I'm resending this to see if it gets through to the list this time after Bob
helped me understand what was happening to my posts.
----- Original Message -----
From: "Craig Kruse" <cmkruse@hughes.net>
To: "Charles Hosang" <hosang1@earthlink.net>; "oletrucks"
<oletrucks@autox.team.net>
Sent: Wednesday, September 27, 2006 11:22 AM
Subject: Re: [oletrucks] Gas Gauge
> Charles,
> One way to just check the gauge is to connect the sending unit wire
> (disconnected from the sending unit) to a 90 ohm variable resistor
> (potentiometer or rheostat is the electrical terminology) and to chassis
> ground (this uses the variable resistor to replace the sending unit) and
> then increase/decrease the resistance to verify gauge indications.
> Sending units are either 30 ohm or 90 ohm depending on your year of
> truck or aftermarket replacement unit. If you don't know the resistance of
> your unit the 90 ohm rheostat (radio Shack item or local radio/electronic
> repair shop) will cover both scales using only a portion of the variable
> resistors capacity. '0' ohms is empty and moving toward '30' ohms
> resistance increases the reading to full on a gauge that uses a 30 ohm
> sending unit and continuing toward 90 ohms will increase the reading to
full
> on a gauge that uses a 90 ohm sending unit. Don't overshoot the full scale
> if you have a 30 ohm unit and are using the 90 ohm rheostat.
> The variable resistor can be connected in the circuit at the
instrument
> panel by disconnecting the sending unit lead from the gauge connection and
> connecting the rheostat or at the sending unit connection by disconnecting
> the sending unit wire connecting it to the rheostat and the other
connection
> to chassis ground.
> If you already know your sending units resistance you can obtain the
> matching value variable resistor.
>
> Craig / 49Panel
>
>
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> "Do or Do Not - There is no Try" Yoda - Jedi Master
> ----- Original Message -----
> From: "Charles Hosang" <hosang1@earthlink.net>
> To: "oletrucks" <oletrucks@autox.team.net>
> Sent: Tuesday, September 26, 2006 4:00 PM
> Subject: [oletrucks] Gas Gauge
>
>
> > My gas gauge on my '51-53 doesn-t work; reads E all the time. Pulled
the
> repro sending unit and with an ohm meter found out it is bad. Two
> questions. First, if the sending unit was or went bad, could that have
> affected the gauge itself or the resistor (12 vol;t system) ? Second, is
> there a way of checking the gauge without having a sending unit in the
tank
> by using an ohm meter or voltage meter? I have a write up from
> Chevytrucks.org but it is not clear to me on these two questions. Any and
> all help would be appreciated.
> >
> > Charley
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