Intermittant Radio & Power windows?? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 09-09-2019, 12:15 PM Thread Starter
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Intermittant Radio & Power windows??

From time to time, my '02 F350 will not operate the power windows or radio. Sometimes it does, sometimes it doesn't. A bump in the road can send it either on or off. I know it's electrical and I have FORD '02 shop manual. I just can't seem to find where those two are connected. When one works the other does also. They also don't work at the same time. Somewhere there's a connection. Either power or ground.
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post #2 of 7 Old 09-09-2019, 03:52 PM Thread Starter
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I figured it out. The Battery safer relay (K115) must be taking a dump. There's power to the accessory delay relay (K126) but no power to the pickup coil of the K126. The Battery safer relay (K115) is a non serviceable relay in the Instrument cluster microprocessor that feeds the pickup coil of the K126. I can jump the 30/87 terminals and make things work but I'll have to wait til tomorrow to see if the Inst cluster m.p. is even available.

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post #3 of 7 Old 09-09-2019, 04:47 PM
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post #4 of 7 Old 09-09-2019, 04:52 PM
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Quote:
Originally Posted by Bart_3500 View Post
I figured it out. The Battery safer relay (K115) must be taking a dump. There's power to the accessory delay relay (K126) but no power to the pickup coil of the K126. The Battery safer relay (K115) is a non serviceable relay in the Instrument cluster microprocessor that feeds the pickup coil of the K126. I can jump the 30/87 terminals and make things work but I'll have to wait til tomorrow to see if the Inst cluster m.p. is even available.
You seem super knowledgeable in electronics. If you can repair the instrument cluster go for it!!! Most of us send if off to someone like Ed at FICMrepair.com. However you may be able to save yourself a few bucks.

To clarify, yes its definitely a problem in the cluster, very common on those trucks.
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post #5 of 7 Old 09-09-2019, 06:19 PM Thread Starter
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Yep, I'm pretty good with a soldering iron. As a matter of fact I have an old one that takes about 20 minutes to get hot and takes both hands to heft it That thing is for massive soldering jobs not this. I'll attack it someday soon. Right now I'm doing the electrical in a large garage I had built, moving in from another state LOTS to do before I tear the instrument cluster out. I'm assuming that the cluster microprocessor is in behind the dash. Feel to correct me if I'm wrong. I did put a 12 gauge jumper wire between the 30 and 87 terminal and everything works fine now. I have to manually shut off the radio and the clock stays on but that's not a problem.
7.3fl550 Thanks for the compliment. Does your signature mean you have an F550? If so I'm jealous. My F350 is great though. Even the wife loves it. "IF" the 7.3 ever goes south I'll have it rebuilt with BIG Havocs'. I purchased a 39' triple axle toy haulin' 5th wheel back when I had a Dodge 3500 and a 12 valve cummins. ONE trip with that Dodge and the 5th wheel and I started looking for a bigger engine. I've been a Ford man since my first 57 Thunderbird. BTW did I mention that the 5th wheel has a '66 Bronco rock crawler in the back? No wonder the Dog couldn't handle it. 7.3 doesn't much care what's in or behind it.
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post #6 of 7 Old 09-09-2019, 08:10 PM
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Send it to Circuit board medics and they will have you go to go in a few days. Why screw with it send it to the guys that fix this stuff in their sleep.
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post #7 of 7 Old 09-10-2019, 03:48 AM
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I've had the same problem with my 02 for a few years. About a year or so ago it also started affecting my door ajar light and dome light. Not sure what will be next. Don't have the loose change now but when I do I'll send it to circuit board medics.
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