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Old 05-21-2011, 08:41 PM   #1
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1978 28' Ambassador
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12V/110V lights

Have my plumbing issues under control thanks to so very helpful information from these forums now I am working on the electrical systems. I can not get the lights to work on 110 hook up. 12 volt they all work fine except the exterior lights. the outlets and AC work fine but no lights. Am I missing something?

Thanks,

Dave
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Old 05-21-2011, 08:51 PM   #2
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The lights inside the trailer are 12 volt lights. There should be no 120 volt lights, so if the lights don't, you have a 12 volt issue. Check your fuses, including the 50 amp negative fuse.
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Old 05-21-2011, 10:11 PM   #3
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There may be another 110V breaker box, on the opposite end of your trailer.
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Old 05-21-2011, 10:43 PM   #4
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chasing electricity

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Originally Posted by mohrjr View Post
Have my plumbing issues under control thanks to so very helpful information from these forums now I am working on the electrical systems. I can not get the lights to work on 110 hook up. 12 volt they all work fine except the exterior lights. the outlets and AC work fine but no lights. Am I missing something?

Thanks,

Dave
When it comes to electricitial problems I always thinking of chasing it. I would start with what you know. Get the old meter and see if you have 110. If you do have 110, then find the power converter. I hope I'm wrong but it sounds like the converter. Check the power going in, the if you have 110vac, then check it coming out. Depending on what type converter you have you should have around 13 volts vdc or a little better.
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Old 05-22-2011, 07:12 AM   #5
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Thanks for the help. I have checked all the fuses in the low voltage distribution panel with an ohm meter and all are ok. I also checked the power coming into 120 v breaker panel and the breakers and all seem to check out okay as far as I can tell. ( I'm no electrician but do have basic knoweledge) The AC power light does not light when on city power? The microwave, outlets and Air unit all work. I have no idea where the converter is located on our 1978 Ambassador rear bath unit. Any help is appreciated.
thanks,
Dave
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Old 05-22-2011, 07:23 AM   #6
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Like Terry said, the lights are all 12 volts. They run off the battery and converter. Many of the 70s have the converter in the bath area, in a closet or under near the tub. If it is the original, you should be able to hear it hum when it is working.
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Old 05-22-2011, 07:58 AM   #7
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Univolt

If it is the original Univolt it will be humming if there is 120 volt power to it. Look in storage areas like closets. It should be relatively close to the battery, I would think.
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Old 05-22-2011, 08:13 AM   #8
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Many of these trailers have shutoff switches for the converter. It may be near the front couch, or in the medicine cabinet. That still won't stop the 12 volt system from working until the battery goes dead, however. You DO have a battery installed in your trailer? It IS connected, and the terminals are clean?
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Old 05-22-2011, 09:36 AM   #9
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Thanks again, No humming anywhere, Yes the battery is connected and in good working condition. Could not find a shut off switch anywhere. I'll continue to look.
The battery hook up is in the front outside compartment by the LP tanks. The 12 volt distribution panel is in the front of the trailer behind the couch. The 110v breaker box is in the rear bath under and to the right of the sink. Should the converter be close to the 12v fuse panel in the front?

thanks

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Old 05-22-2011, 10:24 AM   #10
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In the later 70s they moved the battery up front...

There should be 2 large wires on the back of the 12volt distribution (fuse) panel. They should attach to the converter.
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Old 05-22-2011, 10:26 AM   #11
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On my 1979 Safari, the converter is in a compartment directly under the fuse panel.

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Originally Posted by mohrjr View Post
Thanks again, No humming anywhere, Yes the battery is connected and in good working condition. Could not find a shut off switch anywhere. I'll continue to look.
The battery hook up is in the front outside compartment by the LP tanks. The 12 volt distribution panel is in the front of the trailer behind the couch. The 110v breaker box is in the rear bath under and to the right of the sink. Should the converter be close to the 12v fuse panel in the front?

thanks

dave
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Old 05-22-2011, 11:12 AM   #12
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Well I found the converter! Looks like I will be taking the front bed out at some point. I will tackle this job at a later date. Thanks for all the help and feedback. Time to move on to the water heater.
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Old 05-22-2011, 11:47 PM   #13
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There's a light switch that turns on the univolt in mine, next to the 12V fuse panel above the univolt. But my 110V lights go out when the breaker in the rear trips.
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