Enrique - this reply is to the personal mail as well.
I suspect it was a typo but the green/blue should go from the sender to the
gauge, not to the stabiliser. There should be a light-green/green from
stabiliser to the other side of the gauge.
Don't know about the electric temp gauge but on the fuel gauge it is not a
good idea to fully ground the sender wire as this over-drives the gauge. My
fuel sender shows about 35 ohms at max, I would expect the temp gauge and
sender to be similar. '0 ohms' can be misleading on an analogue meter if the
scale goes up to 10,000 ohms, you really need a digital meter - is that what
you used? From all your tests it really does seem to me that you either
have the wrong sender. Maybe it does show 0 ohms on the miniscule current
the meter drives through it, but as soon as you try to make it carry the
much higher current required by the gauge its resistance goes up. Try
putting a voltmeter from the junction of the green/blue and sender to
ground, grounding the sender body and turning on the ignition. You should
see about 10v. Now start heating the sender, what does the voltage do?
Try switching the green/blue off the temp gauge onto the fuel gauge and
vice-versa. What happens now? If the temp gauge shows the correct fuel
reading and the fuel gauge shows nothing when the engine is hot then that
indicates the gauges themselves are OK.
PaulH.
----- Original Message -----
From: E.Claure <spanlab@ceibo.entelnet.bo>
To: <mgs@autox.team.net>
Sent: Monday, November 06, 2000 5:31 PM
Subject: Bad Temp Sender III
> Hi list, I really dedicated time to my temp gauge today to see why I don't
> get readings. First I took a look at the gauge and after shorting the
> green/blue wire at the sender the gauge moved past mid of the scale. While
> the temp gauge was still shorted I disconnected the green/light green
> cable from the voltage stabilizer and both the fuel gauge and the temp
> gauge stopped working. I then connect the cable back and both gauges
> worked. I also disconnected the green/blue cable from the stabilizer with
> same results. I then grounded the new temp sender and heated it up until
> my ohm meter read no resistance 0.000. I connected the sender to the
> green/blue cable and looked at the temp gauge. The gauge started to rise
> but ever so slowly and just above the blue mark. I heated the sender quite
> a bit with a lighter so it really got hot.
>
> I then put the sender back in and took the car for a major spin so it wood
> get nice and hot. Got back poped the hood and read the senders resistance
> 0.000 to my surprise the gauge did not move at all.
>
> I checked all connections to make sure there is no loose spades or rust.
>
> My conclusion is that both the gauge and sender work but the sender is
> sending current at to high a temperature thus the gauge moved when I
cooked
> the sender with a lighter. I also noted that when I was reading the
sender
> with the ohm meter and reconnected the sending wire the readings started
to
> pulse up and down but I understand this is what is supposed to happen.
>
> The sender is marked on its side 101 , K914, GTP. What is the correct
> rating for my sender or what else can I do? Thanks again for the input.
Enrique
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