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Old 03-16-2023, 08:56 AM   #1
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A long shot....

My 1997 Jayco Eagle on an E-350 chassis was at my mechanics to replace the cruise control servo module. Which, by the way, is almost unobtainable. I finally found a rebuilt one.

The new module was installed but then he found it was not getting the correct power. When checking the fuses, he found that his "guide" (I' will leave that to your interpretation.) did not match the fuses. One had a 15 where it should be a 25, and one did not have a fuse at all. So, he asked if I had a Jayco owner's manual. Again, unobtainable. Such is life with old rigs.

I'm scheduled to take it back in on Tuesday, as I need it this weekend.
I do have the Ford E-350 owner's manual, but he wonders if Jayco made changes.

Anybody got any suggestions as to where I may get the fuse layout for my rig?

Thanks.
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Old 03-16-2023, 09:04 AM   #2
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Quote:
Originally Posted by SmokeyBear View Post
My 1997 Jayco Eagle on an E-350 chassis was at my mechanics to replace the cruise control servo module. Which, by the way, is almost unobtainable. I finally found a rebuilt one.

The new module was installed but then he found it was not getting the correct power. When checking the fuses, he found that his "guide" (I' will leave that to your interpretation.) did not match the fuses. One had a 15 where it should be a 25, and one did not have a fuse at all. So, he asked if I had a Jayco owner's manual. Again, unobtainable. Such is life with old rigs.

I'm scheduled to take it back in on Tuesday, as I need it this weekend.
I do have the Ford E-350 owner's manual, but he wonders if Jayco made changes.

Anybody got any suggestions as to where I may get the fuse layout for my rig?

Thanks.
The only mods that JAYCO normally does is for items they add. The JAYCO manual would not have any of the chassis fuses listed in it, those would be in the FORD owners manual.
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Old 03-16-2023, 12:01 PM   #3
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This may help...

https://www.autogenius.info/ford-e-s...e-box-diagram/
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Old 03-16-2023, 12:46 PM   #4
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Thank you Marcm157. I forwarded that link to my mechanic. I hope it helps.
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Old 03-16-2023, 05:12 PM   #5
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Some Discrepancies

I compared the fuses from Auto Genius in the link that Marcm157 provided (which BTW, matches exactly with the owner's manual) with what is in the fuse box. I found some discrepancies.

In slot # 1, the manual calls for 20 amp, installed is a 15 amp.
In slot # 2, the manual calls for 15 amp, installed is a 20 amp.
In slot # 23, the manual calls for 20 amp, installed is a 15 amp.
In slot # 26, the manual calls for Not used, installed is a 5 amp.
In slot # 28, the manual calls for 25 amp, installed is a 20 amp.

Slot # 1: 4WABS or RABS module Not sure about those acronyms; any guesses?
Slot # 2: 4WABS relay (coil), RABS (diode/resistor), instrument cluster, warning chime
Slot # 23: Cigar lighter, data link connector
Slot # 26: Not used
Slot # 28: Instrument panel power point

I will be asking the PO if he knows anything about these discrepancies.
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Old 03-16-2023, 05:33 PM   #6
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4WABS:
4-WHEEL anti-lock brake system

RABS:
Rear anti-lock braking system

Murff
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Old 03-16-2023, 05:35 PM   #7
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4WABS:
4-WHEEL anti-lock brake system

RABS:
Rear anti-lock braking system

Murff
Exactly what I thought. Just wanted a second opinion.
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Old 03-16-2023, 05:43 PM   #8
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Originally Posted by SmokeyBear View Post
I will be asking the PO if he knows anything about these discrepancies
Probably every one of them.

The 5 amp in the unused might be one that JAYCO used for an add on. The only way to check would be to pull it and see what doesn't work, if anything.
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Old 03-16-2023, 07:28 PM   #9
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That 5 amp could be a USB charging circuit that was added circa 2010.
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Old 03-16-2023, 07:58 PM   #10
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Quote:
Originally Posted by SmokeyBear View Post
My 1997 Jayco Eagle on an E-350 chassis was at my mechanics to replace the cruise control servo module. Which, by the way, is almost unobtainable. I finally found a rebuilt one.

The new module was installed but then he found it was not getting the correct power. When checking the fuses, he found that his "guide" (I' will leave that to your interpretation.) did not match the fuses. One had a 15 where it should be a 25, and one did not have a fuse at all. So, he asked if I had a Jayco owner's manual. Again, unobtainable. Such is life with old rigs.

I'm scheduled to take it back in on Tuesday, as I need it this weekend.
I do have the Ford E-350 owner's manual, but he wonders if Jayco made changes.

Anybody got any suggestions as to where I may get the fuse layout for my rig?

Thanks.
Just for awareness, the size of the fuse specified is determined by how much current the circuit wiring can handle, using a lower amp fuse doesn't reduce the voltage on the circuit and make no difference to any components on that circuit as long as the fuse doesn't blow.

Point being is that if you have a 15a fuse where it says on the fuse panel to use a 25a, if the 15a fuse isn't blown then everything on that circuit is getting the correct voltage and will have the same voltage whether you use a 15a, 20a, 25a, etc. fuse.

