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Re: Coolant circulating?

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Author  [Modern View]

06-19-2013 04:58:07

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I would not trust a voltmeter because a voltmeter will not catch it if the cycle times are fast a voltmeter will throw you a curve ball . A voltmeter could be used to check the ignition side but not the output gauge side.
A test light would show the gauge side pulse (blink on and off)..

It operates more like a circuit breaker it should show a steady pulse if its erratic (on/off) the gauge will be in inaccurate...

If one has a lab scope are a graphing multi-meter it would be top choice... I know you know and you gave great advice my statement was to not let a voltmeter fool ya...

The fuel gauge is a short the voltage regulator breaks on/off depending on the resistance of the fuel sender input. If it does not break the gauge will go up in smoke... The body of the regulator has to be grounded for it to work...

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06-19-2013 17:07:57

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 Re: Coolant circulating? in reply to Hobo,NC, 06-19-2013 04:58:07  
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ding ding ding. We have a winner! The gauge would fly up to red when I turned the ignition on if the instrument cluster was out of the tractor. When I put the cluster back in, it would stay

down. I grounded the instrument cluster with a grounding wire and drove around (it's almost 90 here). The gauge went to half way and stayed put - even at idle. I think it's fixed

I believe the way it was acting was a result of intermittent (or incomplete) grounding.
Thanks for all the help.

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06-19-2013 06:58:43

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 Re: Coolant circulating? in reply to Hobo,NC, 06-19-2013 04:58:07  
The 5 buck multimeters might not catch the pulse but the 400 dollar Flukes will provided you know what to watch for or how to set it's data logger.


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