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Old 07-24-2012, 08:37 PM   #1
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Help With Lights Going Bright to Dim

Have two Duracell glass 12 volt batterys, 950 watt system in 36RE. Problem is lights keep cycleing bright to dim to bright etc. Have check all connections that can be found, insured fan on chargeing unit working and have found nothing that stops this, any one had this or know how to inprove or stop...
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Old 07-24-2012, 08:50 PM   #2
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Quote:
Originally Posted by Forbes
Have two Duracell glass 12 volt batterys, 950 watt system in 36RE. Problem is lights keep cycleing bright to dim to bright etc. Have check all connections that can be found, insured fan on chargeing unit working and have found nothing that stops this, any one had this or know how to inprove or stop...
Need to check converter.
What model and brand is it?
Need to load test batteries as well.
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Old 07-24-2012, 09:32 PM   #3
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The power converter is a WFCO WF-9845 a 45 amp unit. I have done a battery load test and they are fine. I will doing a output test on the WF-9845 tomorrow in day light. I think the unit might not be putting out high enough amperage when the lights are on in RV unit. It appears to be chargeing the batteries but not able to keep up with lights as will as battery charge. Does this make any sense at all or am I barking up wrong tree? I placed a good battery charger on batteries and turned off the converter and the diming stopped.
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Old 10-01-2012, 09:17 PM   #4
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Check the converter main wires. FR trims them so they fit into the converter and that cuts the amps.
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Old 10-01-2012, 10:31 PM   #5
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Quote:
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Have two Duracell glass 12 volt batterys, 950 watt system in 36RE. Problem is lights keep cycleing bright to dim to bright etc. Have check all connections that can be found, insured fan on chargeing unit working and have found nothing that stops this, any one had this or know how to inprove or stop...
You really need to connect a DC voltmeter to the battery posts and separatley to the converter output. It almost sounds as though the batteries are not connected to the converter output and DC bus. One of the prime reasons to maintain a battery in the coach is to smooth out the DC voltage mfg. by the converter, its not pure DC and battery cushions the output. The lights as you describe are swinging by at least 3-4 volts and this can damage electronic circuits in fans, refrigerator etc. The swing output of the conveter esp if connected to batteries is severe and can be caused by a defective voltage regulator circuit. Can usually be repaired but most on this forum reccommend get rid of bad WFCO converters for Progressive Dynamics, mine is neither. I would recommend stay with you battery charger and get the converter off the bus until repaired or replaced.
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Old 11-24-2012, 02:07 PM   #6
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I have a 2006--33 Ft 5th wheeler--Cedar Creek Silverbear 33LRLBS--50 amp system main breaker --my issue is the converter. I believe mine is burnt out. I have battery lights (new batteries installed about 4 months ago). Once connected to either 30 amp or 50 amp outlet my lights will not brighten up. I would like to know if only converter can be changed out or do I have to change out complete breaker system with converter unit combo? Please advise.
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Old 11-25-2012, 10:08 AM   #7
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Quote:
Originally Posted by Apache Dave
I have a 2006--33 Ft 5th wheeler--Cedar Creek Silverbear 33LRLBS--50 amp system main breaker --my issue is the converter. I believe mine is burnt out. I have battery lights (new batteries installed about 4 months ago). Once connected to either 30 amp or 50 amp outlet my lights will not brighten up. I would like to know if only converter can be changed out or do I have to change out complete breaker system with converter unit combo? Please advise.
Check the dc voltage at the battery out posts with a meter. W/o shore power should be ~12.4. With s/p should be 13.2+. Many converters but not all, are in the lower half of the power panel
Below circuit breakers. I don't think all style lights brighten with one volt increase. Anyway the v/m readings will tell.
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Old 01-06-2013, 01:45 PM   #8
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We just purchased an 07 Cedar Creek 34 SATS and did a three day stay at a new RV park near Shelton, Wa. We also noticed voltage variation and light dimming as well as furnace blower variation. During our stay we switched from 30A to 50A hookup and found that a lot of the variation went away untill the last day when the park was filling up for New Years week end. I appreciate all the above thoughts and will check out my charger system and battery. I was just wondering if anyone had used a surge protector/voltage regulator with good results?
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Old 01-06-2013, 02:18 PM   #9
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I believe most (if not all) of these issues can be solved by checking/cleaning your ground connections.

A corroded ground connection will cause havoc with your 12VDC system.
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Old 01-06-2013, 04:47 PM   #10
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Thanks for your quick reply. Seems to me that I had to clean up the grounds on my last fifth wheel. I will check them out.
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