Left rear turn singanl intermittent blinking

[superdave55]

I have a 99 Explorer XLT and the left rear tail light isn't working correctly. When I use the left turn signal the light on the dash board blinks fast sometimes and normal sometimes. What gives?

 

[shucker1]

Check for a lose connection at the turn signal bulbs or bulb holders themselves.

Fast blinking is an indicator of a burnt bulb.

Since it comes and goes my guess is a bad connection.

 

[MAS Tequila]

If the bulbs are good and the contacts are good, check the MFS.

I chased the same issue on an F150, spent hundreds at shops trying to get it fixed, and it was the MFS.

MT

 

[superdave55]

what is the MFS?

 

[Flash]

MFS = multi function switch.

Further to what shucker1 said, the back of the tail light unit is exposed to all sorts of crap and I've even seen a bulb socket rusted out on a car that's never seen snow.

 

[1997XLTRollover]

My explorer and my taurus did the same thing. Take the mfs out, pull it apart carefully and clean the contacts with some sand paper. Did this to both of mine and it fixed the issues.

 

[swshawaii]

The multi function switch CONNECTOR is a known issue on certain Explorer's. The harness was installed from the factory without adequate slack. IF you have a tilting column, try moving it all the way UP. If that helps, you have a possible connector issue. GL

http://www.mysporttrac.com/MySportTrac/projects/Steering_Column_Wiring_Repair_Gen1.pdf

 

[superdave55]

Where can I find the info on how to replace my left rear tail light assembly? I've noticed that there are two cracks in the lens and there was water collecting inside. That's probably what is causing my problem.

 

[shadowless127]

Where can I find the info on how to replace my left rear tail light assembly? I've noticed that there are two cracks in the lens and there was water collecting inside. That's probably what is causing my problem.

No guide needed, it's just 4 bolts and some elbow grease. Literally you losen the bolts and gently pry the light assembly away from the body.

 

[Flash]

I've noticed that there are two cracks in the lens and there was water collecting inside. That's probably what is causing my problem.

Yup.

As shadowless127 said, it's pretty easy - just follow your nose.