[DMCForum] Re: Idiot light check
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[DMCForum] Re: Idiot light check



Forgive me Martin, but are you sure you're right on this? Other fuel 
sending units I've worked with operate like this:

As the float rises, resistance -decreases- (shorts) allowing more 
power to the gauge, hence the needle rises.

As the float falls, resistance -increases- (open) reducing power to 
the gauge so the needle falls.

So, as far as I understand it, I have a short, or full power to the 
gauge because the needle pegs "full".

If I had an open, the needle would always read "empty".

I can see why it's confusing, because float goes up, resistance goes 
down, and vice versa. It's opposite of what most people expect.

When the sender is unplugged, the power wire is shorted to one of the 
other wires somewhere, still sending a full voltage to the needle 
because there is no sender to put any resistance on the line and 
lower the needle.

Now, how about those idiot lights? Which ones come on for test when 
you put the key to "run"? :)


--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <webmaster@xxxx> 
wrote:
> That's what it does when open circuit, hence unplugging makes no 
difference
> 
> cruznmd wrote:
> 
> >2. Fuel gauge pegs full (wiring short. Does it even with sender 
> >disconnected)
> >



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