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Author
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Topic: Stock temp gauge instantly rises one notch when I turn on headlights
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
 
 
Hi guys, I've been having a problem with my 93 coupe 5.0
Whenever I turn on my headlights, my stock electric temp gauge shows 1 notch higher instantly. And when I turn off the lights, the temp drops instantly, based on the stock gauge. Has anyone seen anything like this before or have any ideas? Bad ground maybe?
If anyone has any thoughts, I'd like to hear them. Thanks.
Luke
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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90gtverrt
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Member # 1437
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posted
Ya sounds like a voltage bleed dude to a bad ground.....trace the headlight wires and make sure everthing is fine and not cracked or shorted out
Mike
Posts: 1199 | From: Livermore, CA | Registered: Jun 2002
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99gt-UJSTLST
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Member # 584
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posted
quote:
Originally posted by fiveohmike:
Ya sounds like a voltage bleed dude to a bad ground.....trace the headlight wires and make sure everthing is fine and not cracked or shorted out
Mike
yup sounds like a short
yoour needle should not move when you turn on/off your head lights
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SOUTH BAY STANGS
MINOR BOLT ON'S
www.southbaystangs.com
Posts: 2558 | From: SAN JOSE CA | Registered: Nov 2001
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
ok, explain something to me...
How in the world does a curcuit like this create a short? Any ideas? And where should I start looking? I can understand an open, but a short?
Luke
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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darien87
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Member # 2022
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posted
Luke87GT, sorry dude I'm no electrician, but this is one of those common Mustang problems. It seems that Ford used voltage regulators that weren't all that great. I had the same problem. I ended up just putting Autometer gauges in my A/C. I never even look at that gauge anymore.
Posts: 206 | From: South Bay Area, CA | Registered: Oct 2002
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Stimson
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Member # 51
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posted
Sounds like a common ground problem. Un-do and clean the following grounds:
-headlights- They're grounded to the radiator support. Very easy to spot.
-battery to EEC to fender- Grounded near the washer fluid fill neck.
-back of drivers side head to firewall-
It wouldn't hurt to pull your headlight switch out and make sure the connector is not melted like mine was. Its very easy to pull out with a small flat head.
Posts: 2373 | Registered: Jun 2000
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