Re: [AMC-list] More Electrical

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

Ken' right I think.  Jim the tank sender doesn't acually have a power wire going to it.  The gauge picks up return current from the ground circuit of the car.  The resistance produced by the sender mechanism changes the voltage (read as fuel level) shown on the fuel gauge.  So what you were evidently reading with your volt meter was the 5-volt nominal reference voltage produced for the guages.  It's produced by a primitive convertor with start/stop action to produce an average of 5 volts.

Joe Fulton

--- On Sat, 3/13/10, Ken Ames <ameskg@xxxxxxxxx> wrote:

> From: Ken Ames <ameskg@xxxxxxxxx>
> Subject: Re: [AMC-list] More Electrical
> To: "AMC, Rambler, Nash, Jeep and family" <amc-list@xxxxxxxxxxxx>
> Date: Saturday, March 13, 2010, 10:36 AM
> At first glance this looks like the
> dash voltage regulator is working as it
> should. The on-and-off puts an average 5 or so volts to the
> gauges which is
> correct, AFAIK.
> 
> Ken
> 
> 
> Quoting feltonjk@xxxxxxx:
> 
> > More in my continuing saga of restoration of my 70
> AMX.  Just got my gauges
> > back from the shop, all gauges (temp/fuel) all lights,
> circuit board etc.
> > have been checked and verified to be working. 
> New fuel sending unit
> > installed a couple of years ago.  The sending
> unit is grounded to clean bare
> > metal.  I thought I put in a new temp sending
> unit but am not 100% sure. 
> > When I put a check light on the temp sending unit wire
> and on the fuel
> > sending unit wire, the check light lights up
> indicating power through the
> > harness to the connectors, but the test light blinks
> like a signal light!  It
> > would appear as if I did something wrong somewhere
> along the way.  Have any
> > of you run into this?  Help!!!!
> > 
> > 
> > Jim
> > 
> > 
> > 
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