My day time running lights are work as do my high beams, however my low beams do not, but i thought they were all the same bulb? Also, now by fog lights won't come on -only work when low beams work

I have seen both low beam bulbs burn out at the same time.
Its possible the relays have burnt out for the low beams.

one wire will for high beam
one wire will be for low beam
the last wire will be ground wire
as fog light have only one beam you can use the low beam wire and parallel wire it to the fog lights
that way you have the head lights still and the fog lights as accessories correctly wired according to regulations
how to do it simply-- find the low beam power wire ( light switch on low beam and power at the light bulb check ed with a multi meter set on volts
solder , piggy back, or double plug in a connection into that wire and run one wire to the left fog light and one to the right fog light connect each fog light to an individual ground wire and connect those wires back to the ground wire for the main lights
Now having done that simple addition to the lighting system another problem has come up
The wiring will now be too light to carry fog light current and or the light switch will burn out
To over come this problem, the circuit needs a relay
fit a relay on the bike and now run the low beam wire to a terminal of the relay
run the other terminal wire to ground
this enables the relay to operate when the low beam is switched on but at this will not switch on the lights yet
now you have to run a heavy gauge wire (fused at the battery) to one of the power terminals of the relay and from the other power terminal to the connection for the fog and low beam lights
Now it all works switch on the high beam and no for lights
change to low beam and the fog lights come on as well
All nice and legal
Of course if you don't care about being legal just buy a 30 amp toggle switch and run a fused wire directly to the switch from the battery to the lights and then to ground from the lights
You will know that the generator / alternator for the bike will not be able to run the fog lights with or without the main lights so what will you have achieved

You can not have High Beams on and FOG LIGHTS at the same time. The Body Control Module controls this. You may have a bad Body control Module

Many of the newer vehicles have bulbs that are removed internally, meaning with the hood up. You cannot touch the replacement bulbs with you fingers as the oils from you fingers will shorten its life. Wear gloves or use tissue. The low beam went because they were hot when you struck the other vehicle, when hot they become more delicate.

First it is possible that both low beam filaments in bulb are burnt. Check fuses for low beam before replacing the bulbs.

It sounds like you are confused about how your headlamp system is supposed to work. The DRL does not run on the High beam circuit, it runs on the low beam circuit. The fog lamps are supposed operate with the park lamps and also with the low beams, not the high beams. From your description, I would say that your system is operating as designed and you are having trouble telling High from Low. (Don't feel bad, that is why high beam indicators were invented in the first place.)

with or without DRL (day time running lamps)

if without...
since both headlamps have their own fuse I would start by testing the headlamp (low) relay

if however, the high beams do not work either, then you may have a more serious wiring concern


let me know if you need any further assistance

check the fuses first, no luck replace the day time running light module.

most likely the hi lo switch

Your blazer has a total of six bulbs (eight if you have fog lights) . Two are low beam, two are high beam and two are daytime running lights. It sounds to me like your high/low beam selector switch is faulty. This switch, as you might know also controlls many other functions, so if you are not having problems with other things like cruise, wipers or blinkers, I'd make sure first that your fuses are all good and the bulbs are good also before tearing into anything.