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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 09-14-2019
ERWIN O ERWIN O is offline
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Default What is this for?

Took the couch and seating out of bus today
Under couch there is a black box. Opened it up and have no idea what it does. But would like to know so when it becomes a problem I know where it is.

Thanks
Erwin
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Old 09-14-2019
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Bill Pape Bill Pape is offline
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filters the power to some of the electronics such as radio, digital clocks etc.
careful those capacitors hold a charge and can bite you.
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Old 09-14-2019
ERWIN O ERWIN O is offline
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Bill
Thanks for the warning on the bite. I already assumed it was not a good idea to touch those. Funny thing is the radio in my bird buzzes like nobodies business. Follows the RPMs to a tee. Not the original Bluebird stereo. I suspect they did not wire to the proper circuit. The circuit that goes through that black box.

Thanks for the quick response. I am knee deep in the interior remodel and everyone’s help makes it so much easier and faster.

Erwin
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  #4  
Old 09-15-2019
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Gene Mehr Gene Mehr is offline
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I always thought that it was the flux capacitor.
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Marcia Mehr
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  #5  
Old 09-15-2019
ChrisRasman ChrisRasman is online now
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If that is a bank of filter capacitors one or more could be out of spec. Hard to say what that is filtering. Electrolytic capacitors do go bad and that is what they are 99%. Being in a hot coach in the summer, can kill them twice as fast. You have a diesel so your buzz can't be from the usual culprits. Spark pug wires, coil packs etc. The tach itself could be causing the buzz. Or the alternator? Might be a bad ground. Or a ground loop because something else has a loose or missing ground. You probably have an amp to the speakers like a lot of us do. I used to chase audio issues as part of a job I had putting in large scale intercoms in schools. One relatively easy thing to try is to put a filter on the DC power feed to the radio. If you have your blue box try to find the schematic for that part of the bus and see what it says about them.

https://www.crutchfield.com/S-bPaOis...33c6c762aa8d6f
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  #6  
Old 09-15-2019
wtom24 wtom24 is offline
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On my 88FC the filtered dc system is yellow-I think it is standard on all.
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  #7  
Old 09-15-2019
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hi erwin
you can have the cap checked at a tv/radio shop or just replace them it's easy while coach is under reconstruction
good luck with your build please take many pics along the way
mike
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