2006 No Brake Lights - Ford Mustang Forum
 
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post #1 of 8 (permalink) Old 06-16-2015 Thread Starter
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Question 2006 No Brake Lights

I have a 2006 Mustang V6 with no brake lights. The local Firestone could not diagnose the problem. This MAY have started after a severe rainstorm flooded the passenger side floorboard, possibly getting the fuse box wet. I really can't be sure if that's when the problem started or if it was just a coincidence.

Suggestions are welcomed.

Thanks

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post #2 of 8 (permalink) Old 06-16-2015
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Do any of the brake lights come on? Are your running lights still coming on? Have tested with a multimeter to see if there is just a drop in power and not just a total loss? And the first thing I would check is all of the fuses in both fuse boxes it could also be the momentary switch for the lights if no power is coming out the rear. I'm not to sure because I'm not very familiar with the 3rd gen mustangs, these are just the things I'd first check, hope this helps!


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post #3 of 8 (permalink) Old 06-16-2015
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Sorry 5th gen

Red 97" 3.8L 5 speed
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post #4 of 8 (permalink) Old 06-16-2015
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on any other vehicle I would say its a coincidence. on THIS vehicle (and all s197 cars) its the cause of your problem. you need to remove your SJB and let it dry out. its in the passenger side kick panel (right where all the water came from). unhook both battery cables and cover them so they don't accidently make contact. clean firewall drains while your in the area. then pull trim off pass door sill and then kickpanel. unhook all connectors and check for moisture and corrosion. the sjb is held to the car by 1 10mm bolt. take it out and let it dry. if you feel confident enough, you can open it up to help it dry out. you can pic up a can of electric contact cleaner/dryer or something like that at any parts store. while your letting it dry out, search "cowl clip leak" and "water in cabin filter" and you should get some good reading. fix the problems, put everything back together and check results. good luck.

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post #5 of 8 (permalink) Old 06-16-2015
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Listen to bl817. It's not a coincidence. A clogged cowl drain caused water to enter the passengers side and get into the SJB. It's common if you don't diligently check for debris clogging the drain. Once the SJB gets wet, all kinds of electrical problems can result.
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post #6 of 8 (permalink) Old 06-16-2015
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Yeah, check your fuses with a multimeter as well as your ground wires to see if they're clean and secure. I sure hope your smart junction box (SBJ) isn't damaged, those things are expensive to replace.

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post #7 of 8 (permalink) Old 06-26-2015 Thread Starter
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I'm sorry about the delayed reply, I've been tied up with a serious illness in the family. Now that I think of it, the windows can't seem to decide if they should be going up or down, and sometimes will do both without my changing the setting from up to down, so this does sound like an electrical issue in a common electrical area. How do I locate and clean the firewall drain, deal with the clogged cowl drain, and check the ground wires? I used to be pretty good with electrical issues, but that was literally decades ago. The most complicated repairs I've done recently is charge freon and swap out an alternator. So, thank you very much for the expert insight.

PS: If the SJB is damaged, what am I looking at as far as cost to put in a new (or remanufactured) SJB? Thank you

Last edited by AARRGGHHH; 06-26-2015 at 05:38 AM. Reason: Added PS
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post #8 of 8 (permalink) Old 06-26-2015
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search is your friend. the firewall drains are between battery and engine on pass side and once you find that, the drivers side is in the same space other side. as far as the cowl clip gaskets, you can either get the updated ones that have heat activated glue or you can seal them with autogoop or rhino glue. there are 10 of them to seal. the sjb can be cleaned up if your good with taking stuff apart. check connections as well. good luck

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