2007 Won't stay running -- Possible electric problem - MustangForums.com



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Old 09-22-2015, 06:05 PM   #1
Seanam
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Default 2007 Won't stay running -- Possible electric problem

My 2007 Ford Mustang 4.0L will not stay running. The car turns off whenever the engine fan turns on, or you turn on the AC, the headlights, the parking lights, or the right turn signal. Left turn signal bogs the car down, but doesn't shut it off. Dashlights, heater fan, brake lights, interior lights, radio, etc., all work fine. The connector under the Engine Fan Relay in the BEC is burnt, but the relay seems OK and the fan turns. I'm not sure where to go from here. Has anyone experienced a similar problem?
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Old 09-24-2015, 05:34 PM   #2
bl817
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take a look at the smart junction box in the passenger side kick panel. check all the connectors. I'm willing to bet its getting wet when it rains or carwash, and over time its corroded big time. pull the sill plate off, then the kick panel. 10mm bolt holds it to the body. pull it off and inspect it. good luck
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Old 09-26-2015, 11:49 AM   #3
07 Stang
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Quote:
Originally Posted by Seanam View Post
My 2007 Ford Mustang 4.0L will not stay running. The car turns off whenever the engine fan turns on, or you turn on the AC, the headlights, the parking lights, or the right turn signal. Left turn signal bogs the car down, but doesn't shut it off. Dashlights, heater fan, brake lights, interior lights, radio, etc., all work fine. The connector under the Engine Fan Relay in the BEC is burnt, but the relay seems OK and the fan turns. I'm not sure where to go from here. Has anyone experienced a similar problem?
Seanam, it has been raining a lot here in VA lately so if you drive or park your car outside in it, the likely culprit is probably a wet Smart Box as bl817 suggested. Feel around the passenger carpet area to see if it is wet or damp. There are a number of threads on this unfortunate subject. Perhaps you may be able to fix it yourself. Let us know what you find.
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Old 09-30-2015, 04:41 PM   #4
Seanam
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Thanks so much for the replies! I checked the SJB, all the fuses, and began tracing the wiring out of the BEC. Turns out that the problem was the ground connection for the headlight wiring harness. Cleaned that up and tightened it down and everything is working again. I ran across a post from another member who was having similar problems that put me onto the solution.

https://mustangforums.com/forum/4-0l...ing-issue.html

Thanks again!!!
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Old 10-01-2015, 03:22 PM   #5
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Glad it's fixed.
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Old 10-04-2015, 11:15 AM   #6
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Good Job! Glad you were able to resolve it.
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