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  Auto Meter H2O guage jumping! ???

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Author Topic:   Auto Meter H2O guage jumping! ???
460-67Stang
Gearhead

Posts: 136
From: Southern Ohio, USA
Registered: Feb 2001

posted 08-25-2001 10:31 PM     Click Here to See the Profile for 460-67Stang   Click Here to Email 460-67Stang     Edit/Delete Message   Reply w/Quote
I installed an Auto Meter water guage in my '67 and am running it using the stock wiring and a new sending unit. For some reason it shows the temp for about 10 seconds then goes to zero. It then constantly jumps between zero and the original reading. Takes about 1/2 second for it to show the temp and go back to zero.

It's almost as if a circuit breaker is popping and resetting. I've checked all connections and they appear OK. Any ideas?

Thanks!
Brian Bulow

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franklin
Gearhead

Posts: 128
From: VA
Registered: Nov 2000

posted 08-25-2001 10:54 PM     Click Here to See the Profile for franklin     Edit/Delete Message   Reply w/Quote
Most Fords have an instrument cluster regulator that regulates the voltage to the guages. I believe this "regulator" actually turns the voltage on and off to keep approx 5 volts to the original guages. I guess the originals are so slow, you don't notice when the voltage goes on and off. To test my theory, find a 12 volt source (or whatever Autometer recomends) different from the original guage and see if it fixes it.

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460-67Stang
Gearhead

Posts: 136
From: Southern Ohio, USA
Registered: Feb 2001

posted 08-26-2001 09:22 AM     Click Here to See the Profile for 460-67Stang   Click Here to Email 460-67Stang     Edit/Delete Message   Reply w/Quote
Thanks Franklin. I wasn't aware of the regulator. I'll bypass it and see what happens. I'll post the results here.

THANKS!
Brian

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460-67Stang
Gearhead

Posts: 136
From: Southern Ohio, USA
Registered: Feb 2001

posted 08-26-2001 06:51 PM     Click Here to See the Profile for 460-67Stang   Click Here to Email 460-67Stang     Edit/Delete Message   Reply w/Quote
Franklin,
You were correct. I did some further reading in a manula I have and it turns out the factory guages are fed 5 volts in short bursts. The voltage regulator takes 12 volts and sends short bursts of 5 volts for about 1/2 second each. Like yuou said, the factory guages don't show this, but the auto meter sure did!

I ran 12 volts to the AM guage and it works super!

Thanks for the help!!

Regards,
Brian

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