I would ask him what exactly he means by "correct power".

btw, I think the E350's around the year of yours had one or two inline fuses going to the cruise control servo, inside the wiring harness near and below the brake booster that goes to the servo... that is somewhere he may want to check as well as the fuse panel. ~CA
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Old 03-17-2023, 08:48 AM   #11
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Yesterday I searched for E350 cruise control servo fuse, and for whatever reason (website cookies for tracking I believe), YouTube suggested this video which I watched seeing it wasn't that long. In any case, I suggest you (OP) watch this for awareness, what it says is that other servos may would work and cost a lot less $$$, just that you need to change out the mounting bracket. ~CA

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Old 03-17-2023, 11:53 AM   #12
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Quote:
Originally Posted by craigav View Post
Yesterday I searched for E350 cruise control servo fuse, and for whatever reason (website cookies for tracking I believe), YouTube suggested this video which I watched seeing it wasn't that long. In any case, I suggest you (OP) watch this for awareness, what it says is that other servos may would work and cost a lot less $$$, just that you need to change out the mounting bracket. ~CA
Yep, I saw that video long ago. I decided not to go that route because of two things: 1) It may work. 2) I am not much of a DIY guy unless I am certain I know what I'm doing.

Think about it. If I had tried that, and it still didn't work, what then? Throw up my hands in frustration, that's what. By turning it over to my mechanic, he knew just what to look for if it didn't work. I'll gladly pay for that.

In my original post, I said I already bought one, so your post is mute. It may be of value to somebody else who has this problem, though, and is more handy.
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Old 03-17-2023, 12:24 PM   #13
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Originally Posted by SmokeyBear View Post
Yep, I saw that video long ago. I decided not to go that route because of two things: 1) It may work. 2) I am not much of a DIY guy unless I am certain I know what I'm doing.

Think about it. If I had tried that, and it still didn't work, what then? Throw up my hands in frustration, that's what. By turning it over to my mechanic, he knew just what to look for if it didn't work. I'll gladly pay for that.

In my original post, I said I already bought one, so your post is mute. It may be of value to somebody else who has this problem, though, and is more handy.
Understood, my comment was stated purposely "for awareness" because I did read where you stated you already purchased a rebuilt servo. My reason for sharing is two fold, first being for others who may also need one perhaps now or in the future and cannot locate a replacement, as well for you if you ever needed another replacement sometime in the future. Many of our fellow RV'rs read these posts and search for issues similar to what they are encountering and could find what I shared very helpful.

I certainly don't disagree with you or with your point as I highly suggest for everyone to use a qualified mechanic for such repair services (any mechanical services) that they are not familiar with and\or don't have any desire to do themselves. ~CA
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Old 03-22-2023, 06:03 PM   #14
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An Update and Finish

I now have cruise control. The lack of power to the Cruise Control Servo Module weas traced down to a "secondary" cruise control shut-off switch on the master cylinder. It seems that years ago - keep in mind this is a 1997 model year E-350 - Ford did a recall on this switch because it tended to catch on fire, even while just sitting. This same switch was used in hundreds of thousands of Fords in that era. After a few years of fixing recalls, and replacing this switch with an updated one, Ford stopped making this switch. In short, it became unobtanium. Evidently the owner at that time did not take it in for the recall.

My mechanic did some fancy re-wiring to bypass that switch. Viola! Cruise control works.

This does not affect the "primary" cruise control switch which is part of the brake light switch. The cruise control still shuts off when the brake pedal is depressed.

My long-distance travels will now be much more enjoyable now that I don't have to keep the right foot on the accelerator pedal and constantly adjusting speed. Yes, I am spoiled.

Trouble is, I don't have any long-distance planned until May. If it ever stops raining long enough, I will probably take a short-distance trip just to use the cruise control.

I'm a happy camper again. Thank you everybody for your help.
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Old 03-23-2023, 05:53 AM   #15
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Quote:
Originally Posted by craigav View Post
Yesterday I searched for E350 cruise control servo fuse, and for whatever reason (website cookies for tracking I believe), YouTube suggested this video which I watched seeing it wasn't that long. In any case, I suggest you (OP) watch this for awareness, what it says is that other servos may would work and cost a lot less $$$, just that you need to change out the mounting bracket. ~CA

Very useful for future repairs, since finding an original is darn near impossible from the OP's findings. He got lucky and found a remanufactured one. Since he too states the mechanic found a switch to be faulty and not supplying the power needed for the servo module, My question is, was the servo module faulty in the first place? Perhaps the OP now has a spare servo module to put on the shelf.

As craigrv states, this type of information is extremely valuable for future owners having the same issue, and use the search tool on this forum to locate threads on it. I appreciate the effort any member takes to help out and post findings or alternative repair parts/methods. A valuable member does this.

I'll have a beer this weekend, and raise the glass as a tribute to those that go an extra step. My wife will ask why I'm raising my glass, but then realize why I do this every so often.
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Old 03-23-2023, 08:40 AM   #16
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My apologies for being so curt with craigav. Hindsight says that was not necessary nor appropriate. Next time I will think twice before posting.
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Old 03-23-2023, 09:21 AM   #17
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My apologies for being so curt with craigav. Hindsight says that was not necessary nor appropriate. Next time I will think twice before posting.
Thanks SmokeyBear, No worries, One thing I have noticed over the many years is that any issue(s) one has with their RV (or anything really) can be very frustrating (or perhaps simply not an enjoyable experience) for the one having the issue and I try to keep that in mind with my comments as well as when reading comments or replies from others. With that in mind, no apology was needed, but appreciated and I am happy for you that you are now able to cruise on down the highway. ~CA
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