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Old 09-08-2015, 10:11 AM   #1
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Cruise control

I recently bought a 90 Overland motor home, Cat 3208 pusher. Not bad shape as old as it is, I am a mechanic ( retired) so know quite a bit about motor homes, my problem is does anyone have info on the cruise control system on these older units. When I first got it it worked fine, possible I have a wire come loose. Also has anyone experienced there speedo guage bouncing at low speeds, I think it is the speed sensor sender that is giving a false reading, even though I have had the guage just start bouncing like some kind of magnetic field IE bad alt Even though I have a new Alt on it, or wiring causing the problem.

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Old 09-08-2015, 10:37 AM   #2
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Location: Powell River, B.C.
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Welcome to iRV2.

Sorry I don't have any info to share on cruise control operation on your series of Cat.
But the speedo operation may be part of the problem, erratic signal from the speed sensor ( s ) may be the issue.
On my Allison 3060 series there are two sensors , on the drivers side, one on the bell-housing, second on the tailshaft , if that's what you have , maybe a clean up and reseating of the connections will help.

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Old 09-11-2015, 11:25 PM   #3
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I've had some older cars that when the speedo bounced at speeds, it was from dry cable inside the housing, but if you have an electronic speedometer, it would be from a speed sensor that may be going out or the grounds/connector pins needs cleaned due to bad contacts.

I would try some "Electronic Spray Cleaner" and disconnect all the connectors first and spray to clean off any electronic corrosion that builds up on electronic pins. Then I would smear some "Dielectric Grease" on the pin connections to help keep out moisture/corrosion.

If you can get to any grounding cables/wires I would take apart and wire brush/sandpaper away any rust to get a good clean surface contact. Just another something, to eliminate a possibility.

As to the cruise control, it can be broken wires inside the steering wheel column, a wire(s) that had become disconnected at the cruise control unit itself, blown fuse, vacuum diaphragm rubber cracked and won't hold vacuum, vacuum hose going to cruise control unit from engine disconnected or cracked and need replaced, Pull cable from cruise unit to carb/throttle arm popped off. Many things to look at, depending on the type of cruise unit model.

Sounds like something easy as the cruise worked recently, but going through the eliminate this/that does take time. Many times the hardest part is just finding where the factory put the part, to fix.
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cruise control

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