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Old 09-06-2020, 08:25 PM   #1
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Troubleshooting Power Problem

I just installed a new ignition switch but I’m still experiencing a power problem.

I’m hearing an intermittent electrical hum, even with the ignition in the off position and the key removed. The sound seems to be coming from some sort of cylinder pump directly in front of the rear drivers side axle. The part doesn’t have any identification on it, but there’s a sticker warning me in 4 languages not to lubricate.

Any ideas on exactly what this pump is called and what it does? It’s mounted next to another unit that looks very similar.

There’s a hydrologic lift system as well as air brakes but I can’t really see how this element relates to either of these systems directly. Pile of manuals in front of me but I’m not figuring out what this is.

This is a 1991 Rockwood Class A Diesel Pusher. Spartan GM chasis.

Ignition switch thread: https://www.irv2.com/forums/f25/rv-w...ue-505035.html
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Old 09-06-2020, 08:56 PM   #2
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It might be an air dryer for the brakes. First I’m hearing of such a thing.
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Old 09-08-2020, 11:04 PM   #3
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After calling Spartan I learned that those are not part of the original chassis manufacture. They say it looks like an aftermarket hot water pump. I cut the red wire but it’s still making a sound for no apparent reason.
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Old 09-09-2020, 12:16 AM   #4
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It is not the motor next it?
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Old 09-09-2020, 07:10 AM   #5
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Can you tell where the hoses on that unit go? It may be a lift pump for fuel to the motor or generator. If you kill the chassis batteries does all the noise stop?
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Old 09-09-2020, 10:38 AM   #6
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Do you still have the eninge NOT shutting off problem?

Toggle the switch by the door you mentioned before. See what it controls.
Then disconnect the negative lead and all wires from the house batteries

Toggle the switch once again to see if that is now off or non functional.

During this there should be no shoreline or generator OR solar. If you have solar disconnect it.

Now try running and turning it off. If it continues to run start pulling fuses that seem to be related at first and then on to others.

There can be diodes in strange places that are supposed to prevent feedback but they can fail and cause issues. By removing the fuses you may at least isolate possible paths.

With this said, have you inspected every inch of the underside wiring that you can find? Some dirty rat could have sabotaged your wiring. Pack rats can really make a mess.

If you have a fuse panel somewhere near the rear area that sends power to the trailer hitch I would start right there pulling fuses.
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Old 09-10-2020, 01:08 AM   #7
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So I did have the problem; it went for almost 90 minutes. Very frustrating. We went down and looked at the engine area for a place where we might be able to shut it off; we jiggled a lever; not sure if this is it or if this correct. It cut out, not immediately, but shortly thereafter.
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Old 09-10-2020, 03:40 AM   #8
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Sure looks like the engine brake. Forcing it shut will stop the engine, but not what its supposed to do.

Time for a pro to come by and get things right.
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Old 09-10-2020, 03:03 PM   #9
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Did you do anything else before that? Such as pulling some fuses. Worst case one could disconnect the batteries I suppose.

However this engine is supposed to shut down?? Via a fuel pump shut off etc it has to be electrically controlled so pulling fuses may discover at least some common denominator..

Of course disconnecting batteries means both banks. I would remove the negative leads only. A large cutoff switch might remove the power but not always. Often there are bypass paths for critical power paths or heavy load paths.
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Old 09-11-2020, 10:26 PM   #10
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Quote:
Originally Posted by Piros1 View Post
It is not the motor next it?
The thing next to it does look like a motor. I finally got the noise to stop after cutting the wires. Cleaned it up and got better pictures. Im thinking its the hot water heater?
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Old 09-12-2020, 12:14 PM   #11
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Motoraide ???? The rv may have a heater core inside the coach to take heat from the engine when wanted. The pump might be some sort of circulation device??

Going back to post 7 for a second. Was that arm detached from the little lever pawl?? Or did you remove it??? Just curious. It does look like an exhaust brake.
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