Quote:
Originally Posted by Confetti
Ok, since you offered.....
This problem has us and many others stumped. Our 2000 Ford F-150 is having electrical issues. When it's running, the windows, stereo, and wipers will not work. BUT, they work when you turn the key back to acc. We put in a new ignition switch, checked all things that could be checked, and still can't figure it out. Finally, hubby hard-wired the wipers onto a toggle switch so we can run it in the rain, and he wired up the stereo directly so it works, but the windows are still out. He got a copy of the wiring schematic and has a bunch of electrician friends on the case, but nothing yet. If you have any ideas, it would be much appreciated!
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To summarize, if the key is on ACC/I, the accessories work. If the key is on ON/II, the accessorie do not work.
With all 3 accessories working and not working at the same time, I suspect that there's nothing wrong with the accessories themselves. The problem is somewhere in the ignition switch circuitry.
I wouldn't start haphazardly replacing parts. You need to test and diagnose first so you don't waste your money.
I'll say this though. Electrical gremlins are very hard to diagnose, and may cause a lot of money. The more you can learn to do on your own the better.
I would start with the old ignition switch if you have it lying around. Look in the factory service manual. It will show wire colours. Generally you want to check for continuity or lack thereof between the pins listed in the manual. If it doesn't match up exactly, you know what the problem is.
Gnerally speaking, at OFF/0, no power is supplied except to the power and computer to maintain the battery, and some other accessories like lights and horn. At ACC/I, power is delivered to the accessories like wipers, windows, radio on, etc.
At ON/II, power is delivered to engine stuff like fuel pump, computer, ignition, etc.
At START, power is temporarily cut to all accessories to preserve battery cranking power. When you release back to ON/II, it operates as above.
I would first suspect the ignition switch to have a bad connector. If you replaced it with a used one, chances are they all have the same problem. If you have a new one I would test it any way.
I would then suspect the relay circuit, but this would be rare since everything works fine in ACC. I believe that the Ford uses the same wires to send power in ACC as it does in ON. If this is the case, I would highly suspect the ignition switch and its wiring.
Notwitstanding the above, if Ford uses different wires to power the accessories at ACC and ON, I would trace the ON circuitry and find the short or failed component along the line.
With all due respect, electricians don't necessarily understand vehicle electronics. You need someone good with diagnosing electrical gremlins in cars. The only problem is those people charge a lot of money.
Whatever you do, don't take it back to the dealer if you can help it. But if you've exhausted your options then that's the only way.
Check
Home | National Highway Traffic Safety Administration(NHTSA) | U.S. Department of Transportation for recalls and Technical Service Bulletins (TSB) for your year/make/model. See if there is something available for that year F150.
Good luck!