Josh, This is certainly not sailing related, but if i remember it correctly, they are all really ammeters (the current flowing through them creates the magnetic field that moves the needle).
Marek Josh Muckley via CnC-List wrote: All analog meters are just measuring the "voltage drop" across a resistance. The key is to have the appropriate voltage input +12v. If the +12v and the sensing line were reversed then the "voltage drop" would be "negative" driving the needle to the empty peg. Josh On Apr 4, 2015 7:08 PM, "Wally Bryant via CnC-List" <[email protected]> wrote: > I thought they were Ohm meters. Anyway, I just Googled it to make sure, > and see a ton of pages on testing marine fuel sender resistance. > > Wal > > you wrote: > >> I agree with your diagnosis. It's gotta be reversed polarity...of the >> sense and gnd. Fundamentally the fuel gages are just voltage meters. >> They >> respond proportionally to the voltage drop across the variable resistance >> in the sender. I would disconnect the leads and use an ohm meter to >> measure and validate the resistance of the senders. Switching the >> polarity >> of the sense and gnd monetarily probably won't break anything. Before >> doing so validate that your wiring looks like the attached picture. >> > > > _______________________________________________ > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > >
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