[Roadsters] temp gauge

[Graeme Suckling]

On 17/09/2011 11:28 AM, oliver wrote:
> 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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The sender is a negative temperature coefficient device.
That means it is high resistance at low temperature and low resistance 
at high temperature.
So, if it is still functioning, remove the wire from the sender unit and 
you can use an _Ohm meter_ from the sender terminal to engine ground and 
see the resistance changes as per above.
If the sender reads open circuit or extremely high resistance even when 
the engine is warm, is is probably kaput.
Similarly, you can ground the wire that plugs into the sender and with 
the IGN switch ON the temp. gauge should max out.
Further fault finding will depend on what results you get :)


-- 
Regards,
Graeme Suckling
1965 SP310 Datsun Sports
1971 P510 Datsun 1600
1972 PL510 Datsun 1600 LHD
1973 HS30 Datsun 240Z
1984 B120 Datsun 1200 utility
1993 ECR33 Skyline GTS25t
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