Headlights wont come on2000 chevy blazer, fuses inside and underhood have power,even power to headlight bulb, was told I have a ground problem

PAWEL IS A BOT. HE POSTS GENERIC ANSWERS. AND OVERLAYS NAME OF YOUR CAR. 82 GENRIC ANSWERS HIM
AND LIES ABOUT IGN SWITCH.
NOW YOUR CAR.! FACTS, ONLY, 1 CAR
LEARN TO USE THE DMM , CORRECTLY;
HEAD LAMPS ON.(SWITCH) NO KEY IS NEEDED FOR HL.
IS DRIVER LEFT OR RIGHT,? IN USA LEFT.
IS HIGH AND LOW BEAMS DEAD LEFT? No TOLD AT ALL.
PUT METER BLACK LEAD TO THE BATTERY NEG LUG
THEN PROBE RED TO ALL WIRES OF DEAD LAMP 1 BY 1.
12VDC IS GOOD 0 BAD
IF LAMP GROUND PIN READS 12VDC <<< GROUND FAILS.

LEFT LAMP USES GROUND LUG G101. IF R

CAR HAS DRL. SO DRL AND MANUAL LAMPS FAIL
HIGH , LOW , AND FLASH HIGH>? NOT TOLD
DOES ENGINE RUN? OMG NOT TOLD.
THIS CAR RUN HL RELAYS BY BCM CONTROLLER BRAIN


FUSE ARE ON THE OUTPUT OF ALL HL RELAYS
SO IF ALL FUSES INPUT(TOP) ARE DEAD,THAT MEANS
BCM IS FAILING. OR THE SWITCH TO IT.
OR FUSES BLOW TO BCM
WE SCAN THE PCM/BCM TO SE WHY.


HEAD LAMPS ON THE 4 FUSES ALL 4 RIGHT SIDE ARE
12VDC, IF NOT BCM IS MESSED UP, OR RELAY DEAD.
HE LOW BEAM RELAY RUNS BOTH SIDE
SAME WITH BEAM. A RELAY FOR IT.
DRL HOT ONLY IN DRL MODE.
DRL; HAS A SUN SENSOR (AUTO MODE)


BOTTOM HERE IS HEAD LAMPS.SIDE.

HEAD LAMPS ON USA WORK EVEN KEYOFF
SO DOES BCM TO DO THAT, MAIN BATTERY NOT DEAD

There are right and left fuses for the headlights. The dimmer switch and headlight switch provide the ground circuit.
Do you have power at the fuse ?

You have to go back to the route cause & time
frame of the problem

Did you check voltage & ground at each lamp connector,
when they first got dim & you started to resolve things?

Why converter to a different bulb?
I don't know the current draw of the oe vs: the H4,but
that has to be considered

Obviously the alternator output would be up there at the
same time your checking lamp connector voltage.

Problem--Voltage Drop somewhere or too much resistance
somewhere,basic OHM's Law

You may have a loose or corroded headlight ground to the body, the ground wires are in most GM attached to the body near the headlight under the hood. Check all the grounds you can see on the inside of the fender, tighten and clean the with a wire brush, also check the headlight connector for problems like corrosion or not fully seated to the headlight bulb.

Could be a bad ground oh headlights or power not getting to the bulb hot side.
If you have a volt meter you can measure the voltage there on the headlamp.
First measure the hot side...if 12 volts there then measure the bulb ground side. If 12 v is there then the ground connection is bad.

Hope this helps you

if the fuses are good then you need to check for power and ground at the headlight plug that attaches to the headlight bulb if you have a good power and ground there and the connections are good then the bulbs are both no good.or if you can tell the bulbs are burnt out by looking at them then you don`t have to check powers and grounds.you also can directly feed power and ground to the bulb and check both the terminals for high beam and low beam as you cannot tell which is which by looking at the terminals

dear sir

first open headlight box and remove the bulb and check by tester power supply (DC power supply ) Is coming there or not if its coming and bulb wont work then its problem in bulb if supply is not coming till headlight then check fuse box and other connector i think there any fuse is broken that's why headlight is wont working . change fuse after that headlight will work again

hope answer the question
thank you
please vote!

A dim headlight after replacing would indicate a bad ground on that side. Check the black wire running from the headlight and try following it back to where it grounds. Or you can run a ground wire direct to the headlight and make sure you ground it to bare metal, or the negative post on the battery.

Yes, you can. Just take off the front grill, and the
headlights assembly. Don't tinker with the head-
light assembly adjusting nut, as this would change your headlight level. Take headlight bulb
off and change it. Replace the headlight, then, the
grill, and it's done.

Check high beam switch on steering column.