Question about 1991 Subaru Loyale

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The gauge temparature goes hi when i switch on headlights

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  • Subaru Master
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Look for missing grounds in the dash

Posted on Sep 09, 2010

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Dashboard lights goes off when headlights are on and the gauges has stopped working


Check the fuse box, might have a bad one, if not, could be the dimmer switch is going bad

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Well the volt meter would drop a notch or two with the extra load of the headlights at idle. But the oil pressure should not change.
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I have installed a trans, boost, exhaust gauges and wanting to hook up to headlight switch to utilize dimming feature of the gauges. I need a constant hot, hot when lights are turned, and dimmer...


Use a 12 Volt test light and determine which wire from your headlight switch is hot when the lights are turned on and which wire goes to your instrument panel lights. When you are probing for the panel lights you can operate the dimmer to make sure the test light dims and you have the correct wire.
If you locate and hook into these two wires your gauges will operate as you desire.

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I have a 1983 Chevy S10 pickup. With headlights off all gauges work normal. When you pull the headlight switch on all the panel lights except the windshield wiper switch locator light never turn on and all...


take a look at the dash ground wire located next to the right of ebrake release handle. if the bole holding the ground wire is loose, which was quite common it will cause all kinds of feed back problems, like described in the comments section to your question.

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I have a 1990 Honda CRX Si. When i drive the car with the headlights on, my gauge cluster goes crazy. Both left and right signal turn on and the hi-beam light turns on. My gas gauge goes to the very top...


Your alternator may be on it's last leg. Start the car and while the car is running, remove the negative cable from the battery. If the car dies, the alternator is no longer working. If you have a volt meter, put the meter on the battery positive and negative. You should read 13.8 - 14.2. If it doesn't show this, and reads under that, your alternator is not charging enough to keep your accessories going.

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My fuel, temparature, oil and odomoter gauges sporadically go out. what is causing this?


I drive a 98 chev 1500 which has simular wireing and components and it done the same thing.Ended uo i had to put in a new ignition switch,not the key switch the actual ignition swich with the circut board and many wires going to it.

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My 2003 Chevrolet Cavalier gas gauge doesn't work. It marks like if the gas was overfulled, it goes in contact with the temparature gauge. What is this problem? Please Help!


Hello. this is caused by a bad fuel level sender in the fuel tank. you will need to drop the fuel tank and replace the sending unit

Jul 05, 2009 | 2005 Chevrolet Cavalier

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96 honda civic lxi overheating.


The car is not overheating if the temp gauge goes up and down by turning the lights on and off.  The gauge is giving you bad information.   You can confirm this by starting the car from cold, sitting in the driveway, let the temp go to somewhere BEFORE normal operating temp, then turn on headlights and fan blower on high, watch the gauge, then turn them off.   If the gauge moves significantly from the electrical load, you probably have a short or a bad ground connection.  

You have a short circuit or bad wiring somewhere in the front half of the car.  I don't know what thermostat switch you have replaced ... but it's not the problem .. stop buying them.  
If you are the original owner, was there an accident that may have damaged some wiring?  If you bought the car second hand,  get a carfax and find out where the thing was hit ... concentrate your wiring trouble shooting in that area.

I think it is something OTHER than the temperature sending unit or the gauge

Oct 28, 2008 | 1996 Honda Civic

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