[Roadsters] temp gauge

[Gary and Cindy Ault]

Oliver,

Graham is correct, you can check the variation in resistance as the engine 
heats up as he indicates.

Is your fuel gauge working properly?  (Both the temperature and fuel gauges 
take power from the gauge voltage regulator -- a little device under the 
dash on the right side of the steering column support.)  If the fuel gauge 
is OK, then the GVR is OK.

Disconnect the lead from the sending unit.  Do you have voltage at the lead 
when the ignition switch is on?

You have a 1600, right?  You need to make sure the sending unit is properly 
grounded.  I think you should be able to get one probe from your multimeter 
onto the shell of the sending unit adjacent to the positive terminal.  There 
should be zero resistance between the shell of the sender and ground.  (On 
2000's the sending unit is in an intermediate housing, and a ground path 
from that housing can be a problem.  You shouldn't have a similar situation 
on the 1600, but the ground could be a problem.

If everything checks out per Graham's notes and my notes, it's probably best 
to just replace the sending unit.  The sender is usually the problem, but no 
point in pulling it out of the head without a few checks.

Gary
----- Original Message ----- 
From: "oliver" <sumton at sbcglobal.net>
To: "Datsun" <datsun-roadsters at autox.team.net>
Sent: Friday, September 16, 2011 8:58 PM
Subject: [Roadsters] temp gauge


> my temp gauge is not reading.
>
> I'm going to really go out on a limb here - doesn't it work by resistance?
> that changes as the temperature changes?
>
> so can't I use a multi meter, connected between power and the sending unit 
> and
> see if it changes as the car warms up?
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