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Possible short 1999 jeep sport 4.o liter

When i turn my headlights on the brake lights become stuck on all the time. also while the headlights are on the right blinker activates the parking llights and the dash lights. I have replaced the turn signal switch and the head lamp switch. Also can't find a book on the wiring diagram. need help.

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If the jeep has a trailer package, make sure the trailer light connector (back by the hitch) isn't damaged or shorted. It may be corroded too, and causing this.

Posted on Jan 11, 2008


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Blinkers and break lights in 1999 Jeep Wrangler Sport Do Not Work, how do I fix?

well first is the fuse. (if all else works ok, not stated)
no shorted bulbs, they can short. like that. and blow fuse.
the free book is here, see TJ? 1999
see last line WIRING, click that?
id work brakes first, 10x more simple.
see page. ,8w-51-4 (pdf page 134)

see fuse 2? brakes
it feeds brake switch .
id bet the fuse is blown,
if blown remove 4 lamps , blow now, wirnng shorts rear. (hitch hacks)
if not blown check wire, white-tn (tan) for 12v when brakes are applied, if 0v move forward do switch, brake,
the point that has 12vdc on one side and 0v other is bad.
wire, connector or switch.
if voltage is found to be low, that is a short.

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1999 Grand Cherokee at night when headlights are on the right brake light goes off when you apply the brakes

The 1999 Jeep Gran Cherokee has standard all-wheel antilock brakes. The new braking system has electronic brake distribution capability, which makes for a quieter, less pulsing and more balanced braking experience. Possessing the largest brake rotors in the sport-utility segment, the Grand Cherokee meets or exceeds requirements for passenger vehicles, which are stricter than those for light trucks. -----------------------------------------------------------------------------------------
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Mar 09, 2013 | 2004 Jeep Grand Cherokee

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Rear light and brakelight don't work when headlights are turned on 1999 Jeep Grand Cherokee

My first guess would be a ground problem.
The headlights and tail lights are controlled by the same headlight switch, but the brake lights are on a totally different circuit.
You may have to get a shop manual to get the wiring diagrams needed to troubleshoot the circuits if the ground connections are ok.
The lights involve the body computer and other components.

Mar 08, 2013 | 2004 Jeep Grand Cherokee

1 Answer

Brake lights stay on when headlights are on even when I'm not braking. 2001 mitsubishi montero sport

It is possible that you have a bad brake light switch that is sticking. (However, this will usually happen all the time, not just with the headlamps on.)

You MAY have a defective bulb. Sometimes the wires inside a bulb will "warp" from heat and cause a short in the bulb where the tail/brake filaments will touch each other.

Also make sure that all of the tail/brake lamp bulbs are the CORRECT bulbs for the vehicle.

A bulb that is installed incorrectly can also cause this.

If you have trailer wiring on your Montero, this is also a likely source of a short between the tail/brake lamps.

Finally, check the sockets to make sure they are not shorted.

Aug 31, 2011 | 2001 Mitsubishi Montero Sport 4WD

1 Answer

I have a 99 Jeep Grand Cherokee Limited i have brake lights that work when i apply brakes, but as as soon as i turn my headlights on the fuse blows and i have no working tailights with the headlights on. ...

There is definitely a short in the park lights system. Did you just have a radio installed....since the illumination wire sometimes gets grounded and will cause that fuse to blow until you fix that wire.

Aug 17, 2011 | 1999 Jeep Grand Cherokee

1 Answer

Brake lights dont work w/ headlights on

there is a short in the system more than likely in the headlight switch itself causing the problem. not a hard fix just remove the covers from around the column and unbolt the headlight switch from the column and bolt in the new one and see if this fixes your problem also check and make sure you dont have a broken ground at the rear of the vehicle for the rear lights, should be bolted to the frame black wire, generally on driver side.

Aug 28, 2009 | 1999 Jeep Grand Cherokee

1 Answer

1999 Jeep Grand Cher LTD. No brake lights when brake is applied. Brake lights come on when lights are turned on (should be tail lights)Help!

ok check fuses first then replace light in back allot the time one the light will short out the other lights happen on my jeep and honda civic
trash the light in back start fresh see if that works if not dont throw the other light away

Jul 12, 2009 | 1999 Jeep Grand Cherokee

2 Answers

1999 jeep grand cherokee - brake lights and turn signals working but Right tail light out with all other lights on--HELP??? My 1999 Grand Cherokee has no parking lights in the rear. The brake lights work...

I have taken my car to many shops to solve this problem. Long story short your tail light has a bad circut and entire lamp must be replaced. (Lamp cost approximate $130.00)

May 28, 2009 | 1999 Jeep Grand Cherokee

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I have a 1999 jeep grand cherokee and the brake lights wont work

there's a possibility that it might be the socket that the bulb actually goes into. my break light did something similar to that. the socket only cost about 8 bucks from the dealer.

May 08, 2009 | 2001 Jeep Grand Cherokee

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Brake lights don't work. Fuse is good, bulb is good, but brakes still won't come on. GMC Sonoma 1994.

please check your brake light switch located near the brake pedal. it could be faulty.

tnx 4 using fixya,


Sep 24, 2008 | 1999 GMC Yukon

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