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The low-beam light on my 2007 I-290 is very dim. I replaced the bulb but it had no effect. I was told that it probably was a bad ground. Where would it be grounded?

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  • 49 Answers

Test the voltage at the light fixture connection with a multi meter, follow the wire back until you find 12 volts again, check the ground on the battery, follow the ground to see if there are any damaged connections along the way, check the bulb seat for grase or corrosion, you can use break cleaner and air, dry fittings before connecting, sometimes wires get loose in the plastic connectors, you do not have to buy the complete connector, tell the dealership you want the inserts that go into the connector, usually you can get a wire with the end already on it and a little tool that pushes the old one out, insert the new one and connect the wire, sometimes it can be inside the wiring harness but you can always bypass a wire as long as you know where it ends up, just use the same size and type of wire and protect it with the right wire loom

Posted on Dec 13, 2014

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Posted on Jan 02, 2017

Mike258
  • 1498 Answers

SOURCE: Lo-beams not working

Hi manolonusa,

It may have something to do with your headlights, but my first thought is they are just a symptom of another problem.

I'd check on the alternator. If the ALT fails, a good battery will keep the car running for quite a while. Sometimes the first symptoms are the dimming of the headlights. So:

  • Make sure belts are tight.
  • Get a meter and test the output voltage while its running (be careful when doing this).
  • Check the voltage at the battery when stopped and when running.
  • Same thing with headlights on and off.
Get back to me with the results. Once the alternator is ruled out we can check a possible headlight problem. But this way, at least you won't be stranded somewhere with a dead battery.


Posted on Sep 08, 2008

c17hydro
  • 2984 Answers

SOURCE: 98 volvo S70 low beam bulb replaced still no light

Easiest way would be to go back to where you bought it and make sure the bulb is installed that you bought....and show them. Ask if you can get a new bulb and change it in front of him. Call the dealership and talk to parts, ask if, indeed the hi and lo are interchangeable.

Posted on Mar 12, 2009

  • 2002 Answers

SOURCE: 2002 Dodge Ram 2500 Driver's side headlight dim

If the ground is good I would take a careful look at the light socket itself. There may be corrosion inside or on the power wire where it goes into the socket or it may just be making poor contact.
You can get a replacement one at any auto parts store. The last one I got was about $10. Get some heat shrink tube to cover your splices, it does a much better job of sealing the splice than tape. Hope this helps.

Posted on Aug 14, 2009

wracefans24
  • 1985 Answers

SOURCE: Left headlight is dim - like it has a bad ground.

i think you hit the nail on the head with the ground problem,if you remove the bulb from the head light assembly,wiggle the black wire to see if the bulb gets brighter,if it does remove the bulb and clean and tighten the ground wire end.if it does not get brighter from a wiggle,connect the ground end of a test light to the positive post of the battery and probe the black wire,test light should light,if so replace the light socket.

Posted on Nov 26, 2009

  • 7 Answers

SOURCE: my son's '01 3.2 Cl low beam headlights put most

read the owners manual and look under lights it will tell you how to adjust them

Posted on Jan 22, 2010

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1 Answer

I have a 2004 Mitsubishi endeavor dim lights won't work brights do


If both low beams don't work, check for a low-beam fuse. Sometimes they hide them under the hood. If it's just one low beam, it may be the plug on the bulb or wiring to the bulb, even a bad ground wire to the bad bulb. Look for crispy wires or dark bulb terminals. Sometimes the terminals or plug will have green stuff on it, similar to what you find on the (+) terminal of the battery. They sell bulb terminal grease to help prevent this. Toodles.

