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Gauges go south when the vehicle gets hot 

 

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 Post subject: Gauges go south when the vehicle gets hot
Posted: Fri Nov 18, 2005 10:47 am 
Fordmods Newbie
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Joined: 15th Jun 2005

Location: bentley
WA, Australia

I have a 1996 EF Fairmont Ghia and when the vehicle gets hot after working hard (towing) the voltage gauge drops below 12 volts, the oil pressure reads almost 0 and the fuel gauge drops about 2mm.
Has been doing this for the last 60000 ks so its not low on oil pressure and it goes up as soon as you turn of the air but it sometimes brings on the oil light at idle and it scares the living out of the misses.
Any ideas.
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Posted: Fri Nov 18, 2005 9:48 pm 
Parts Gopher
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Joined: 31st Jul 2005

Location: auckland
New Zealand

sounds like you have a earth problem
check earths under dash and at battery
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 Post subject: Gauges go south
Posted: Mon Nov 21, 2005 12:40 pm 
Fordmods Newbie
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Joined: 15th Jun 2005

Location: bentley
WA, Australia

Thanks for the info, got the same info from a Ford dealer.
Removed the dash cover for the central dash earth and found Ford had trapped a layer of insulating material under half the lug. Seems much better although have not done any towing.
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Posted: Mon Nov 21, 2005 1:09 pm 
Getting Side Ways
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Age: 36

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Joined: 5th Nov 2004

Ride: Falcon

Location: Melbourne
VIC, Australia

Yeah I used to have the same problem when the fans kicked in (obviously when it got hot) and it turned out to be the fans and the headlamps shared an earth that had some grime under it. cleaned it up and no more probs.

 

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