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Old 06-24-2014, 08:27 AM   #1
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Driving with four way flashers

On some F53 chassis the four way flashers are hooked to the circuit that controls the lockup torque. Driving with the four ways on could could cause the lockup clutch to fail.
Something I have read on a transmission repair site.
Some people when pulling on a long hill or driving in foggy conditions put there four ways on.
Just thought I would pass this on.
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Old 06-24-2014, 08:40 AM   #2
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How to know if a mh has that?


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Old 06-24-2014, 08:48 AM   #3
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How to know if a mh has that?


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You would have to get into the schematics. For myself I would not use them when traveling,that is the best insurance. I think it has to do with the fact that if the brakes are being used it would shift the lock up torque
as required by the ECM. This I am only speculating on.
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Old 06-24-2014, 09:05 AM   #4
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What year are you speaking of?
The F53 with the E4OD TC clutch (1989-1997) is operated by grounding a wire by the PCM Computer. The other side of the solenoid is a common power supply to a lot of devices. The Computer has no way of knowing the four way flashers are on.

I think this would also apply to a few years after that with 4R100.
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Old 06-24-2014, 10:34 AM   #5
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When I have the 4 ways ON, I'm already with the lock up torque convertor OFF. Climbing or descending. Sounds like a job for "MYTH BUSTERS". DWAI Don't Worry About It.
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Old 06-24-2014, 11:34 AM   #6
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Originally Posted by narampa View Post
On some F53 chassis the four way flashers are hooked to the circuit that controls the lockup torque. Driving with the four ways on could could cause the lockup clutch to fail.
Something I have read on a transmission repair site.
Some people when pulling on a long hill or driving in foggy conditions put there four ways on.
Just thought I would pass this on.
Could you supply a link to where you found this information.
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Old 06-24-2014, 11:36 AM   #7
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Before getting real excited about this possibly damaging poor engineering, I'd like to see links to the source of this information. There's a lot of Ford chassis RVs out there and I've never heard of the emergency flashers causing this issue. Many RVers use flashers when dropped below 40 mph on grades, as per many state laws.

Please show us the link!

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Old 06-24-2014, 06:32 PM   #8
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Hey
Don't shoot the messenger! I don't have a link as I was looking for info on a transmission I am rebuilding. Came across it and did not think much about it except for the fact that I thought I would pass it on. I don't really care if you never heard of it or not. As for the year all it said was some F53 transmissions.
Next time I drive mine I will see if it works on my 98 chassis. Should not be hard to figger out if it does or not.
Now let me get back to this tranny rebuild. If somebody knows anything about this please PM me as I am curious about it also. In the mean time I will try and find where I got it when I get time to go back through my history on my shop computer.
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Old 06-24-2014, 06:48 PM   #9
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Not trying to shoot anyone, I just dislike internet myths, legends, and falsehoods spread in the name of 'informing' someone. The only reference to anything like this is that the O/D light will blink when transmission needs servicing.
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Old 06-24-2014, 07:01 PM   #10
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This is a hard pill to swallow. But I've been in the trucking business for over forty years, and I never run the four ways unless its a emergency. But I do run the tail lights most of the time, and DRLs all the time. If they can't see that, they are going to run over you anyway. I don't think the flashers are related to the transmission in any fashion.
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Old 06-24-2014, 08:20 PM   #11
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Originally Posted by subford View Post
What year are you speaking of?
The F53 with the E4OD TC clutch (1989-1997) is operated by grounding a wire by the PCM Computer. The other side of the solenoid is a common power supply to a lot of devices. The Computer has no way of knowing the four way flashers are on.

I think this would also apply to a few years after that with 4R100.
You are correct on both transmissions. They both have a constant power feed (via the PCM relay)to the solenoids and the ground is the control.
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Old 06-24-2014, 08:24 PM   #12
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Originally Posted by narampa View Post
On some F53 chassis the four way flashers are hooked to the circuit that controls the lockup torque. Driving with the four ways on could could cause the lockup clutch to fail.
Something I have read on a transmission repair site.
Some people when pulling on a long hill or driving in foggy conditions put there four ways on.
Just thought I would pass this on.
Not sure where that was mentioned however it is not feasible. The reason why is the 4 ways are always powered up even with the key off. The solenoids in the transmission cannot have power applied to them when the key is off. All power is cut off to the solenoids when the key is off. Plus the power on a E4OD/4R100 is via the PCM power relay and the 5R110W receives power via the PCM.
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Old 06-24-2014, 09:33 PM   #13
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Quote:
Originally Posted by narampa View Post
On some F53 chassis the four way flashers are hooked to the circuit that controls the lockup torque. Driving with the four ways on could could cause the lockup clutch to fail.
Something I have read on a transmission repair site.
Some people when pulling on a long hill or driving in foggy conditions put there four ways on.
Just thought I would pass this on.
I can absolutely tell you that on my MH...96 32foot Bounder 460/e4od on my last trip..........yeah..........the 4 ways definitely messed with my transmission. I had a story/response that took me 25 min. to type out, but, i accidentally hit the back button on the computer and lost it all, but I'll redo it and tell you what happened.
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Old 06-24-2014, 09:40 PM   #14
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Ok here is the link, and Bob I am not starting a rumor,I was just relaying this as I thought there were people that would appreciate the fact that maybe it's true. You seem to answer a lot of posts so I would assume that you are a mechanic. I have been a mechanic for 40 years. We still have our fleet and shop but I am kinda semi retired but when I read something interesting I try to pass it on.
Here is the Link Notice for all Ford trucks with the E40D transmission [Archive] - PlowSite.com™ - Snow Plowing & Ice Management Forum
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