[Roadsters] Gauge voltage regulator troubles.... VR bench tests, but gaug...

[Keith0alan at aol.com]

Try checking the gauges. Remove them and with your variable power supply
vary the voltage going to the gauge. It should peg about 6 volts. Also, if
you  ground the sensor wire that gauge should peg. The system is pretty
basic,
 battery to regulator to gauge to sensor to ground. At this point pull the
sensor  wire loose and ground it. That will do an end to end check of
everything but the  sensor. If the gauge pegs then the sensor is the problem.
If
not it is the gauge  or wiring. Test the gauge and you will be down to
wiring.

keith  williams
ccfcccs
_http://www.clarkcountyferalcats.org_
(http://www.clarkcountyferalcats.org/)

bIf  Not Us, Then Who? If Not Now, Then When?b


In a message dated 7/22/2009 5:32:53 P.M. Pacific Daylight Time,
stamuki at gmail.com writes:

I  cleaned up my gauge voltage reg and re-installed it.  This gave me  a
credible gas reading, and no temp (but I was sitting in the  driveway
not running).  So, I went for drive to warm the engine and  fill the
tank.  The temp may have risen a little but it stayed below  the lowest
line.  I then filled the tank and it didn't change the fuel  reading
(just under 1/4).

So, I bench tested the VR and it seems  fine:  Starts at source
voltage, holds for a few seconds then pulses  between ~0V and 10.5V
(where I had the power supply set).

Put it  back in the car, tried it backwards to confirm that wasn't  the
problem.  OK.

I then bypassed the VR by simply pushing the  ignition and gauge leads
together: no movement from temp, fuel rose to  about 60% full then held
there.

Any ideas what this is telling  me?  I would appear that the
temperature gauge itself may be dead, but  why the partial operation of
the fuel gauge with a seemingly functioning  voltage reg?



--
Dave Riedel
'69 2000
Victoria,  BC
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