Fuel and temp gauges interactive
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Cross-Country
Joined: May 2002
Posts: 98
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From: Southeastern Virginia
Fuel and temp gauges interactive
On my 1979 F-100, the water temp and fuel gauges appear to be linked up electrically somehow. When the fuel tank is full, the temp gauge reads higher. When the fuel tank is low, the temp gauge reads lower. I put a new fuel tank in it about 6 months ago, so I know the ground at the sending unit is good. I put a thermocouple into the water line leaving the engine (to the top of the radiator) and the temperature is an even 180 degrees F., so I know the thermostat is working correctly.
Any ideas?
Bill Jeffreys
Any ideas?
Bill Jeffreys
New User
Joined: Jan 2008
Posts: 0
Likes: 24
You need to clean the printed circuit board completely.
Corrosion can cause problem like this.
Also, did you install a Gauge Temp sending unit or a Idiot light Sending unit?
There is a difference.
Note the white stuff on the gauge contacts.
This also happens where the ICVR attaches and it can cause erratic gauge behaviour because it sends the pulsing 5v current to the sending units.
Make sure you clean where the ICVR attaches.
Corrosion can cause problem like this.
Also, did you install a Gauge Temp sending unit or a Idiot light Sending unit?
There is a difference.
Note the white stuff on the gauge contacts.
This also happens where the ICVR attaches and it can cause erratic gauge behaviour because it sends the pulsing 5v current to the sending units.
Make sure you clean where the ICVR attaches.
Last edited by Mil1ion; Jan 28, 2007 at 12:25 PM.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Originally Posted by fatherdoug
Like Dennis's picture states, it stands for "Instrument Cluster Voltage Regulator". My original cluster only had two plastic caps also. I don't know if I was missing two or not.
D1AZ-10804-A [ Motorcraft # GR 513 ]
When the gauges fluctuate, this is one of the culprits.
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denjomilay
1983 - 2012 Ranger & B-Series
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Jun 29, 2004 08:39 PM
