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My engine goes off anytime i turn on headlight

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Posted on Dec 26, 2016


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Saab one headlight won't turn off when I turn if the ignition the light remains on. Only the driver side head light

Some cars leave a light on if you switch off with the indicator/turn light left on. Put the stalk to the "OFF" position and see if it goes out.

Jan 21, 2016 | Saab Cars & Trucks



the headlights will not turn off at anytime, my nob will not turn them off, what can i do to turn them off at my leisure.

on Jul 11, 2008 | 1997 Plymouth Grand Voyager

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I have a 94 chevy dually diesel,and wen i mash the brakes the headlight comes on . when i turn the headlights on by the switch the dash n radio goes off

Sounds like a ground problem. You have many, but the three main ones are, battery to engine, battery to body, and engine to body. After this I would check the grounds from the frame to the body.

Dec 25, 2015 | Cars & Trucks

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98 accord i turn on the headlights , idle goes way down then back up to normal .

alternator is drawing mechanical power from the engine and bogs it down for a moment. No big deal.

Feb 23, 2015 | Cars & Trucks

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Multi faceted electrical gremlin... Headlights (almost) constantly on. Once you turn the on they don't turn off, sometimes after disconnecting the battery they will turn off but not usually. Also, dome...

I love gremlins. ok first thing first. the headlights, you will see a fuse box in the engine compartment near the battery. remove the cover and you will find fuses and relays. if there is no label showing you which is which (look under the lid you just took off), feel them. the one very very hot is the one that controls the headlights (if they are stuck on a the time you do that.) replace that. it should sort out your headlight issue and possibly the interior lights.
now on to the interior lights. you haven't mentioned a blown fuse, i presume you did check them. same thing. check all the relays for one that is very hot, your door would be open anyways so the interior lights will be on at the time. replace that relay.
as a side note the headlight issue could be caused by the daytime running light module often bolted right to the firewall.
Those would be a good start and hopefully slay the gremlins

Jun 14, 2011 | 1992 Buick LeSabre

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Problem with front headlights always going out. It seems like I replace headlight bulbs every 6 mos. on 2002 VW New Beetle.

Check voltage at battery with engine running with a volt meter. Turn all accessories on and lights rev engine up and see if voltage goes above 14.8, if yes voltage regulator in alternator may be your problem.

Mar 04, 2010 | 2002 Volkswagen Beetle Turbo S

1 Answer

2001 Ford Taurus - Check engine light sporadic

what is the battery voltage with no headlights on and car running with a multimeter and your light on the dash on?
what is the voltage at battery with car running and headlights on with a multimeter?
It sounds like it is overcharging,

Jan 11, 2010 | 2001 Ford Taurus

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Engine goes off anytime i slow down or stop

sounds like either you have a short from your resent electrical work..or your drawing to much power from the alt...if its the later, get a bigger alt or try running the radio straight from your battery....make sure you have some way to turn it on and off though;)...more likely its a wiring problem that happened when you changed the system...recheck your wires and make sure they are all in good order..especially the grounds and hots.

Feb 10, 2009 | 2000 Alfa Romeo 156

1 Answer


u can use a headlight to find the short use a old style headlight usually 3 prongs use some 14 guage wire and hook to prongs to head light and run the other end of the wires where efi fuse goes turn key on the headlight will light up as long as there is a short , u can then start wiggle wiring or unplugging engine sensors till headlight goes out when it goes out you have found the short

Nov 22, 2008 | 2003 Toyota Sienna

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