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Mike S.
Mike S., ASE Certified Technician
Category: Mercury
Satisfied Customers: 6777
Experience:  ASE certified
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1995 Mercury. Left head light cuts out after 90 seconds.

Customer Question

1995 Mercury. Left head light cuts out after 90 seconds. Suspect light bulb, socket, or ballast. Dealer wants to replace computer for $1,900. Hopefully, you have something else.
Submitted: 10 months ago.
Category: Mercury
Expert:  Mike S. replied 10 months ago.

mercury what? have you tried any of those parts you mentioned yet, except of course for the computer?

Expert:  Mike S. replied 10 months ago.

You never said what model this is and you might as well tell me what the engine is, too.

Customer: replied 10 months ago.
Okay, here is all the information I have: 2005 Mercury Montago six cylinder. If you need it, I can retrieve the VIN.
Expert:  Mike S. replied 10 months ago.

Ok, while I look the wiring diagram and/or tsb's can you answer have you tried any of those parts you mentioned yet, except of course for the computer?

Expert:  Mike S. replied 10 months ago.

At first you said 1995, now you say 2005. yeah, you should give me the vin!

Customer: replied 10 months ago.
Replaced the light bulb but resulted in the same effect.
Customer: replied 10 months ago.
Sorry for the confusion-it is a 2005.
Expert:  Mike S. replied 10 months ago.

there is a tsb on "headlamps flickering intermittently, with no key in the ignition."

Does it do this at all?

Expert:  Mike S. replied 10 months ago.

It says to Reprogram the smart junction box (SJB). Here it is, just in case I find nothing else wrong,

Customer: replied 10 months ago.
I just tried it with the key in the ignition. The car is not here right at the moment.
Expert:  Mike S. replied 10 months ago.

A lot better than replacing the computer.

Expert:  Mike S. replied 10 months ago.

Tried what "with the key in the ignition"?

How can you say "I just tried it" and "The car is not here right at the moment"?

That doesn't make sense.

Expert:  Mike S. replied 10 months ago.

Are these High Intensity Discharge (HID) lamps?

Expert:  Mike S. replied 10 months ago.

I see there is a ballast on each headlight so I seriously doubt if both ballasts could be bad.

Expert:  Mike S. replied 10 months ago.

Are both headlights flickering and both high and low beams on both sides?

Expert:  Mike S. replied 10 months ago.

If it's just the high beams doing this try a new high beam relay in the smart junction box.

Customer: replied 10 months ago.
Okay, it is a relative's car and I tried it this afternoon. I am back at my house e-mailing you. I have printed out the download and will take it to a mechanic tomorrow. By the way, it is only the left headlight that is causing the problem. Is there a case number ***** can use when I attempt to contact you tomorrow?
Expert:  Mike S. replied 10 months ago.

Here is the wiring diagram for the High Intensity Discharge (HID) lamps,

Expert:  Mike S. replied 10 months ago.

Just contact me back in here. OK, it's just the left, is it both high and low beams?

Customer: replied 10 months ago.
Okay, thanks for the diagram. I will let you know the progress tomorrow.
Expert:  Mike S. replied 10 months ago.

Ok, don't forget to rate me well if it's fixed tomorrow. Why could you not answer that last question though? We have gone so far and now you quit?

Expert:  Mike S. replied 10 months ago.

it's just the left, is it both high and low beams?

Customer: replied 10 months ago.
I have just tried it with low beams. They are HID lamps. It is just the left head light. I am stopping because dinner is ready. You have to set your priorities!
Expert:  Mike S. replied 10 months ago.

You said you tried it with low beams but you never sais what was the result?

Customer: replied 10 months ago.
You turn on the low beams with the key in the ignition. After a few seconds, the let head light starts to flicker. About 90 seconds, the light goes out. Have a good night!
Expert:  Mike S. replied 10 months ago.

Yeah.

Customer: replied 10 months ago.
Update: I have turned the diagrams over to my relatives who will turn them over to their mechanics. I will give you a report in a couple of days and submit a critique to this web site. Thanks!
Expert:  Mike S. replied 10 months ago.

ya

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