing everything in my '77 dually and only found the dash switch as D7089C, I'm assuming the part number in Post #2 was just a typo.
It doesn't say "DEPRESS FULLY" nor did my original switch. It doesn't behave like a momentary switch, should it? It clicks firmly into either position and there is no center position.
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