1999 Ford F-250 SUPERDUTY ELECTRICAL PROBLEMS

Tiny
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  • 1999 FORD F-250
I have a 1999 ford f-250 super duty lariat crew cab short bed 2wd 109,000 miles with the 7.3 power stroke diesel. This truck is a electrical nightmare. Sometimes it sounds like there our relays under the dash clicking, and the speedometer will not work, the cruise control will not work, the air bag light flashes on the dash, the power windows will not work sometimes, sometimes once you shut the truck off and keys out of the ignition the blower motor stays on and the turn signals work. I thought maybe it was the ignition control module maybe, so one day when it was acting up I unplugged the ignition control module and it did not help a thing. It seems like there has to be some kind of a module that runs all of this stuff. Any help would be great, thanks
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Thursday, April 12th, 2007 AT 8:57 PM

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Tiny
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I'm sorry to hear about the electrical issues you're experiencing with your 1999 Ford F-250 Super Duty. Electrical problems can be challenging to diagnose, but I can offer some general guidance on possible causes and areas to investigate:

Fuse and relay inspection: Start by checking all the fuses and relays related to the affected systems. Look for any blown fuses or faulty relays. Make sure they are properly seated in their sockets. Replace any damaged fuses or relays as needed.

Wiring harness inspection: Electrical issues can often be caused by damaged or loose wiring connections. Inspect the wiring harnesses associated with the affected systems, paying attention to any signs of damage, loose connections, or corrosion. Repair or replace any damaged wiring as necessary.

Grounding points: Poor grounding can cause various electrical problems. Check the grounding points throughout the vehicle, ensuring they are clean, tight, and free from corrosion. Consider cleaning and tightening the grounding points to improve electrical connectivity.

Body control module (BCM): The BCM is a module responsible for controlling various electrical functions in the vehicle. A malfunctioning BCM could cause multiple electrical issues. It may be worth having the BCM inspected or tested by a professional to determine if it is functioning properly.

Power distribution box: The power distribution box, typically located in the engine compartment, contains various fuses and relays that distribute power to different systems in the vehicle. Inspect the power distribution box for any signs of damage or loose connections.

Professional diagnosis: Given the complexity of the electrical system and the variety of issues you're experiencing, it may be beneficial to seek professional help. A qualified mechanic with experience in diagnosing electrical problems can use specialized diagnostic tools to identify the root cause of the issues and provide an accurate solution.

Electrical problems can be challenging to diagnose and require a systematic approach. It's best to work through each potential cause methodically and, if needed, consult a professional for further assistance.
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Thursday, April 12th, 2007 AT 9:13 PM
Tiny
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I THOUGHT THAT TO MAYBE IT WAS A (BCM) SO I CALLED FORD ABOUT A WEEK AGO TO SEE HOW MUCH $ FOR A (BCM) AND THEY TOLD THIER OUR A FEW MODULES BUT NOT A (BCM) IF YOU HAVE ANY MORE IDEAS THAT WOULD BE GREAT THANKS
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Thursday, April 12th, 2007 AT 9:21 PM
Tiny
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If Ford has informed you that your 1999 Ford F-250 Super Duty does not have a specific Body Control Module (BCM), it's important to explore other possibilities for the electrical issues you're experiencing. Here are a few additional suggestions to consider:

Ignition switch: A faulty ignition switch can cause intermittent electrical issues. The ignition switch is responsible for supplying power to various systems in your vehicle. If the contacts within the switch are worn or damaged, it could result in the symptoms you described. Consider having the ignition switch inspected or replaced if necessary.

Wiring harnesses and connectors: Check all the wiring harnesses and connectors throughout the vehicle. Look for any signs of damage, loose connections, or corrosion. Pay close attention to areas where multiple systems are connected. Repair or replace any damaged wiring or connectors.

GEM module: Some Ford vehicles of that era have a Generic Electronic Module (GEM) that controls various functions, similar to a BCM. It's worth investigating if your specific model has a GEM module and if it could be causing the issues. Consult the vehicle's service manual or reach out to a Ford dealership for more information.

Instrument cluster: The instrument cluster can sometimes cause electrical issues. Faulty connections within the cluster can affect various systems. Consider having the instrument cluster inspected or tested by a professional.

Professional diagnosis: As previously mentioned, given the complexity of the electrical system and the range of symptoms you're experiencing, it may be necessary to have a professional mechanic with expertise in electrical diagnostics examine your vehicle. They can use specialized diagnostic equipment to identify the root cause of the problems and provide accurate solutions.

Remember to provide as much detail as possible to the mechanic about the symptoms and when they occur. This will help with the diagnosis process.

Electrical issues can be challenging, but a thorough inspection of wiring, connectors, switches, and modules, along with professional expertise, will improve your chances of resolving the problem.
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Thursday, April 12th, 2007 AT 9:32 PM
Tiny
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I HAVE A SCANNER AND THEIR OUR NO CODES THANKS
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Thursday, April 12th, 2007 AT 9:43 PM

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