Jan 25, 2017 | Mitsubishi Cars & Trucks

1 Answer

Head lights dims out


old post day, Geo underdogs.
is engine running, seem yes, pretend yes...
high and low beams dim (means weak not low or high beams)
dim bulbs. all elements, left and right sides?
well first is battery voltage
use a $10 walfart DMM meter., (set to volts)
13.3. to 15vdc is the voltage running, on a hot engine rpm is 700+
RPM not 400. so, if all that is good, the ALTERNATOR IS doing its job, yes, the regulator is inside the alternators and changes voltage , by SENSING batteries needs, and sensing driver added loads, (accessories)
so if battery voltage is good, the what is it,
well that is easy head lamp failure
got DRL do you have the infamous, and pesky DRL daylight running lamps as the law requirements in CANADA,
next time say DRL or canada, ok?

if all lamps are dim on the HL,
the the ground to them are bad.
there are 4 bulbs , 2 high 2 low, all for dim is bad ground there.
the Headlamp relay sends 12vdc to all 4bulbs, and most read 12v or more.
the lamps are grounded by the HL combo switch on THIS car
the ground must be good to this switch 0v, HL onl.
or the ground is bad. a white/black wire called G200
if 12vdc is weak (low) to HL then the relay or wire to it are bad.
if the ground is not 0v, (no more than 0.5vdc) then the ground is bad. if the ground is good, then the HL switch is bad and if bad gets hot and smell... (melting plastic in side)
there is the full answer, sans DRL> (a longer story that)

Feb 24, 2014 | 1991 Geo Prizm

3 Answers

One low beam head lights will not work, high beam works though


check for a damaged wire for the low beam. Also wouldn't hurt to check the ground wire as the high beam will try and ground through the low beam but not visa verse

Dec 29, 2013 | 1997 Chevrolet Blazer

1 Answer

Low beams go off when high beams are on


what car, what year,? what model (wrangler?) im clueless
bulbs get weak with age
the glass in bulb (looks like silver paint)
this is normal for extreme usage.
replace the bulbs if dim. both.
if the car has covers in front of bulbs (not my 02 wrangler)
but newer cars have this crappy plastic in front,
it can be cloudy, there is a nice kit that fixes it (labor) at walfart. ask.

dim lites?
1 dim bulbs
2 cloudy lenses.
3: bad wire, bad grounds and bad connectors to lamps.
4: wiring hacked by kids wanting HID bs.
5: wrong bulbs, kids again.
6: corroded fuses, (12v at lamp do you have)?
7: bad combo switch or its ground is bad.

if you have 12volts across the dim lamp, you can skip 3 to 7 fails.

see your FSM for how they work. and wiring.
does your car have DRL? daylight running light option or in CANADA?
that be more heart ache.
and my jeep the highs and lows are never on at the same time.
the combo switch selects one or the other.
what it does in flash mode, not sure. need car year. and name.


Dec 16, 2013 | Jeep Cars & Trucks

1 Answer

My friends 2009 Rav4 low beams are so dim, I didn't think that she had her lights on, but she did. What could be the problem?


You could have bulbs that are starting to go bad or a bad ground. The bad ground is the most likely cause since it happened to both at the same time, but it should effect the high beams also. So the first thing to check would be check the grounds at both headlamps and check the voltage supply at both headlamps. It is possible that you have low voltage and that would have to be checked at the switch and the dimmer if that is the case.

Mar 18, 2010 | 2009 Toyota RAV4

1 Answer

Left headlight is dim - like it has a bad ground. Right is fine. DRL are same as regular lights. High and Low beam on left same dim condition. Fuses are OK switch checks OK. Replaced the relay with no...


i think you hit the nail on the head with the ground problem,if you remove the bulb from the head light assembly,wiggle the black wire to see if the bulb gets brighter,if it does remove the bulb and clean and tighten the ground wire end.if it does not get brighter from a wiggle,connect the ground end of a test light to the positive post of the battery and probe the black wire,test light should light,if so replace the light socket.

Nov 26, 2009 | 2000 Chevrolet Blazer

1 Answer

Alero: low beams as bright as Daytime runners while brights work?


Look for the relay for the head lights,it may be bad.Also look for a bad ground.And check the bulbs too.

Nov 04, 2009 | 2003 Oldsmobile Alero

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