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Old 07-06-2022, 11:57 AM   #1
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Short circuit in rooftop AC, tripping breaker

1998 Monaco Windsor.
Have two issues: first issue was getting a shock when touching the chassis when standing on concrete, found the power cord plug had an open ground connection.
The rear rooftop AC is putting 120VAC to ground ( hence the shock)
If I turn off the rear breaker to the AC the voltage on the chassis goes away, when I repair the open ground situation the breaker feeding the rear AC trips ( as it should) with no ground connection, the AC appears to run fine, but apparently has a short to ground somewhere, Still troubleshooting for the cause.
Wondering if someone out there has been down the same road?
Thanks!
Cam
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Old 07-06-2022, 12:46 PM   #2
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Have you or anyone else screwed anything to a wall or cabinet recently ?

Remove the AC cover and check the wiring in the juntion box.
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Old 07-06-2022, 01:27 PM   #3
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Nothing screwed to the wall lately but a good thought though!
Heading out there now, gonna disconnect the power at the junction box and see if the short is in the ac unit or the in wall wiring!
Thanks for the reply!
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Old 07-06-2022, 03:57 PM   #4
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Ok, problem resolved!
The run capacitor was pushing against one of the terminals of the control board,
Shorting 120vac to ground through the capacitors case. Insulated the capicitor with. Piece of thick plastic film and a piece of dialetric “ fish paper”.
No more voltage on the chassis. I have a new power cable end ordered to fix the floating ground issue!
Alls well that ends,
Cam
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Old 07-07-2022, 01:26 AM   #5
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Have read past posts where they found wire nuts fell off/ Romex connections in return duct, or where passing thru sheet metal had become bare. compressor internal ground also possible, but easy to test w/ meter. Wires burned off/ blown of bad capacitors also possible. Good Luck.
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Old 07-07-2022, 08:18 PM   #6
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The cap shouldn't ground out from outer case ,power wise except at the terminals. Replace it must be shorted and have lost capacitance ability as well.
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Old 07-07-2022, 11:09 PM   #7
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i DO SUSPECT YOU NEED A BETTER CLAMP.MOUNT FOR THE CAPACITOR AND MAYBE MOVE IT? Just insulating will not stop vibration from rubbing thru again, so consider moving capacitor or circuit board mount location?
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