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Old 05-22-2022, 11:46 AM   #1
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Flickering lights

2014 40qbh. Plugged into shore power. Power seems stable, but after an hour or so, my ceiling lights start to fade or flicker. Not quite used to the charger inverter settings yet. I have the shore power set to 50 amps. Any ideas? This is only our second trip with this rig.
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Old 05-22-2022, 12:05 PM   #2
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Disconnect all power from the coach. While doing so, feel if the shore power cord cap at the pedestal is warm or hot. If so, there’s you first clue.
Look for any discoloration of the prongs on the shore power cord cap.

Next, open the breaker panel and remove the breaker cover. Check every wife clamping screw for tight. Look around for burned wire insulation at the breakers and on the neutral bars.

Am assuming the lighting you speak of is 120vac lighting.

If 12VDC lighting - what do you do to get the lighting working again?
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Old 05-22-2022, 12:13 PM   #3
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Lights are 12VDC
Flickering suggest DC Voltage going down

Check to make sure House Batteries are being charged...
*Disconnect switch ON
*Inverter/charger DC Output...reset
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Old 05-22-2022, 03:09 PM   #4
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Originally Posted by MrMark52 View Post
Disconnect all power from the coach. While doing so, feel if the shore power cord cap at the pedestal is warm or hot. If so, there’s you first clue.

Look for any discoloration of the prongs on the shore power cord cap.



Next, open the breaker panel and remove the breaker cover. Check every wife clamping screw for tight. Look around for burned wire insulation at the breakers and on the neutral bars.



Am assuming the lighting you speak of is 120vac lighting.



If 12VDC lighting - what do you do to get the lighting working again?


I have been hitting the charger power switch twice, then they get brighter and stop flickering…
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Old 05-22-2022, 03:13 PM   #5
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I would be checking all the 12 volt wire connections between the convertor and batteries.
Be looking for corrosion or loose connection. Feel for warm terminations (which is a sign of corrosion in that connection).
You could have a week battery bank as well. Would surprise me if so on a 2019 coach, but . . . .
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Old 05-22-2022, 05:33 PM   #6
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I would be checking all the 12 volt wire connections between the convertor and batteries.
Be looking for corrosion or loose connection. Feel for warm terminations (which is a sign of corrosion in that connection).
You could have a week battery bank as well. Would surprise me if so on a 2019 coach, but . . . .


Well, it’s a 2014 coach but the battery codes show they are from 2019!
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Old 05-22-2022, 06:54 PM   #7
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We had that problem and found that it was the solenoid for the salesman switch going bad.. bypassed it for a while and then put a new on in.. our problem was solved.
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Old 05-23-2022, 08:04 AM   #8
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Our 2015 40 QBH did the same thing as well when we bought it in 2020. When I was in Tiffin Service in Red Bay, I was told that one of the lights is on the way out and just wait for it to die for replacement. For whatever reason, now that we have used the coach more, it hasn’t done it in a long long time.
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Old 05-23-2022, 08:09 AM   #9
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Sounds like you may have a converter that is on it last leg. Check voltage at battery with converter on and with converter off and see if you get a difference in voltage readings. You should be getting anywhere from 13.2 to 13.7 with the converter working appropriately.
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Old 05-29-2022, 08:52 PM   #10
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Click image for larger version

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ID:	366919 negative terminal on the bottom right battery. The terminal tab snapped right off!
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Old 05-30-2022, 06:15 AM   #11
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Quote:
Originally Posted by MrMark52 View Post
I would be checking all the 12 volt wire connections between the convertor and batteries.
Be looking for corrosion or loose connection. Feel for warm terminations (which is a sign of corrosion in that connection).
You could have a week battery bank as well. Would surprise me if so on a 2019 coach, but . . . .
Quote:
Originally Posted by kevinyeamans View Post
Attachment 366919 negative terminal on the bottom right battery. The terminal tab snapped right off!
Thar ‘ya go! 😀
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Old 06-07-2022, 03:59 PM   #12
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Originally Posted by kevinyeamans View Post
Attachment 366919 negative terminal on the bottom right battery. The terminal tab snapped right off!
I have to arrange my cables as I pull out or push in the tray. Otherwise they will snag on the battery hold-down rods.
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Old 06-07-2022, 04:23 PM   #13
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Check your ground connections in the inverter and fuse box. sounds like it may heat up and become unstable
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Old 06-08-2022, 08:34 AM   #14
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Check your ground connections in the inverter and fuse box. sounds like it may heat up and become unstable
Issue was resolved and solution provided - Post #10.
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