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Electrical problem with Smart junction box

Tiny
KAP1
  • MEMBER
  • 2005 FORD MUSTANG
  • 111,000 MILES
My smart junction box has been replaced in my car 4 times since 2010 the first thing to go out on the car has always been the blinker lights on the right side. The mechanics at the shop keep telling me that it is my speaker system which was installed in 2006 in my car. The same shop also installed an alternator in my car in 2010 after that the junction box has been going out over and over is it a possibility they installed something wrong on the alternator and it keeps blowing the box.I also noticed that the same shop also re-wired my speaker system ground wire behind the cd player and ran it thru the actual wiring harness on the car instead of it having its own ground wire could this be the problem also, the wire for the amp is grounded to the frame in the back but the ground for the cd player is ran thru the wire harness the shop told me that all the power from the speaker is going to the smart box and making it blow. Could this really be the problem even tho I didnt have any problems untill the alternator was replaced and the wires were re done behind my cd player for them to install a fog lamp switch on my car
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Tuesday, May 21st, 2013 AT 1:31 PM

12 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
This may be a combo problem and i'm only guessing cause i'd really have to look at it. But the cd shold have it 's own ground i'm guessing this is one of the high powered radio units with amp and those really should have their own power harness and not attached to the smart box. Also with the high amp draw the battery cables should be checked for cleanliness and not any corrosion as this causes problem s as well. Maybe the alternator that was installed is of higher amp to take up for what is installed. The speakers may hav eto be grounded to cd to make it work but there should also be another ground to body of car. But like I said not seeing this i'm trying to give an educated guess.
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Wednesday, May 22nd, 2013 AT 8:07 AM
Tiny
CALON BAILEY
  • MEMBER
  • 6 POSTS
Hi, I have the exact same problem. 2006 model here and replaced SJB once already but my right-side blinker flashes really fast and my battery drains within days. My draining comes from #59 fuse in the engine bay compartment. Please tell me if you know what the problem was as I've been trying for years to fix. Found several wires burned up going down the passenger side back to the taillights.
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Thursday, June 23rd, 2022 AT 10:56 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Unfortunately, I doubt they will respond to you as this was several years ago.

However, when you say fuse 59 is draining your battery, can you give a little more detail on that? How have you found that this is an issue?

The only reason I ask is because this fuse is one of the B+ supply for the SJB and it should be hot at all times.

So, if you are checking for voltage when the ignition is off then that would be expected.

I am attaching the wiring diagram below that will show this but basically if we are finding the SJB is shorted then that is likely the issue.

When was your SJB replaced? These are known to fail so I am not surprised if this has failed again.
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Thursday, June 23rd, 2022 AT 6:06 PM
Tiny
CALON BAILEY
  • MEMBER
  • 6 POSTS
It was replaced and had problems right away with it and found burned up wires after the SKb on passenger side. Tan/red, red/white and also dark green/light green somehow was snipped coming out of the connector. I really just need the rest of the diagram showing the wiring and what it goes to find out what the dark green/ light green go to. This box was very clean and not corroded. I think that the short in wiring is causing the drain at the box. But I’m no expert either so any help would be appreciated.
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Tuesday, June 28th, 2022 AT 3:06 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
If can get a little more detail, then I can get that circuit info. Unfortunately, the SJB diagrams are extremely large as they power just about everything in the vehicle, so we are going to have to narrow this down a little.

Can you tell me which connector the wires are in? What color is the connector?
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Tuesday, June 28th, 2022 AT 10:32 AM
Tiny
CALON BAILEY
  • MEMBER
  • 6 POSTS
It’s this where the connector is grey and so are both the slide out ports inside. For some reason that green wire and tan/red are cut and gone. I assume that’s why there are two yellow wires now running in their place.
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Tuesday, June 28th, 2022 AT 1:53 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay. That did not help as much as I thought it would. There are a couple grey connectors, but I thought I would be able to find the wires in there.

I attached the pinout chart of the connector it appears to be. However, I also attached the back of the SJB. Can you tell me which number this connector is?
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Tuesday, June 28th, 2022 AT 5:07 PM
Tiny
CALON BAILEY
  • MEMBER
  • 6 POSTS
Sorry for the late response. Holiday weekend has me busy. Its the C2280d connector. If you have the info on where those wires need to go to from there, that would be an amazing help! I just want to fix this so I can finally sell the car. Thanks!
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Sunday, July 3rd, 2022 AT 8:07 AM
Tiny
CALON BAILEY
  • MEMBER
  • 6 POSTS
Basically, I need to know where the wires go to the rear right taillight because where the problem started was the aftermarket taillights, I think. The wires that all burned up went to that R rear taillight connector.
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Sunday, July 3rd, 2022 AT 8:13 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
No problem, sorry for the delay. Here are the exterior lighting wiring diagrams so you can see how the system works. Check out the diagrams (below). Please let us know what happens.
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Tuesday, July 5th, 2022 AT 11:44 AM
Tiny
CALON BAILEY
  • MEMBER
  • 6 POSTS
Hey Ken, sorry it's been so long since I got back. Been so busy my car has just still for months. I ended up just pulling a full chassis harness from another mustang at a junk yard and made sure everything was correct triple time. Now finally all my lights work the right way and the whole car seems to be working perfectly as it should. One problem, now my car won't start at all. There is no noise or click or anything. I assume it's something to do with starter relay or ignition but I'm not sure what steps are easiest to do. Please help me! I'm so ready to get this going so I can sell it. Thanks!
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Monday, September 26th, 2022 AT 2:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Good job on the wiring fix. Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Tuesday, September 27th, 2022 AT 12:04 PM

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