Re: {Chrysler 300} 1963 Chrysler 300 Fuel Gauge
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Re: {Chrysler 300} 1963 Chrysler 300 Fuel Gauge



Thanks John!

On Aug 14, 2022, at 6:16 PM, John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:

Hi if vr is bad it will cause the temp and oil gauges to act up too .If  VR fails ( it is rare to fail unless wiring is messed with ) it will usually fail full on , all 3 gauges tend to peg  or read very high . That state  can hurt them , burn them out . All except Amps are powered by same VR unit .poor ground of VR device itself will also do that , don’t know about J but dash ground is an issue on FGH . It takes three wires to work , 12 ign supply , a   ground and the output which flicks on and off . Shorting the output wire which runs to all tha gauges or on PC Card will blow up VR 

With ign on put  a volt meter from the temp sensor lead on engine  ( leaving it connected)  under the  hood to ground . You should see a voltage coming and going about every half second with a stock VR . Can’t see it well on digital meter , but easy on analog meter . If you see that fluctuation  and I assume temp ( or oil)  gauge is working ok ,VR unit  is fine .
Tank gas gauge issues are almost always the sending unit, or wire near tank  . the ones sold as “ exact  replacement “ are usually not correct ohms .And the rate of change with gas fill is off .  So you get strange readings . 
Work it if out car in your hand ( ground it ) be sure it touches bottom of tank , if replaced try to get E right , as F does not matter as much . Keep old ones , sometimes can be cleaned and fixed . Never increase force of the little sliding contact on the wire winding , it will tear up the winding . 
Be sure a good ground from the outlet pipe
 To frame . One good way is scrape a clean place on outlet pipe wind 3-4 turns of 14 ga stranded building wire , then put  small SS hose clamp around that winding . Other end to nut and bolt into car metal .
From description of jumping around , if the other gauges are ok , probably bad connection in harness , likely at tank or trunk wire or an intermittent ground of tank issue .
Rusty straps do that  Or sender is in trouble . Good luck , frustrating  … 
Jg 
By the way you can short sender to ground at tank  terminal briefly , the gauge should go to full or beyond . Good test of wiring and gauge and vr .. Do that only if if other gauges are apparently working  



Sent from my iPhone

On Aug 14, 2022, at 6:40 PM, mplindahl@xxxxxxxxxxxxx wrote:



Hello All,

 

Is it possible to test the voltage regulator that is part of the fuel gauge on the 1963 Chrysler 300 outside the vehicle?  I assume the voltage regulator looks like a condenser in the ignition system?  (See Photo) It is attached to the back of the fuel guage.

 

Mine was fluctuating between full and ¾ and bouncing all over the place.  I tried a different gauge and VR, but now I get intermittent readings that are not accurate with a full tank but slightly different than the original gas gauge/VR combo.

 

I am trying to avoid tearing the dash apart only to find out that the VR component may not be working well.  Thank you.

 

Regards,

Mark Lindahl

 

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