Question about 1986 Jeep Cherokee

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Electrical issues i have no lights

I have running lights but no low beams only high beams. when i turn anything electrical on my voltage gauge goes way way down. my alternator is good so is my battery.

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Sounds Like A SHORT in HeadLight Switch

Posted on Jun 02, 2009

  • Ronnie Wilson Jun 02, 2009

    Sounds Like A SHORT in HeadLight Switch

  • Ronnie Wilson Jun 02, 2009

    Sounds Like A SHORT in HeadLight Switch

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Posted on Jan 02, 2017

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2007 chev sub head lights wont turn on


Do you know anything about automotive electronics ? Electronic control modules .
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch on input circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.
If the headlight switch is left in the ON position, the inadvertent power control feature will turn OFF the headlights approximately 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until turned OFF or the battery runs dead.
The high beam indicator is illuminated when the instrument cluster receives a GMLAN serial data message from the BCM that the high beams are illuminated.
High Beams
The high beam headlamps receive voltage from the headlamp high relay located in the underhood fuse block. The BCM controls the relay on the headlamp high beam relay control circuit. High beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is grounded, the BCM grounds the headlamp high beam relay control circuit, illuminating the high beam headlamps. The right and left high beam circuits are independent and are fused independently in the underhood fuse block.
Low Beams - Standard
The low beam headlamps receive voltage from the headlamp low beam relay located in the underhood fuse block. The BCM controls the relay on the headlamp low beam relay control circuit. Low beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is open, the BCM grounds the headlamp low beam relay control circuit, illuminating the low beam headlamps. The right and left low beam circuits are independent are fused independently in the underhood fuse block.

Hooking up a factory scan tool an checking DTC'S - diagnostic trouble codes would be the very first step in trouble shooting this problem .
DTC B257A 00: Headlamp Switch Input Signal Mismatch
DTC 2575 00: Headlamp Control Circuit

Jun 30, 2017 | Cars & Trucks

1 Answer

Driver side low and high beam on but dim. Passenger side low beam normal but high beam on and dim


I would check for the groundwire continuity

Driver side - dim low beams and no hi beam - Subaru Outback ...

www.subaruoutback.org > ... > General > Electrical & Electronics
Oct 11, 2014 - Hi everyone, My drivers side headlights are dim on low, (car has separate bulbs ... When the headlight switch is turned ON, but for low beams, ...

Driver-side Low beam Not Working (electrical issue not bulb ...

www.hummer4x4offroad.com/.../showthread.php?...Driver-side-Low-be...

Mar 12, 2015 - 10 posts - ‎4 authors
The high beam continues to work on both sides...I pulled the Driverside headlamp fuse and then both left and right beams lit up but very dim.

High beams ok, but not low beam - one side only - TDIClub Forums

forums.tdiclub.com > ... > VW MKIV-A4 TDIs (VE and PD)
Jan 23, 2014 - My driver's side lights are working fine - high and low beams. ... But it definitely looks like the big lamp on the driver's side gets brighter when ..... Drivers side headlight is very dim on low beam and goes out when on high beam ...

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Jan 04, 2016 | Cars & Trucks

1 Answer

My high beam light is flashing on and off in day but when I turn the lights on it goes off. Also, I now have now day time running lights.


Daytime running Light module is overheating / it reduces power to low beam to create daytime running light . Ask yourself do I need this - If no law against it = UNPLUG control module . Your low beams will operate normal by turning on switch - Lever / Turn switch will turn on Highbeams but this switch can be Lose internally and Only cure is replace Signal Light Steering wheel switch . Common issue for all Cars is switch stalk / Lever is worn out by Aggressive use. If your car has Automatic light control - re they turn off after 30 second delay when you exit car - Try putting switch in manual mode means you Turn on - off by switch . But I really feel signal stalk is worn . DRCM is a known issue that can be unplugged . Final cheap solution unplug both high beams an Drive on low beam . $$$$$$$ spent chasing small problem will destroy $$$ needed for Bigger issues .

Jun 30, 2014 | 1996 Pontiac Grand Am

1 Answer

One low beam wont turn on, but both high beams will


ok if you run a power wire to the positive on battery does it go?
if so its a plug or cable issue. if not make an earth wire for the earth side of light and try the power again. if it goes you have a bad earth.

Dec 29, 2013 | 1997 Chevrolet Blazer

1 Answer

Minimal low beams on one side, no high beams on one side subaru


What year and model is your subaru ?

Is it a singe ground issue? Fuse? ?????????? Without doing some testing we would be just guessing. You need to test the electrical circuit to know for sure . Voltage drop testing !
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Electric Testing Techniques You Need to Know
You need a wiring diagram so you know what wires to test . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , make , model and engine size . Under system click on lighting ,then under subsystem click head lamps . Click the search button then the blue links. Look at the wiring diagram to see what all is involved in making the head lamps work .

Aug 13, 2017 | Cars & Trucks

1 Answer

Both low beam headlights are out.


check for voltage at the high beam switch when high beams are turned on.

Oct 08, 2012 | 2004 Ford Focus

1 Answer

I have a 2001 dodge ram 1500. does anyone know anything about the headlight wiring?I would like to know how it works. Currently , i know the violet wire is 12v constant and the vt/wht wire is ground when...


Well, where to start...
First there are 4 different headlamp systems available for 2001 Dodge Ram 1500.

> WITH Daytime Running Lights and WITH Quad Headlamps

> WITH Daytime Running Lights and WITHOUT Quad Headlamps

> WITHOUT Daytime Running Lights and WITH Quad Headlamps

> WITHOUT Daytime Running Lights and WITHOUT Quad Headlamps

So providing you with an EXACT flow chart of what happens depends on which system your truck is equipped with.

However, the general jist of it goes like this:

The Violet wire you mention is your power feed to the bulbs (high beam and low beam elements) from the headlamp fuse (HOT AT ALL TIMES). The dimmer switch basically determines which of the two headlamp elements is going to get grounded to complete the circuit. When the Violet/White wire gets grounded, that is low beam. When the Red/Orange wire gets grounded, that is high beam.

Just a little "Automotive Electrical Systems 101":

Your Headlamps work just like ALL automotive electrical circuits. The power goes from battery POSITIVE to battery NEGATIVE in order to complete the circuit. PERIOD! Every circuit on your vehicle is as simple as that. If you take a closer look at the wiring diagrams, you will see this.

Apr 10, 2012 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

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.

Dec 11, 2010 | 1983 Chevrolet S-10

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