{Chrysler 300} 64 temp sending units

[David Dumais <ddume300@xxxxxxxxx>]

Still fuming over temp gauge.

Voltage regulator signals pulsating.

Replaced temp gauges again. One registered then went back to below C

Violet wire from pin connector to sending unit works.

Cleaned PC board and pin connections.

Checked Ohms on spare temp units ,all Uninstaller.

 .41, 

.31 and 160.1 Ohms 

With ign key on:

With gauge installed into console ,test lamp lights Brite on fuel gauge I  , blinks on S terminal.

Temp gage  pulses on both terminals

Switch gauges and unit again?

Dave D

On Thu, Jun 25, 2026, 5:05 PM Rich Barber <c300@xxxxxxx> wrote:

I like to test the temperature sensor by measuring resistance while inserted into boiling water.  Alligator clips to hold the sensor and connect to the analog Ohm meter.  Use the Pyrex measuring cup and stick a thermometer in the water.  Watch the change as the water cools  Not real linear outside the operating range.  I forget the resistance but it might be given as Ohms at temp.  Just like back in ME lab.

 

Rich Barber in hot, dry Brentwood.

 

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of David Dumais
Sent: Thursday, June 25, 2026 8:32 AM
To: Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>; Donald Verity <chryslerdon@xxxxxxx>; Bob Merritt <bob@xxxxxxxxxxxxx>
Subject: {Chrysler 300} 64 temp sending units

 

I have 3 sending units that thread into

W/pump housing.

 

No China or US stamped on any.

1 is stamped 250 with KS j3, 

 

Another has no stampings.

 

And one has KS B4 and 250 all stamped

Twice .

 

All stamping are on hex faces .

 

Any thoughts on correct unit for the 64

Application?

 

Also, the voltage regulator stud has the copper ribbon squeezed tightly to it

 

I have to remove cluster again to verify

It.

 

I used the 12 volt needle test light between sending unit and the plug on end of violet gauge wire.

 

It flashed intermittently and not a steady light signal

 

NOS temp gauge not registering yet.

 

All pins and board copper have been gently cleaned. 

 

Any thoughts?

 

Thanks 

Dave D

 

Thanks Dave

 

 

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