Help,need headlight trouble shooting

[MustangMarauder]

Sooooo everything but my headlights were working.checked the bulbs,fuses and they were fine.I guessed it was the LCM.I got one from FASTBLACKMERC put it in yesterday and still no headlights.any suggestions? thank you in advance

[MarauderMax]

Start with, is there ground and DC voltage at the headlight plugs?

[fastblackmerc]

Got your PM's. Sorry I haven't responded to them.

Are the headlights OK? I have seen cases where both headlights burn out at the same time.

[shou]

If the bulbs are not burned out, do the high beams work?

[MustangMarauder]

Yes,high beams work.

[shou]

Is it permissible to attach wiring diagrams here?

[MustangMarauder]

Sure wiring diagrams would help.thanks

[shou]

I think it should be OK as I downloaded them from my local library's website.

I assume the headlamps do not work in either auto or manual mode correct?

[ctrlraven]

If high beams work and all other lights work besides Low Beam then you should replace the bulbs.

TWICE I had Silverstar headlight bulbs low beam burn out on me at the same exact time!

[MustangMarauder]

I pulled the drivers side head light out and by pulled I mean the entire headlight assembly.i can't believe they designed it that way,anyway the bulb was fine.they are the original bulbs.i ordered a new light switch because I don't know what else it could be.hopefully that does the trick

[ctrlraven]

I pulled the drivers side head light out and by pulled I mean the entire headlight assembly.i can't believe they designed it that way,anyway the bulb was fine.they are the original bulbs.i ordered a new light switch because I don't know what else it could be.hopefully that does the trick
Did you put in another 9007 bulb and see if low beam worked?

[shou]

Do you have a volt/ohm meter?

[MustangMarauder]

I will buy A set of 9007's,yes I do have A volt meter.

[MustangMarauder]

If I unplug the headlight harness from the headlight,what 2 prongs in the plug do I check to see if
I am getting power at the headlights?

[shou]

Looks like Dark Blue with a white stripe wire and the black wire.

[MustangMarauder]

SHOU,you sir are a genius!!!!! We'll I'm getting 12 volts at the headlight on each side with the light switch in the on position.i guess it's the bulbs.could the filaments the bad and still attached,not broke at any point?? i put them up to the light and they looked good??? If so I sure waisted a few dollars rebuilt LCM,new headlight switch and time and energy.

[shou]

Visual inspection isn't enough.
Go buy a pair of new bulbs and giver a shot!

[MustangMarauder]

Will do,I'll get back to ya on the out come.thanks again for all your help.

[shou]

As others have said here it is not unusual for the headlamps to burn out in pairs. It is very likely that once one burns out, the other is right behind it as it has burned the same amount of time.

[ctrlraven]

SHOU,you sir are a genius!!!!! We'll I'm getting 12 volts at the headlight on each side with the light switch in the on position.i guess it's the bulbs.could the filaments the bad and still attached,not broke at any point?? i put them up to the light and they looked good??? If so I sure waisted a few dollars rebuilt LCM,new headlight switch and time and energy.
You didn't waste money on the new rebuilt LCM, they factory ones are prone to fail at some point, mine did earlier this year. New headlight switch might of been a waste but just keep the old one in cause you may ever need it in the future.

I was pretty sure it was your bulbs if you still had high beam. If the LCM had failed then you would of had no LB or HB.

I'm sure you'll be happy to see again!

[MustangMarauder]

We'll I put a set of silver star's in and still have no headlights.the power I am getting to the headlight harness is for the brights.i just cane back from my mechanic and he said I am not getting power from the LMC to the headlight switch or the blinker arm.any suggestions ?.?.

[MustangMarauder]

I've also noticed a clicking sound from somewhere under the dash,nothing seems to be going on and off.

[MustangMarauder]

Ived owned my MM since new,it now has 55,000 miles and has never given me a problem.a few weeks ago I realized my headlights weren't working.since then I have checked the fuzes,changed headlight bulbs,changed headlight switch,got a rebuilt LCM from fastblackmerc also had the blinker arm checked and still no headlights.all other lights are working including brights when I pull the still back.i brought it to my mechanic and he said I am not getting power from the LMC to the headlight switch and to the blinker arm????? Any suggestions would be highly appreciated.....I'm almost ready to walk away from one of my pride and joys.. I forgot to mention I now occasionally hear a clicking noise coming from somewhere under the dash,like when the auto sensor kicks on the lights but no lights go on.

[Comin' in Hot]

I would pull the plug at the headlights and see if your power, it's possible both you have bulbs burned out.

[MustangMarauder]

I just put brand new silver stars in and the old,original ones weren't blown either.I have no power at the headlight,just the brights work when I pull back on the blinker arm

[MustangMarauder]

So I guess I'm on my own..

[EMAS]

If I unplug the headlight harness from the headlight,what 2 prongs in the plug do I check to see if
I am getting power at the headlights?

A volt meter will be useless in tracking down the problem if you take the load out of the circuit. The modern volt meter has a 10 megaohm input impeadance which means that even a crappy connection that will not light the headlight at all will still show full battery voltage.

If you want to use a volt meter the bulb needs to be plugged in and you need to probe the wires from the back of the connector. Connect the volt meter's ground probe to the battery neg terminal and probe all of the wires (on high and low beam) and record the voltages.

Note if the problem occurs only on low beam but high is fine then the problem is in the supply to the head light. If both are dim then the problem is in the ground.

[MustangMarauder]

I already know I'm not getting power to the headlights.I'm not getting any power from the LCM to the muliswitch or headlight switch.

[MustangMarauder]

Does anyone know if jim=fastblackmerc is out of town.I've tried PMing him a few times but no response.id like to try another LCM.

[fastblackmerc]

Does anyone know if jim=fastblackmerc is out of town.I've tried PMing him a few times but no response.id like to try another LCM.

Just got back...

Will respond to your PM tonight.

[MustangMarauder]

Just an update and I'd like to thank everyone who responded to this thread.my headlights finally work,turned out to be the LMC.jim aka fastlackmerc sent me another one and that did the trick.thaks again

[fastblackmerc]

Just an update and I'd like to thank everyone who responded to this thread.my headlights finally work,turned out to be the LMC.jim aka fastlackmerc sent me another one and that did the trick.thaks again

Glad I was able to help out.

[Jeronimojc]

Guys,
I started having headlights trouble too. I am pretty sure it has to do with the LMC. I've spent a few hours reading various posts here and in the crownvic.net site. It seems to me a good solution is to wire things to draw power directly from the battery, run it through a relay, and then to the headlights. Summit has a kit http://www.summitracing.com/parts/prf-30815/overview/ that seems to do just that. This delivers better power to the headlights and reduce load on the LMC.

If the above makes sense, does anyone know of better or more affordable kits to make the conversion? I'd rather have something as close as possible to a plug and play kit as I am not very electrically inclined. Buying relays, wiring, harnesses, separately is not for me. Thanks in advance.

Here is a link to more info someone else shared on this: http://madelectrical.com/electricaltech/brighter-headlights.shtml