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Old 08-14-2012, 02:19 PM   #1 (permalink)
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Default power to gauges ?

still a new to me mustang,,, and my first
anyhow,,, none of my gauges work and trying to figure why
i bought a new voltage regulator that i installed to the back of the gauge cluster with no difference
i just checked power to my gas gauge at the tank,,, test light goes on intermittently with a pulse type consistency
tried the temp sending unit with same results
also tried the wire on the oil pressure sending unit and could not get the test light to go on

1969 coupe with original 302

any ideas where my problem might be
i really dont like not having temp and oil pressure gauges
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Old 08-14-2012, 04:02 PM   #2 (permalink)
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pulse is correct. The oil pressure probably won't give you a reading if the engine isn't running (no pressure). try putting your multimeter across the posts on the back of the cluster. Might be missing a ground. Re-test your voltage regulator... wouldn't be the first bad part out of the box I've heard of. Can also try passing a current through the gauges themselves... unlikely, but they are all old and may just be broken.
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Old 11-20-2012, 12:41 PM   #3 (permalink)
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Quote:
Originally Posted by Franks68coupe View Post
pulse is correct. The oil pressure probably won't give you a reading if the engine isn't running (no pressure). try putting your multimeter across the posts on the back of the cluster. Might be missing a ground. Re-test your voltage regulator... wouldn't be the first bad part out of the box I've heard of. Can also try passing a current through the gauges themselves... unlikely, but they are all old and may just be broken.
How do you test the voltage regulator?
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Old 11-20-2012, 12:57 PM   #4 (permalink)
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gas test is OK as you found it. the IVR will give a pulsing IIRC 5-7 volts to that wire.
so your OK there

for the oil Pressure and temp turn the ign to on and ground those wirere for no more then 5 seconds or so. it should peg out each guage. EDIT: do them one at a time

if it does not then it sounds like the wiring, PCB or the guage it self is shot.
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Last edited by Blues Power; 11-20-2012 at 01:01 PM.
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